Another fantastic and educational video Peter thank you. I’m 47 years in the motor trade and not ashamed to admit I’ve learned a lot from CZcams and it’s by far the best educational training available.
I’m just finished watching Bernie Thompson from ATS. And that was a fair educational watch, I think CZcams is an awesome educational forum to have at our fingertips and free. Everyday is a school day Kevin 🙏🙏
Hi Peter, I watch and learn lots from CZcams, I really appreciate good mechanics like yourself taking the time to pass on your knowledge and findings. It helps us all. Cheers Matt
Another fantastic vid!! I've learnt so much over the past year or so from your skyactiv videos.. I have a 2017 6 that was running rough a few weeks after buying it but your videos have been great for diagnosis.. I will eventually do a full intake carbon clean if I ever have the free time.. typical I lived and worked in Waterford for 15 years and now I'm back in Dublin I find a proper mechanic down there 🙄 I deffo would prefer dropping the car into you rather than trying to explain to someone up here what I need done
I think you may be referring to comments in the last video!!! Like we discussed previously there is only one EGR valve. It is called EGR sensor A for good reason and yes there is an EGR B circuit. The cooler bypass valve is there for it’s own purpose. It is not used as a method to heat up the engine on startup. Most manufacturers using a Diesel engine from 2012 and almost everything from 2015 have a method of bypassing the EGR cooler. Whilst the EGR cooler is bypassed, this is not a secondary method of EGR. I have worked for Mazda for many years and know the Skyactiv system inside out. I couldn’t type it all out I may do a video on it, but basically the valves work together in conjunction to create volatility and reduce boost charge pressures at certain times when the EGR B circuit is activated.
Every other egr set up I have encountered have as you explained a method of by passing the egr cooler but always a vacuum controlled flap just to direct exhaust flow through the cooler or not, on the one egr pathway. But isn’t it great to be interrogating our thought process like this. A video would be fantastic, I look forward to it. And thanks again for taking the time to explain your thoughts on it. I love it 🙏🙏🙏👍
Good comment lads but how do some diesel engines produce more carbon deposit than other engines which causes more egr related problems causing more headache
@@johnbarry5368 what my thoughts on this engine design is that they have 2 high pressure egr valves which in theory have the ability to allow twice as much unfiltered exhaust gas direct from exhaust port / exhaust manifold into the intake manifold. This I believe could cause twice as much carbon buildup 🤔 Let me know what you think 🤷🏼♂️
@@kennedysgarage3281 yes I'd have to agree with you it's a good idea but when them engines have a couple of miles on them carbon builds up fast then take in to account oil changes 10k kms is more than enough but people usually run over that and city driving is more strain on the system anyway diesel engines with thermo systems as in thermo plungers seems to produce less carbon
Always a good watch ..could watch you all day on cars very knowledgeable ....may i ask in yoir opinion what wouod be a main cause of thermostat not opening much /barely ? Btw its a new oem intsalled with wiggie at the top ..2 new oem in 6 month to be sure , core bypassed 4 now cheers ..ive got the control valve here a 2nd ..im apmost sure mine dont open properly ..maybe why my cooler was so caked/blocked plus the odd groan noise ..ill ciran it up this week amd try it cheers in advance peter
Interesting to hear you thinking out loud here Peter. I admire you for being so open and honest rather than hiding in case you say something that might not be 100% correct. None of us knows everything and your honesty might help us all to learn. I’m inclined to agree that both these valves are EGR valves regardless of what Mazda care to call them. Each has the ability to regulate EGR flow, one a flow of cooled EGR gas and the other the flow of non-cooled EGR gas just as you say. I’m guessing the design might be an attempt to further reduce NOx but from a simplistic and slightly cynical point of view they’ve got a system with two valves which are a common failure item on almost every diesel vehicle (so twice the chance of problems) and a machine that seems to be very efficient at creating high volumes of carbon and throttling itself to death! If @arsautos9797 does produce a video then I’d be keen to see that and gain a further understanding of this system design. (Maybe you could put a link here if that happens?) Nice Dave Sterl Polo shirt btw; I don’t have one of them! 😉😉😜
😂😂I like Dave, he is a very intelligent fella & knows a lot about a lot. He has called down to us for a night & we also met up at a trade show in Dublin. I will put up a link if the video comes & thanks for watching & commenting, I very much appreciate it 🙏🙏
What you are doing here is a rare occurrence in the automotive field, you are testing and experimenting on a system to gather some data. just the act of doing this puts you in a very select group of people. On top of this you are filming it and showing it to us. Thank you.
I am by no means a bright spark, so I’m trying to educate myself & hopefully it will help someone else out 🤷🏼♂️ I’m enjoying the crack doing it too, some very good & invested tech’s out there. Thank you very much for watching & commenting on some of my stuff, I very much appreciate it Mr. Blonde 🙏🙏🙏👍
The SH-VPTR engine - 2.2 SkyActiv Turbo Diesel uses what Mazda refers to as VVL - Variable Exhaust Valve Lifting. The exhaust camshaft opens the exhaust valves slightly during the intake phase to allow hot exhaust gases to recirculate to the intake and warm up the engine faster especially during cold morning starts. I guess that is done through the EGR intercooler bypass. But once the engine is hot enough the hot exhaust gas is no longer needed so I guess the valve is shut off and all other recirculation has to go through the intercooler since cooler air is better for combustion. This is just my opinion, I could be wrong.
Another outstanding video Peter…Nothing can ever be stupid when there is learning taking place and this video, as with all your videos are filled to the brim with extremely useful insights and education. These engines are just fascinating. I’ve picked up a 142 Mazda 6 project..I was told it had a knocking noise but on delivery and an oil change it’s running as sweet as a bird (had hoped it had eaten itself 😂 - very disappointing 🤣) but will do all the Preventative Maintenance on it just in case…. You mentioned you felt one “EGR” was to help speed up engine warm up..have you noticed how sometimes these engine go to about 1750rpm at cold start (normally) and run that way for maybe 20 seconds…would that theory also apply..I haven’t come across another car to do that and I always thought an engine is best kept to low revs on cold to allow the metals to expand slowly…. 🤷🏻
I have been noticing that on all the Skyactive’s but didn’t know what it was until another commenter explained it is called AWS (accelerated warm-up system). I think it’s amazing what can be learnt by doing this. And your possibly worse than me for wanting hardship 😂😂 But it is a nice bonus to not have to rip the engine apart, thanks Damien 😉😉
Being prone to build up carbon doesn't mean the car is bad but it's because they are truly reducing emissions as much as possible. It's a result of the EGR system that cycles the gasses again in the engine for full combustion and thus reducing of nitrogen oxides. The result is increased carbon buildup which requires more frequent cleaning. Without the EGR, there would be way less carbon over time but the car would pollute the air more.
Well explained, quite a simple process but a lot of people don’t understand it like you. This engine design has 3 means of exhaust gas recirculation, lots of carbon 😬😬😬
Very interesting as we run a fleet of fiat ambulances that lads call low pressure and high pressure egrs but never made sense like your saying there are both egr just one is used with a cooler for temperature every day is a learning day
Mazda Skyactive is the only 1 I have seen this type of system on though. Your fiat’s might have a high & low pressure egr’s. Low pressure egr will be taken further down the exhaust system with a throttle flap on the exhaust itself to create back pressure when needed to aid low pressure egr flow. If that makes sense 🤔🤔
Hi ill have a look at exhaust see if flap is in exhaust today as a lad at work has engine out of one he is putting new engine in as have been looking at the egr system on his engine and is different setup too mazda
Hi, massive thanks for doing these videos, once you do the the removal and cleaning of egr and inlet, does it need reprogramming? Also are these really that bad of an engine or just bad at causing carbon? Thanks
Sometimes they need air flow meter resets but not in all cases. I don’t think they are that bad they just have a bad reputation from people not able to or wanting to fix them correctly 🤔🤔👍
Hello Peter, thank you for helpful videos. I was wondering if your location is near London. My 2016 Mazda6 engine oil warning light came on. I would have loved you to check it out Thanks, Joe
Unfortunately Joe i am in Ireland 🇮🇪. But you should be able to find some close by finger’s crossed 🤞. Your problem is most likely to be injector washers after failing & blocking the oil strainer in the oil sump 😬
Fantastic video very informative can I ask a question about the "2" egr set up ...why is gas put thru a cooler and one direct from the engine is this why these engine coke up with carbon so easily is it worth blanking off the cooler side as in my opinion this is why you get so much build up hot and cold gasses mixing and sludging up
Egr gas is used to reduce cylinder temperature ( no oxygen = less heat ) colder exhaust gas reduces temperature more efficiently. Some car manufacturers tried only low pressure egr but reverted back 🤷🏼♂️🤷🏼♂️ I try not to over think these things & repair the faults as they occur. The carbon is caused by egr, but is it a necessary evil in modern engines 🤔🤔
@@kennedysgarage3281 so can I ask how do I reduce the build up in my cx5 2.2d I use good fuel drive hard regular ...been told to blank off egr and get it mapped out of the software
@@micktriplow1184 that is one option but personally I don’t like deleting software from engine ECU’s The 2nd option is just to do as the service schedule recommends & clean the intake manifold and ports every 100,000 kms. It isn’t that big of a job just that everyone try’s to avoid doing it. It just doesn’t make sense to me 🤷🏼♂️🤷🏼♂️
Hello mate, just wondering if you know any decent garages which have as much knowledge as you over in North West England? Had the EGR blanked off as dealers wanted £800 just for the part, and got recommended from garages to just blank it off and after already spending quite a bit having it carbon cleaned etc was beginning to lose hope. Anyhow, it has been blanked off and car seems to run decently, however when I scan with my cheap OBD reader it states the injector test fails, no faults or anything on the dash and seems to run decent, bit of smoke on startup but runs fine after. Just after a decent garage which have good knowledge of the Mazda 6 and it's issues as you do, I know a good one for my Insignia but struggling to find a solid one for the Mazda.
Unfortunately I don’t know any garages in North west England. Most garages try to avoid Mazda for some strange reason 🤷🏼♂️ What part was €800 that made you block the egr system?? I don’t believe in blocking off or deleting anything in cars. Just fix them, but unfortunately this isn’t achievable for everyone 😬
Hi, very good video. Can you tell me please how much do you charge for this type of carbon cleaning (egr, manifold)? Also where is MAP sensor? Can not find it. Thank you
Hi Peter, have you ever seen the High pressure pump giving bother in these. I've a cx5 crank no start. No codes coming up but I've no fuel pressure on live data. Filter has been replaced. I've no gauge to read the actual fuel pressure at the pump.
I have never encountered a high pressure fuel pump problem but that’s not to say that they don’t fail. Do you definitely have low pressure fuel delivery getting to the pump ??
Nice one Peter, tho exhaust gases cool the engine as opposed to heat it. I use the thought process of what would happen when you add an inert gas along with the fuel and air. Is why i do not recommend or condone blanking. I think you may be testing Cunningham's law here.
Absolutely correct at normal operating temperatures Dave. Egr reduces nox & cylinder temperature above around 1800 degrees. But some engine designs & manufacturers use exhaust gas on cold engine start up, they introduce a small percentage of warmer air only on cold start. But it is a fine line between increasing & reducing thermal management/cold start friction. But I only read this crack and every day is a school day for me, I don’t know who Cunningham is 🤷🏼♂️😂😂😂
Would you recommend a chemical carbon cleaning for the 2.2 Skyactive D? It’s more common here in Dublin and just wondering if it will help with the carbon buildups on these engines.
In my experience I don’t believe any carbon clean will remove this amount of carbon. Just my opinion though. It cost around 6 to 7 hundred to do it correctly 🤔🤔
I can show anyone who cares the same vehicle running with active EGR & Inactive EGR so you can see the difference. With active EGR, the vehicle will be down on power, throttle response will be slower, fuel economy will be far poorer. The engine will be far "woolier". That is with a perfectly working EGR system. No faults. With Inactive EGR, power will be up, throttle response will be much snappier, fuel economy will be far greater. Plus the engine is now not drowning in carbon deposits that rapidly build up, making the EGR issue even worse. Caveat is that the average ECU will take almost 100 miles of driving before the ECU adapts to running inactive EGR, but once it adapts the difference is night & day. Ignoring these GDI engines & jumping across to TDI engines - but it applies to both - a TDI will run so much more economically with inactive EGR that it is comical - EGR active, average runs high fourties MPG, there or there abouts - EGR inactive and no other change whatsoever, mileage jumps to high 60's, into the 70's & if you know what you're doing, know what other junk to delete, you hit a handy 100mpg from that yoke that was struggling to do 50 last week. Pretty much. The MPG computer on my own personal car usually returns ------ as the figure is deemed "Implausible" by the ECU.. I sulk if it does less than a consistent 70-80 mpg. 100 is nothing rare, EGR is daft tech.
and it always was - since its first inceptions. I started binning these systems for people decades ago & the difference was always immediate. That & fuel trims - factory fuel trims - since back when it was set using nuts & bolts - were always "This is the middle ground!" - since forever. They were never set up for peak economy, or for peak safe power, they were always set at some wooly middle-ground nowhere land with acres of room for improvement either side of the factory setting. Neither very economical nor very powerful - but "Safe" was always the factory aim - which usually translated as "Crap" in real world driving - and not much has changed. There are better settings - always.
😂😂😂you ran out of room on the 1st page. I really don’t like them either but all types of deleting are coming to an end in the next few years. The NCT & MOT’s have to measure ‘NOX parts per. million’ & Dpf / Egr deleted vehicles could be rendered off the road 😬 It has just been introduced in Germany & the Netherlands. But a very well explained reply 👏👏👏💪
Hi Peter, it's very interesting to watch and learn from your videos, thank you because of that! I own Mazda with this kind of engine and can You tell me why is my turbos inlet pressure too high (over 150 with full throtle and when released drops and stays at 96) it should be between 0-100kPa?? And at the same time my exhaust sensor is reading pressure over 300kPa when it should be between 0-150kPa. Thank you very much Stipe Petrović, Croatia PS: I forgot to mention that I recently cleaned intake manifold, checked all pipes and clean MAS souch as exhaust sensor
I’m assuming that the only reason you think that they are too high is due to your scantool data going ‘red’ and above the desired value ??? If so your car is correct and it is the scantool wrong. It seems to be quite a common issue with Launch & Autel. I talk about this on my latest mazda video, I’ll copy and paste it. Let me know if this helps 🤔
Yes, scantool shows me info above recommended values and if I push car little bit harder, it turns on DSC, TPMS, ABS mistakes and goes into "safe mode" (turbo off) sometimes "check engine" but not every time. This is happenig only when I drove it in high RPM-s
@@struja008 did you see in the video I pasted how high my readings go ?? The only reason you are getting SCBS & ABS faults are due to ‘Invalid data received from ECM/PCM. (Engine/Powertrain control module) So you will have some fault codes stored in the ECM after those warning lights illuminate. If not then as in the video I paste someone was playing with the software 🤔🤔
Hi, I think that I have solved this problem, no more warning light or safe mode!! I just clean sensor pressure exaust pipe (with thin steel cable), reset the sensor via diagnostic tool and so far car is running well no matter how I drive it. Thank you one more time
The title was "why do they build up so much carbon". Was there an answer please? I understood that Mazda ran the engine hotter to reduce carbon build up- maybe that mechanism is as simple as the EGR bypass valve without cooling?
Yes, the answer is quite simple Mazda’s engine & emissions design it to use a lot of exhaust gas recirculation. This exhaust gas is good for emissions output but bad for intake manifold blocking with carbon from that exhaust particulate. The should be cleaned every 100,000 kms or so. Does that make sense??
I always believed that it was Renaults job to reinvent the wheel in the car world 😂 we all know one egr valve is enough headache never mind two 🤦♂️ thanks for taking time out to share this, just seeing the manifold stripped so we could see the exact route of the gasses 👍 whereabouts in Ireland are you based?
@@kennedysgarage3281 brother in law has moved to Ireland he lives in loughmore. Although I have never been I have funded the miss’s a few times now for her visits. She loves it there my wallet doesn’t 😂 she was there for a long weekend Thursday till Sunday. She has visited Waterford to some crystal tour. Stay bright 👍
@@johndutton2895 let me know the next time ye are over & coming down south, my wife has an Airbnb. ‘Bee cottage on the greenway’ some pretty cool mountain scenery & hikes to do there 😉😉👍
Peter, hope you can help me here as you are probably the most knowledgeable CX5 repairer on CZcams! My 2016 CX5 2.2d Skyactiv has been in for a walnut blast back in 2019 which was before I owned the vehicle due to Intake Manifold soot accumulation. The car has done around 50k miles since then, a lot of motorway drives where the engine has ran at optimal temperatures and when the missus drives it definitely gets redlined lol. My car has just gone in today for a 2nd time to be walnut blasted due to soot accumulation, this is quite a costly repair. Could the soot buildup be prevented by blanking the EGR valve off like older diesel models and having it mapped out? I can’t be forking out over £2k every 3 years, it’s baffling how so much soot actually accumulates on the air intake, my only guess is that it is from the EGR? Thanks, Sean
Hi Sean, these Skyactive engines run very large quantities of Exhaust gas recirculation to reduce emissions output. This does cause the intake manifolds to block. 50k miles is very early for it to be needed again though, watch because you might have another issue. (ie. Exhaust camshaft worn or exhaust pressure sensor A & pipe😬😬) The egr system could be deleted & blanked but I find it plays havoc with cars for future repairs, they never really tell the whole story when interrogating with Scantools afterwards 🤷🏼♂️🤷🏼♂️🤷🏼♂️ But they are only my thoughts 🤔🤔 I am delighted you like some of my content though 🙏🙏🙏
@@kennedysgarage3281Hi Peter, I also have one that needs a second de-carbon after doing an additional 43,000 km since the first de-carbon at 70,000 km. Mazda dealer charges €900 for this. In the intervening period they also replaced throttle body and exhaust pressure sensor. I’m concerned that getting the de-carbon done again could be a waste of money. What are your thoughts? Thanks.
@@johnflavin1602 I have seen them to but up quite a bit of carbon in 40 to 50k but it shouldn’t be enough to cause any air restriction. Are you sure that is causing you problem ??? Would you chance cleaning it yourself 🤔🤔
@@kennedysgarage3281 Thanks for replying Peter. I’m only going by what the Mazda dealer is telling me as I’m not mechanically minded. The last service showed the P0101 fault and the dealer is saying it needs another de-carbon. Car runs ok but keeps going into limp mode on a long journey e.g. Cork to Waterford. If I stop and restart the engine, full power usually comes back. When the car is stopped it’s ticking over roughly in that every 10 seconds or so it seems to gasp for air and the revs go down for a split second and then it returns to normal. It doesn’t do this gasping thing all the time but most of the time. I’m in Cork but have connections to Waterford so would want you to look at it sometime if possible. You’re probably inundated with Mazdas now from all over the country.
Hi Peter The Egr Bypass is used as part of the AWS system (Accelerated Warm-up System) The high reves you hear at the cold start of the engine. It may have other function also. PS the video dosen't really explain why there is (so much carbon built up) . I think the carbon build up is because sinply the EGR systen is so good which is inversely so bad for the engine. I have Mazda 3 and I take off the Manifold every 50k and clean the whole engine . Alos use Mazda DPF oil and that will sort out the issues with the oil galaries and bottom end , chain and oil pick up. Ps love your work .
I have never heard of AWS but have heard the engines run at high idle on cold start. So I googled it, very cool. I believe the carbon buildup comes from what I call ‘ the 2 egr valves’ or egr valve & egr cooler bypass, unfiltered exhaust carbon deposits. Double entry passages = double the carbon. Low pressure egr systems pass through the Dpf first which filters that exhaust gas. It’s all very thought provoking 🙂🙂😉
Hi maybe You know if Mazda use good torque settings for the new silver washers of injectors. In service manual is finger tight 2 nm and -90° and the other one finger, 2nm and 270° if i good remember. Maybe this is inproper tightening. Why the engines has so much problems?
Your torque settings are the same as the torque settings I have on Autodata. Another commenter did say they had changed but I could never find them or he didn’t share them. I usually give my own little squeeze at the end if I feel it is needed 😬😬👍
Hi, also just wondering if you know any decent garages which have as much knowledge as you over in London or near East London? Looking to get the EGR and Manifold cleaned out by having them taken off. Car is throwing 2 error codes which are P0401:00-64 AND P0101:00-64 Thanks
I’m not familiar with any garages in London but I am part of The Dpf doctor network, so there might be a reputable member in London . Just search the Dpf doctor in your area. Both of these faults will be more than likely fixed with the intake manifold & port clean. Let me know if and when you find someone 👍
I just bought a Mazda cx-50 non turbo due to hearing good things with reliability and the fact they do not use CVT transmissions. Did I make a mistake?
I don’t believe so, most car owners think that if they change the oil & filter every 10,000 mls that it is comprehensively maintained but just follow the manufacturer’s service schedules. The schedule also changes annually as they see faults arise. A very nice car you bought 💪💪👍👍
I cannot say 100%, but my thoughts are that no. Additives don’t really help, these engines run large quantities of exhaust gas recirculation which inevitably creates carbon buildup. Which means the intake system must be cleaned every 100,000 kms. Hopefully this helps 🙏🙏
Hi, I have a 2013 2.2l Skyactive diesel that has been identified with the leaking injector 4 issue you have have helpfully described previously. There has been no engine error light but it developed the chuff chuff noise (which is why I took if immediately to my usual garage). They noticed the filthy engine oil and then identified the leaky injector valve. Can you give me an indicate of what engine damage may have occurred and if it is worth getting it looked at for repair?
As described, the leaking injector will build up carbon in the crankcase. Which in turn can build up in the oil strainer and cause oil pressure problems. I would advise getting the injectors removed & new Mazda upgraded washers fitted. Then if possible remove the sump and replace the oil strainer, it will cost an additional 5 or 6 hundred but well worth it. Once this is done there are no other related issues 👍
@@kennedysgarage3281 Are leaking injector washers usually evident by visible carbon deposits around the injectors on the top of the engine? Looked at mine today in situ, looks clean. Regularly serviced, 2014, 45k miles, low annual mileage, so hopefully some way off the clogged up inlet scenario...but guess those crappy copper washers could give up at any mileage? Maybe worth having done if not too expensive; I do like the car.
@@kennedysgarage3281 Thanks for the clarification. Thought I'd seen another video where there was external carbon build up, that was probably a very extreme/long term leak. Mazda put some nasty hidden faults in this engine (injector seals, excess EGR volumes and the DPF regen). I will get a quote from my local garage, they did highlight new seals as a pre-emptive action. I looked at the top of my injectors, all clean...but clearly that doesn't mean much at all. Really appreciate all your responses 🙏.
Yes Eoghan, it is the most common cause of it. But as I have learnt it can also be caused a worn exhaust camshaft & or hydraulic tappets failing. These yokes can be expensive to get right 😬😬
Hi! I'm in france. I have a 2017 2.2 175 ch. I have a low oil pressure warning light, but I have no leaks at the injectors, no carbon deposits. The camshafts are damaged (known problem). What do you see as solutions? Would an oil change and oil filter fix the problem? Cordially
Hi Peter, I have a mazda 6 2.2 skyactiv-d which I have just bought on a 2014. Its now back where I bought it as when driving it home I had no power at around 3000 rpm under that it had plenty of power. They have had the car two weeks and still can not work out what is wrong with the car..? I also found at the same revs it started to judder quite badly but then stopped doing it but again no power around the same revs 3000 rpm. Do you or anyone else have an idea as to what may be causing this problem please.. ? Cheers Alan
I would assume that it had gone into ‘limp home mode’ which won’t allow your car engine to rev. The intake manifold & intake ports blocking is the most common issue with the Skyactive engine. Unfortunately without seeing the vehicle I’m only guessing, but well worth a look 👀 🤔 Ask them what fault codes they have ?? It might help 😉
@@kennedysgarage3281 Good morning Peter, Thank you massively for responding and giving me your thoughts. There was nothing on the dashboard to suggest its gone into limp mode not one warning light at all. I'll be asking them to check what you have suggested. Once again appreciated. If I was anywhere near you the car would be with you belive me. Love your videos and detail you go into them with...👌👍
Hi Peter, I have the same Mazda and I have a problem with the smoke, I have already changed the new DPF and I check all the injectors and I even did a complete oil change the smoke and a little gray white I have no problem with overheating the car runs perfectly without any fault except the smoke help me please
@@kennedysgarage3281 Do you have a precise idea because I really checked everything except the turbo. and what exact turbo is broken. do you have a video regarding this failure? Please help
@@talalazad2932 it really is like telling a doctor that you feel pain & asking how he can fix it 🤔🤔 Without seeing your car it is like impossible for me to pinpoint a problem for you. I will copy a paste a turbo replacement video that shows me checking the small turbo, it might help 🤞🤞 You hardly live in Ireland ??
@@kennedysgarage3281 I've been thinking about it, I only had the info of 1 man/women on CZcams. But it would make sense, I reckon it'll be 10,000k's Japan not the UK/IRE 20,000K's 12,500 miles. Some mechanics service there own cars every 5k miles so that makes more sense, 8k or 10k's Japan schedule, doesn't make sense other that to create inbuilt obsellecance for our UK schedules. SkyActive tech just means lightweight, G for Petrol, and D for DieselyWeazily. Bet you'll know that lightweight nomenclature , lovely to drive Maz6, over light-weight over engineered things break , filters block, carbonised. 3 Main faults I know of I know of ( 3.5 faults ) 1.DPF causing oil dilution 2.Injector's causing oil dilution ( strangling coking up ) 3Overheating from , well, everything inc the above Exhaust Temp sensor was recalled and made Metal Shame they're so nice drive and beautifully styled and I like the tech ( engine ); to drive I get hit with a big STICK every time I dip my toes in with a below below trade book Sky-D !!! The petrols are way over top clean book, so cannot win
Hey Steven, some people do EGR delete but in my opinion don’t do it 😬😬 The intake manifold will block around every 100,000 kms. No worse than a timing belt on Volkswagen or Audi. Just my opinion though 🤷🏼♂️🤷🏼♂️
@@kennedysgarage3281 Does regular change of oil reduce built up? Oil has been changed every 6k-8k and has 99k Km. What I actually can observe that it needs a 10 minutes to warm up so that blue light disappear (even at the 15 C), does that means that I have carbon built up or ? I would really appreciate
@@sull5307 intake manifold carbon buildup cannot be avoided. But if the injector washers are leaking and over time going to build up carbon in the crankcase and block the oil strainer, well regular oil changes will help to avoid the strainer blocking as fast. Replacing the injector washers and strainer is the best approach though 😉👍👍👍
@@kennedysgarage3281 i read that these engines needs to warm up little bit more than other during start up, so I am not alone. Concerning the other issues, I really don’t have any up to now, but yes, I will do carbon cleaning as you suggest, seems like the best approach for keeping my engine in best condition. How I can detect if I have problem with injectors? Also car was serviced in the certified mazda dealer so I guess everything should be okay
Hi Peter, i have excessive regens at approximately every 30-60 miles and rough idle and poor low engine speed acceleration and rough gear change from first to second. I do not have any DTCs, however, when plugging in a scanner EGR A is showing a 99% error. Is it likely the EGR is stuck open and is causing the excessive regens and poor running? I've already had the intake walnut blasted which temporarily improved the low end acceleration but not the regens, but i don't think the mechanic cleaned both EGRs or the EGR cooler. I'm considering getting the EGR blanked and deleted (the blank due to the valve not closing). Is it even possible to blank this system?
It is a worn exhaust camshaft & possibly hydraulic tappets causing excessive particulate (soot) in the exhaust & forcing frequent regenerations. Are you in Ireland??
I’m not sadly, although based on your videos I’m half tempted to drive the car over. When I unplug the egr valves the response and smoothness of the car is much better until the limp mode kicks in. How long should a camshaft change take a garage give or take? Many thanks
@@christianhillier5640 it will take around 8 hours to replace the exhaust camshaft, it will be necessary to check the hydraulic tappets underneath it too as these can get quieter after the egr valve is disconnected 😉
Thank you so much Peter. Called a garage to suggest it might be the camshaft and they say ‘no it’s probably your timing chain, camshafts are rare’. It’s like banging your head against a brick wall.
I have 5 in my garage,one wit a broken oil pump chain and other wit oil light flickering on,ld say the pick up is half booked because of the injectors leaking… a shit box they are
I do agree, if only the chain & gauze is done before they fail it could save a lot of them 🤔🤔 Are you in Ireland or England, I could do with a few bad engines
@@kennedysgarage3281 in Dublin but don’t have any engines,Donny engineering would have bits for them but I don’t think they are very helpful.Yep I tuck the sump down and the pick up is blocked🙄I have the pick up on but I’m in two minds will I do the oil pump chain 🤫hard to get staff, Nobody wants to be in Mechanic anymore I don’t blame them😂Land Rover engines are given a lot of trouble as well
@@ccbanger1414 feel to see how loss the chain is in the middle of the oil pump sprocket, if loose better to replace it. Split the chain and turn the engine, might make it easier. It’s a nightmare getting staff now whatever is going on 🤷🏼♂️ The landRovers are very troublesome 😬😬
It's 2023 and mazda has gone backwards instead of progressing. Audi and Toyota solved the carbon issue with adding port injection, but not Mazda, noooo too difficult and costly for them!
@kennedysgarage3281 I meant on their petrol engines. Audi/VW & toyota have added port injectiors to all their GDI engines since 2018 onwards. No more carbon buildup problems on their peteol engines. But mazda seems reluctant to add simple port injection because they don't want their cars to last longer than the warrany period.
@kennedysgarage3281 That's true, but mazda seem so keen on making their cars that don't last at all. You take the undercarriage coating that is nonexistent. I have seen brand new mazdas that have badly rusted. Mazda has done lots of shortcuts that make no sense. The sheet thickness used in the body is not even 1mm. Where I live, mazdas depreciate like there is no tomorrow. Why? Because here people buy cars to last, and Mazda isn't a car that lasts.
Another fantastic and educational video Peter thank you. I’m 47 years in the motor trade and not ashamed to admit I’ve learned a lot from CZcams and it’s by far the best educational training available.
I’m just finished watching Bernie Thompson from ATS. And that was a fair educational watch, I think CZcams is an awesome educational forum to have at our fingertips and free. Everyday is a school day Kevin 🙏🙏
Hi Peter, I watch and learn lots from CZcams, I really appreciate good mechanics like yourself taking the time to pass on your knowledge and findings. It helps us all. Cheers Matt
Have you ever found that recording yourself makes you a bit more critical & comprehensive. And in the long run makes us better 😬😬
Cheers Matt 🙏👍
You certainly have helped me thank you very much and happy Christmas 🎄
Thank you Steve & many happy returns 🙏🙏🎄🎄
Think you did a top job with this video , your skill and knowledge and willingness to share are much appreciated ,
Fair play to you, hopefully help you out someday 🤞👍👍👍
All knowledge shared is appreciated, as you say every day is a school day 👍🏻👍🏻
Too right Peter, something new to learn everyday 🙏🙏👍
Another fantastic vid!! I've learnt so much over the past year or so from your skyactiv videos.. I have a 2017 6 that was running rough a few weeks after buying it but your videos have been great for diagnosis.. I will eventually do a full intake carbon clean if I ever have the free time.. typical I lived and worked in Waterford for 15 years and now I'm back in Dublin I find a proper mechanic down there 🙄 I deffo would prefer dropping the car into you rather than trying to explain to someone up here what I need done
Hi Keith, I do lots of Mazda’s for people all over Ireland & especially Dublin, so yes anytime you need help just let me know 🙏🙏👍
Good video. Good explanation. Cheers 😊
Handy to know the system layout Trevor 😉😉
I love mazda 2,2 :) never had so much problems :)
Aren’t they great 😊 👍👍👍
I think you may be referring to comments in the last video!!! Like we discussed previously there is only one EGR valve. It is called EGR sensor A for good reason and yes there is an EGR B circuit.
The cooler bypass valve is there for it’s own purpose.
It is not used as a method to heat up the engine on startup.
Most manufacturers using a Diesel engine from 2012 and almost everything from 2015 have a method of bypassing the EGR cooler.
Whilst the EGR cooler is bypassed, this is not a secondary method of EGR.
I have worked for Mazda for many years and know the Skyactiv system inside out. I couldn’t type it all out I may do a video on it, but basically the valves work together in conjunction to create volatility and reduce boost charge pressures at certain times when the EGR B circuit is activated.
Every other egr set up I have encountered have as you explained a method of by passing the egr cooler but always a vacuum controlled flap just to direct exhaust flow through the cooler or not, on the one egr pathway.
But isn’t it great to be interrogating our thought process like this. A video would be fantastic, I look forward to it. And thanks again for taking the time to explain your thoughts on it. I love it 🙏🙏🙏👍
Good comment lads but how do some diesel engines produce more carbon deposit than other engines which causes more egr related problems causing more headache
@@johnbarry5368 what my thoughts on this engine design is that they have 2 high pressure egr valves which in theory have the ability to allow twice as much unfiltered exhaust gas direct from exhaust port / exhaust manifold into the intake manifold. This I believe could cause twice as much carbon buildup 🤔
Let me know what you think 🤷🏼♂️
@@kennedysgarage3281 yes I'd have to agree with you it's a good idea but when them engines have a couple of miles on them carbon builds up fast then take in to account oil changes 10k kms is more than enough but people usually run over that and city driving is more strain on the system anyway diesel engines with thermo systems as in thermo plungers seems to produce less carbon
Sir Your are good explain egr about this ....👌👌👍🙏
Thank you Lovepreet 🙏🙏👍
Always a good watch ..could watch you all day on cars very knowledgeable ....may i ask in yoir opinion what wouod be a main cause of thermostat not opening much /barely ? Btw its a new oem intsalled with wiggie at the top ..2 new oem in 6 month to be sure , core bypassed 4 now cheers ..ive got the control valve here a 2nd ..im apmost sure mine dont open properly ..maybe why my cooler was so caked/blocked plus the odd groan noise ..ill ciran it up this week amd try it cheers in advance peter
Bro, 100 thumbs up for admitting you were wrong about the high/ low EGR valve.... and then get right to the correct info we need to know.... 👍👍
Thank you Corey, unfortunately we can’t be right all the time 😬😂😂😂
Interesting to hear you thinking out loud here Peter. I admire you for being so open and honest rather than hiding in case you say something that might not be 100% correct. None of us knows everything and your honesty might help us all to learn. I’m inclined to agree that both these valves are EGR valves regardless of what Mazda care to call them. Each has the ability to regulate EGR flow, one a flow of cooled EGR gas and the other the flow of non-cooled EGR gas just as you say. I’m guessing the design might be an attempt to further reduce NOx but from a simplistic and slightly cynical point of view they’ve got a system with two valves which are a common failure item on almost every diesel vehicle (so twice the chance of problems) and a machine that seems to be very efficient at creating high volumes of carbon and throttling itself to death! If @arsautos9797 does produce a video then I’d be keen to see that and gain a further understanding of this system design. (Maybe you could put a link here if that happens?) Nice Dave Sterl Polo shirt btw; I don’t have one of them! 😉😉😜
😂😂I like Dave, he is a very intelligent fella & knows a lot about a lot. He has called down to us for a night & we also met up at a trade show in Dublin. I will put up a link if the video comes & thanks for watching & commenting, I very much appreciate it 🙏🙏
What you are doing here is a rare occurrence in the automotive field, you are testing and experimenting on a system to gather some data. just the act of doing this puts you in a very select group of people. On top of this you are filming it and showing it to us. Thank you.
I am by no means a bright spark, so I’m trying to educate myself & hopefully it will help someone else out 🤷🏼♂️
I’m enjoying the crack doing it too, some very good & invested tech’s out there.
Thank you very much for watching & commenting on some of my stuff, I very much appreciate it Mr. Blonde 🙏🙏🙏👍
The SH-VPTR engine - 2.2 SkyActiv Turbo Diesel uses what Mazda refers to as VVL - Variable Exhaust Valve Lifting. The exhaust camshaft opens the exhaust valves slightly during the intake phase to allow hot exhaust gases to recirculate to the intake and warm up the engine faster especially during cold morning starts. I guess that is done through the EGR intercooler bypass. But once the engine is hot enough the hot exhaust gas is no longer needed so I guess the valve is shut off and all other recirculation has to go through the intercooler since cooler air is better for combustion. This is just my opinion, I could be wrong.
It sounds like very plausible information. Thanks for taking the time to share it 🙏🙏👍
Another outstanding video Peter…Nothing can ever be stupid when there is learning taking place and this video, as with all your videos are filled to the brim with extremely useful insights and education. These engines are just fascinating. I’ve picked up a 142 Mazda 6 project..I was told it had a knocking noise but on delivery and an oil change it’s running as sweet as a bird (had hoped it had eaten itself 😂 - very disappointing 🤣) but will do all the Preventative Maintenance on it just in case….
You mentioned you felt one “EGR” was to help speed up engine warm up..have you noticed how sometimes these engine go to about 1750rpm at cold start (normally) and run that way for maybe 20 seconds…would that theory also apply..I haven’t come across another car to do that and I always thought an engine is best kept to low revs on cold to allow the metals to expand slowly…. 🤷🏻
I have been noticing that on all the Skyactive’s but didn’t know what it was until another commenter explained it is called AWS (accelerated warm-up system). I think it’s amazing what can be learnt by doing this.
And your possibly worse than me for wanting hardship 😂😂
But it is a nice bonus to not have to rip the engine apart, thanks Damien 😉😉
@@kennedysgarage3281 I love hardship Peter…. 😂 Engine ripping would be a bonus 😂😂😂
@@damienkearns9922 😂😂
Being prone to build up carbon doesn't mean the car is bad but it's because they are truly reducing emissions as much as possible. It's a result of the EGR system that cycles the gasses again in the engine for full combustion and thus reducing of nitrogen oxides. The result is increased carbon buildup which requires more frequent cleaning. Without the EGR, there would be way less carbon over time but the car would pollute the air more.
Well explained, quite a simple process but a lot of people don’t understand it like you. This engine design has 3 means of exhaust gas recirculation, lots of carbon 😬😬😬
Very interesting as we run a fleet of fiat ambulances that lads call low pressure and high pressure egrs but never made sense like your saying there are both egr just one is used with a cooler for temperature every day is a learning day
Mazda Skyactive is the only 1 I have seen this type of system on though. Your fiat’s might have a high & low pressure egr’s. Low pressure egr will be taken further down the exhaust system with a throttle flap on the exhaust itself to create back pressure when needed to aid low pressure egr flow. If that makes sense 🤔🤔
Hi ill have a look at exhaust see if flap is in exhaust today as a lad at work has engine out of one he is putting new engine in as have been looking at the egr system on his engine and is different setup too mazda
I think arsautos has answered this one. And I too have learned something from it
Every day you learn something new, motor vehicle technology is advancing quite fast. Cheers Chris 🙏😉
Hi, massive thanks for doing these videos, once you do the the removal and cleaning of egr and inlet, does it need reprogramming? Also are these really that bad of an engine or just bad at causing carbon? Thanks
Sometimes they need air flow meter resets but not in all cases. I don’t think they are that bad they just have a bad reputation from people not able to or wanting to fix them correctly 🤔🤔👍
Hello Peter, thank you for helpful videos. I was wondering if your location is near London. My 2016 Mazda6 engine oil warning light came on. I would have loved you to check it out
Thanks, Joe
Unfortunately Joe i am in Ireland 🇮🇪. But you should be able to find some close by finger’s crossed 🤞.
Your problem is most likely to be injector washers after failing & blocking the oil strainer in the oil sump 😬
Fantastic video very informative can I ask a question about the "2" egr set up ...why is gas put thru a cooler and one direct from the engine is this why these engine coke up with carbon so easily is it worth blanking off the cooler side as in my opinion this is why you get so much build up hot and cold gasses mixing and sludging up
Egr gas is used to reduce cylinder temperature ( no oxygen = less heat )
colder exhaust gas reduces temperature more efficiently. Some car manufacturers tried only low pressure egr but reverted back 🤷🏼♂️🤷🏼♂️
I try not to over think these things & repair the faults as they occur. The carbon is caused by egr, but is it a necessary evil in modern engines 🤔🤔
@@kennedysgarage3281 so can I ask how do I reduce the build up in my cx5 2.2d I use good fuel drive hard regular ...been told to blank off egr and get it mapped out of the software
@@micktriplow1184 that is one option but personally I don’t like deleting software from engine ECU’s
The 2nd option is just to do as the service schedule recommends & clean the intake manifold and ports every 100,000 kms. It isn’t that big of a job just that everyone try’s to avoid doing it. It just doesn’t make sense to me 🤷🏼♂️🤷🏼♂️
Tha. Much appreciated
🙏🙏🙏😉
It actually makes sense.
It is all quite simple & not worth panicking over. The intake system needs to be cleaned every 100,000kms & your done 🤔
Thanks Tobs 🙏
Hello mate, just wondering if you know any decent garages which have as much knowledge as you over in North West England? Had the EGR blanked off as dealers wanted £800 just for the part, and got recommended from garages to just blank it off and after already spending quite a bit having it carbon cleaned etc was beginning to lose hope. Anyhow, it has been blanked off and car seems to run decently, however when I scan with my cheap OBD reader it states the injector test fails, no faults or anything on the dash and seems to run decent, bit of smoke on startup but runs fine after.
Just after a decent garage which have good knowledge of the Mazda 6 and it's issues as you do, I know a good one for my Insignia but struggling to find a solid one for the Mazda.
Unfortunately I don’t know any garages in North west England. Most garages try to avoid Mazda for some strange reason 🤷🏼♂️
What part was €800 that made you block the egr system??
I don’t believe in blocking off or deleting anything in cars. Just fix them, but unfortunately this isn’t achievable for everyone 😬
Hi, very good video. Can you tell me please how much do you charge for this type of carbon cleaning (egr, manifold)? Also where is MAP sensor? Can not find it. Thank you
It should cost around €600 & the MAP sensor is in the intake manifold just above the alternator. It kinda hides under the wiring loom 🤞👍👍
Hi Peter, have you ever seen the High pressure pump giving bother in these. I've a cx5 crank no start. No codes coming up but I've no fuel pressure on live data. Filter has been replaced. I've no gauge to read the actual fuel pressure at the pump.
I have never encountered a high pressure fuel pump problem but that’s not to say that they don’t fail. Do you definitely have low pressure fuel delivery getting to the pump ??
Nice one Peter, tho exhaust gases cool the engine as opposed to heat it. I use the thought process of what would happen when you add an inert gas along with the fuel and air. Is why i do not recommend or condone blanking. I think you may be testing Cunningham's law here.
Absolutely correct at normal operating temperatures Dave. Egr reduces nox & cylinder temperature above around 1800 degrees. But some engine designs & manufacturers use exhaust gas on cold engine start up, they introduce a small percentage of warmer air only on cold start. But it is a fine line between increasing & reducing thermal management/cold start friction. But I only read this crack and every day is a school day for me, I don’t know who Cunningham is 🤷🏼♂️😂😂😂
Would you recommend a chemical carbon cleaning for the 2.2 Skyactive D? It’s more common here in Dublin and just wondering if it will help with the carbon buildups on these engines.
In my experience I don’t believe any carbon clean will remove this amount of carbon. Just my opinion though. It cost around 6 to 7 hundred to do it correctly 🤔🤔
I can show anyone who cares the same vehicle running with active EGR & Inactive EGR so you can see the difference.
With active EGR, the vehicle will be down on power, throttle response will be slower, fuel economy will be far poorer. The engine will be far "woolier". That is with a perfectly working EGR system. No faults.
With Inactive EGR, power will be up, throttle response will be much snappier, fuel economy will be far greater. Plus the engine is now not drowning in carbon deposits that rapidly build up, making the EGR issue even worse.
Caveat is that the average ECU will take almost 100 miles of driving before the ECU adapts to running inactive EGR, but once it adapts the difference is night & day. Ignoring these GDI engines & jumping across to TDI engines - but it applies to both - a TDI will run so much more economically with inactive EGR that it is comical - EGR active, average runs high fourties MPG, there or there abouts - EGR inactive and no other change whatsoever, mileage jumps to high 60's, into the 70's & if you know what you're doing, know what other junk to delete, you hit a handy 100mpg from that yoke that was struggling to do 50 last week. Pretty much.
The MPG computer on my own personal car usually returns ------ as the figure is deemed "Implausible" by the ECU.. I sulk if it does less than a consistent 70-80 mpg. 100 is nothing rare, EGR is daft tech.
and it always was - since its first inceptions. I started binning these systems for people decades ago & the difference was always immediate. That & fuel trims - factory fuel trims - since back when it was set using nuts & bolts - were always "This is the middle ground!" - since forever. They were never set up for peak economy, or for peak safe power, they were always set at some wooly middle-ground nowhere land with acres of room for improvement either side of the factory setting.
Neither very economical nor very powerful - but "Safe" was always the factory aim - which usually translated as "Crap" in real world driving - and not much has changed. There are better settings - always.
😂😂😂you ran out of room on the 1st page. I really don’t like them either but all types of deleting are coming to an end in the next few years. The NCT & MOT’s have to measure ‘NOX parts per. million’ & Dpf / Egr deleted vehicles could be rendered off the road 😬
It has just been introduced in Germany & the Netherlands.
But a very well explained reply 👏👏👏💪
Hi Peter, it's very interesting to watch and learn from your videos, thank you because of that! I own Mazda with this kind of engine and can You tell me why is my turbos inlet pressure too high (over 150 with full throtle and when released drops and stays at 96) it should be between 0-100kPa?? And at the same time my exhaust sensor is reading pressure over 300kPa when it should be between 0-150kPa.
Thank you very much
Stipe Petrović, Croatia
PS: I forgot to mention that I recently cleaned intake manifold, checked all pipes and clean MAS souch as exhaust sensor
I’m assuming that the only reason you think that they are too high is due to your scantool data going ‘red’ and above the desired value ???
If so your car is correct and it is the scantool wrong. It seems to be quite a common issue with Launch & Autel.
I talk about this on my latest mazda video, I’ll copy and paste it.
Let me know if this helps 🤔
czcams.com/video/Z7n7UGKyyV4/video.htmlsi=mT2ykzEFEUMJkU61
Yes, scantool shows me info above recommended values and if I push car little bit harder, it turns on DSC, TPMS, ABS mistakes and goes into "safe mode" (turbo off) sometimes "check engine" but not every time. This is happenig only when I drove it in high RPM-s
@@struja008 did you see in the video I pasted how high my readings go ??
The only reason you are getting SCBS & ABS faults are due to ‘Invalid data received from ECM/PCM. (Engine/Powertrain control module)
So you will have some fault codes stored in the ECM after those warning lights illuminate. If not then as in the video I paste someone was playing with the software 🤔🤔
Hi, I think that I have solved this problem, no more warning light or safe mode!! I just clean sensor pressure exaust pipe (with thin steel cable), reset the sensor via diagnostic tool and so far car is running well no matter how I drive it.
Thank you one more time
The title was "why do they build up so much carbon". Was there an answer please? I understood that Mazda ran the engine hotter to reduce carbon build up- maybe that mechanism is as simple as the EGR bypass valve without cooling?
Yes, the answer is quite simple Mazda’s engine & emissions design it to use a lot of exhaust gas recirculation. This exhaust gas is good for emissions output but bad for intake manifold blocking with carbon from that exhaust particulate. The should be cleaned every 100,000 kms or so.
Does that make sense??
I always believed that it was Renaults job to reinvent the wheel in the car world 😂 we all know one egr valve is enough headache never mind two 🤦♂️ thanks for taking time out to share this, just seeing the manifold stripped so we could see the exact route of the gasses 👍 whereabouts in Ireland are you based?
I’m based down in Waterford, a grand spot 😂😂👍
@@kennedysgarage3281 brother in law has moved to Ireland he lives in loughmore. Although I have never been I have funded the miss’s a few times now for her visits. She loves it there my wallet doesn’t 😂 she was there for a long weekend Thursday till Sunday. She has visited Waterford to some crystal tour. Stay bright 👍
@@johndutton2895 let me know the next time ye are over & coming down south, my wife has an Airbnb. ‘Bee cottage on the greenway’ some pretty cool mountain scenery & hikes to do there 😉😉👍
Peter, hope you can help me here as you are probably the most knowledgeable CX5 repairer on CZcams! My 2016 CX5 2.2d Skyactiv has been in for a walnut blast back in 2019 which was before I owned the vehicle due to Intake Manifold soot accumulation.
The car has done around 50k miles since then, a lot of motorway drives where the engine has ran at optimal temperatures and when the missus drives it definitely gets redlined lol.
My car has just gone in today for a 2nd time to be walnut blasted due to soot accumulation, this is quite a costly repair.
Could the soot buildup be prevented by blanking the EGR valve off like older diesel models and having it mapped out? I can’t be forking out over £2k every 3 years, it’s baffling how so much soot actually accumulates on the air intake, my only guess is that it is from the EGR?
Thanks, Sean
Hi Sean, these Skyactive engines run very large quantities of Exhaust gas recirculation to reduce emissions output. This does cause the intake manifolds to block. 50k miles is very early for it to be needed again though, watch because you might have another issue.
(ie. Exhaust camshaft worn or exhaust pressure sensor A & pipe😬😬)
The egr system could be deleted & blanked but I find it plays havoc with cars for future repairs, they never really tell the whole story when interrogating with Scantools afterwards 🤷🏼♂️🤷🏼♂️🤷🏼♂️
But they are only my thoughts 🤔🤔
I am delighted you like some of my content though 🙏🙏🙏
@@kennedysgarage3281Hi Peter, I also have one that needs a second de-carbon after doing an additional 43,000 km since the first de-carbon at 70,000 km. Mazda dealer charges €900 for this. In the intervening period they also replaced throttle body and exhaust pressure sensor. I’m concerned that getting the de-carbon done again could be a waste of money. What are your thoughts? Thanks.
@@johnflavin1602 I have seen them to but up quite a bit of carbon in 40 to 50k but it shouldn’t be enough to cause any air restriction. Are you sure that is causing you problem ???
Would you chance cleaning it yourself 🤔🤔
@@kennedysgarage3281 Thanks for replying Peter. I’m only going by what the Mazda dealer is telling me as I’m not mechanically minded. The last service showed the P0101 fault and the dealer is saying it needs another de-carbon. Car runs ok but keeps going into limp mode on a long journey e.g. Cork to Waterford. If I stop and restart the engine, full power usually comes back. When the car is stopped it’s ticking over roughly in that every 10 seconds or so it seems to gasp for air and the revs go down for a split second and then it returns to normal. It doesn’t do this gasping thing all the time but most of the time. I’m in Cork but have connections to Waterford so would want you to look at it sometime if possible. You’re probably inundated with Mazdas now from all over the country.
@@johnflavin1602 they are coming in from everywhere 😂😂😂😂
But let me know when suits and I’ll take a look, cheers mate 😉👍👍
Hi Peter The Egr Bypass is used as part of the AWS system (Accelerated Warm-up System) The high reves you hear at the cold start of the engine. It may have other function also. PS the video dosen't really explain why there is (so much carbon built up) . I think the carbon build up is because sinply the EGR systen is so good which is inversely so bad for the engine. I have Mazda 3 and I take off the Manifold every 50k and clean the whole engine . Alos use Mazda DPF oil and that will sort out the issues with the oil galaries and bottom end , chain and oil pick up.
Ps love your work .
I have never heard of AWS but have heard the engines run at high idle on cold start. So I googled it, very cool.
I believe the carbon buildup comes from what I call ‘ the 2 egr valves’ or egr valve & egr cooler bypass, unfiltered exhaust carbon deposits. Double entry passages = double the carbon.
Low pressure egr systems pass through the Dpf first which filters that exhaust gas. It’s all very thought provoking 🙂🙂😉
Hi maybe You know if Mazda use good torque settings for the new silver washers of injectors. In service manual is finger tight 2 nm and -90° and the other one finger, 2nm and 270° if i good remember. Maybe this is inproper tightening. Why the engines has so much problems?
Your torque settings are the same as the torque settings I have on Autodata. Another commenter did say they had changed but I could never find them or he didn’t share them. I usually give my own little squeeze at the end if I feel it is needed 😬😬👍
Thank You for fast answear. If i find some new info will add here. I heard also they changed washers 2 times and the torque.
Have a nice day.
@@losgorniacos that would be great 🙏🙏👍
Hi, also just wondering if you know any decent garages which have as much knowledge as you over in London or near East London? Looking to get the EGR and Manifold cleaned out by having them taken off. Car is throwing 2 error codes which are P0401:00-64 AND P0101:00-64
Thanks
I’m not familiar with any garages in London but I am part of The Dpf doctor network, so there might be a reputable member in London . Just search the Dpf doctor in your area. Both of these faults will be more than likely fixed with the intake manifold & port clean. Let me know if and when you find someone 👍
I just bought a Mazda cx-50 non turbo due to hearing good things with reliability and the fact they do not use CVT transmissions. Did I make a mistake?
I don’t believe so, most car owners think that if they change the oil & filter every 10,000 mls that it is comprehensively maintained but just follow the manufacturer’s service schedules. The schedule also changes annually as they see faults arise. A very nice car you bought 💪💪👍👍
Hi. I'm having mine carbon cleaned by the dealer. Would using premium fuels or additives eliminate or reduce this problem occurring again?
I cannot say 100%, but my thoughts are that no. Additives don’t really help, these engines run large quantities of exhaust gas recirculation which inevitably creates carbon buildup. Which means the intake system must be cleaned every 100,000 kms.
Hopefully this helps 🙏🙏
better option cleaning EGR valve or system with SCR ? :D
I’m sorry miso777111 but I don’t understand. Do you mean Mazda would be better if it had an SCR system ( selective catalytic reduction ) ???
Hi, I have a 2013 2.2l Skyactive diesel that has been identified with the leaking injector 4 issue you have have helpfully described previously. There has been no engine error light but it developed the chuff chuff noise (which is why I took if immediately to my usual garage). They noticed the filthy engine oil and then identified the leaky injector valve. Can you give me an indicate of what engine damage may have occurred and if it is worth getting it looked at for repair?
As described, the leaking injector will build up carbon in the crankcase. Which in turn can build up in the oil strainer and cause oil pressure problems. I would advise getting the injectors removed & new Mazda upgraded washers fitted. Then if possible remove the sump and replace the oil strainer, it will cost an additional 5 or 6 hundred but well worth it.
Once this is done there are no other related issues 👍
How many miles had it done?
@@kennedysgarage3281 Are leaking injector washers usually evident by visible carbon deposits around the injectors on the top of the engine? Looked at mine today in situ, looks clean. Regularly serviced, 2014, 45k miles, low annual mileage, so hopefully some way off the clogged up inlet scenario...but guess those crappy copper washers could give up at any mileage? Maybe worth having done if not too expensive; I do like the car.
@@SaxJockey leaking injector washers are only visible once removed, on the injector body & just under the rocker cover, in the hole they came out of 😉
@@kennedysgarage3281 Thanks for the clarification. Thought I'd seen another video where there was external carbon build up, that was probably a very extreme/long term leak. Mazda put some nasty hidden faults in this engine (injector seals, excess EGR volumes and the DPF regen). I will get a quote from my local garage, they did highlight new seals as a pre-emptive action. I looked at the top of my injectors, all clean...but clearly that doesn't mean much at all. Really appreciate all your responses 🙏.
Is this the common reason for p0101 extreme carbon build up
Yes Eoghan, it is the most common cause of it. But as I have learnt it can also be caused a worn exhaust camshaft & or hydraulic tappets failing. These yokes can be expensive to get right 😬😬
Hi!
I'm in france. I have a 2017 2.2 175 ch. I have a low oil pressure warning light, but I have no leaks at the injectors, no carbon deposits. The camshafts are damaged (known problem). What do you see as solutions? Would an oil change and oil filter fix the problem? Cordially
I don’t think an oil change will fix it 🤷🏼♂️🤷🏼♂️
Have you changed the oil strainer on the oil pump in the sump ???
@@kennedysgarage3281 yes i'm going to change the oil strainer too
I love this car but I'm thinking of reselling it because of the problems.
I've 160 000 km
@@xavierchabin883 that will fix it 🤞💪💪💪
@@xavierchabin883 once the strainer & camshaft are done, it should be fine 🤞🤞👍
Hi Peter, I have a mazda 6 2.2 skyactiv-d which I have just bought on a 2014. Its now back where I bought it as when driving it home I had no power at around 3000 rpm under that it had plenty of power. They have had the car two weeks and still can not work out what is wrong with the car..? I also found at the same revs it started to judder quite badly but then stopped doing it but again no power around the same revs 3000 rpm. Do you or anyone else have an idea as to what may be causing this problem please.. ? Cheers Alan
I would assume that it had gone into ‘limp home mode’ which won’t allow your car engine to rev. The intake manifold & intake ports blocking is the most common issue with the Skyactive engine. Unfortunately without seeing the vehicle I’m only guessing, but well worth a look 👀 🤔
Ask them what fault codes they have ?? It might help 😉
@@kennedysgarage3281 Good morning Peter,
Thank you massively for responding and giving me your thoughts. There was nothing on the dashboard to suggest its gone into limp mode not one warning light at all. I'll be asking them to check what you have suggested. Once again appreciated. If I was anywhere near you the car would be with you belive me. Love your videos and detail you go into them with...👌👍
I bet it was your small turbo in end ? Or the valve between them
Hi how do I contact you? where are you based? I have few questions related to Mazda 6 2.2 Sport 2015 plate.
Just search Kennedys garage Portlaw & I will help in anyway I can 😉
Just search ‘Kennedys garage Portlaw’ & I will help in anyway I can 😉
Is an oil pump a nightmare on the 2015 2.2 Sky-D Mazda6????
No, the oil pump timing chain & the splitting of the pump/ balance shaft module is a little daunting on the first attempt but not too scary 😉
czcams.com/video/9fR6J4kv6Is/video.html
@@kennedysgarage3281 Agreed, time taken, could be ok
Hi Peter, I have the same Mazda and I have a problem with the smoke, I have already changed the new DPF and I check all the injectors and I even did a complete oil change
the smoke and a little gray white I have no problem with overheating the car runs perfectly without any fault except the smoke help me please
It could be one of the turbos failing, they would be worth looking at 👍👍
@@kennedysgarage3281 Do you have a precise idea because I really checked everything except the turbo. and what exact turbo is broken. do you have a video regarding this failure? Please help
@@talalazad2932 it really is like telling a doctor that you feel pain & asking how he can fix it 🤔🤔
Without seeing your car it is like impossible for me to pinpoint a problem for you. I will copy a paste a turbo replacement video that shows me checking the small turbo, it might help 🤞🤞
You hardly live in Ireland ??
@@kennedysgarage3281 I live in Belgium that's the problem thank you for making me a video I will never forget your help
@@talalazad2932 🙏🙏
Apparently Japan advise 3-5000k between changes oil
I’m actually not familiar with that, so thank you 🙏
@@kennedysgarage3281 I've been thinking about it, I only had the info of 1 man/women on CZcams. But it would make sense, I reckon it'll be 10,000k's Japan not the UK/IRE 20,000K's 12,500 miles. Some mechanics service there own cars every 5k miles so that makes more sense, 8k or 10k's Japan schedule, doesn't make sense other that to create inbuilt obsellecance for our UK schedules.
SkyActive tech just means lightweight, G for Petrol, and D for DieselyWeazily.
Bet you'll know that lightweight nomenclature , lovely to drive Maz6, over light-weight over engineered things break , filters block, carbonised.
3 Main faults I know of I know of ( 3.5 faults )
1.DPF causing oil dilution
2.Injector's causing oil dilution ( strangling coking up )
3Overheating from , well, everything inc the above
Exhaust Temp sensor was recalled and made Metal
Shame they're so nice drive and beautifully styled and I like the tech ( engine ); to drive
I get hit with a big STICK every time I dip my toes in with a below below trade book Sky-D !!!
The petrols are way over top clean book, so cannot win
How much do u charge to clean carbon on engine
I charge €550 but this will possibly be different from other workshops depending on their labour rate. Mazda recommend it is done every 100,000 kms
@@kennedysgarage3281 thanks Peter
@@kennedysgarage3281 got turbo’s done €2700 big problems whit the 2.2 sky active
@@patrickkavanagh4301 What happened to the Turbo?
But how do we stop all the carbon buildup
Hey Steven, some people do EGR delete but in my opinion don’t do it 😬😬
The intake manifold will block around every 100,000 kms. No worse than a timing belt on Volkswagen or Audi. Just my opinion though 🤷🏼♂️🤷🏼♂️
@@kennedysgarage3281 Does regular change of oil reduce built up? Oil has been changed every 6k-8k and has 99k Km. What I actually can observe that it needs a 10 minutes to warm up so that blue light disappear (even at the 15 C), does that means that I have carbon built up or ? I would really appreciate
@@sull5307 intake manifold carbon buildup cannot be avoided.
But if the injector washers are leaking and over time going to build up carbon in the crankcase and block the oil strainer, well regular oil changes will help to avoid the strainer blocking as fast. Replacing the injector washers and strainer is the best approach though 😉👍👍👍
@@kennedysgarage3281 i read that these engines needs to warm up little bit more than other during start up, so I am not alone. Concerning the other issues, I really don’t have any up to now, but yes, I will do carbon cleaning as you suggest, seems like the best approach for keeping my engine in best condition. How I can detect if I have problem with injectors? Also car was serviced in the certified mazda dealer so I guess everything should be okay
@@sull5307 fingers crossed all goes to plan 🤞🤞🤞
Hi Peter, i have excessive regens at approximately every 30-60 miles and rough idle and poor low engine speed acceleration and rough gear change from first to second. I do not have any DTCs, however, when plugging in a scanner EGR A is showing a 99% error.
Is it likely the EGR is stuck open and is causing the excessive regens and poor running? I've already had the intake walnut blasted which temporarily improved the low end acceleration but not the regens, but i don't think the mechanic cleaned both EGRs or the EGR cooler.
I'm considering getting the EGR blanked and deleted (the blank due to the valve not closing). Is it even possible to blank this system?
It is a worn exhaust camshaft & possibly hydraulic tappets causing excessive particulate (soot) in the exhaust & forcing frequent regenerations. Are you in Ireland??
I’m not sadly, although based on your videos I’m half tempted to drive the car over. When I unplug the egr valves the response and smoothness of the car is much better until the limp mode kicks in.
How long should a camshaft change take a garage give or take?
Many thanks
@@christianhillier5640 it will take around 8 hours to replace the exhaust camshaft, it will be necessary to check the hydraulic tappets underneath it too as these can get quieter after the egr valve is disconnected 😉
Thank you so much Peter.
Called a garage to suggest it might be the camshaft and they say ‘no it’s probably your timing chain, camshafts are rare’. It’s like banging your head against a brick wall.
@@christianhillier5640 the main timing chain doesn’t fail on them but the hydraulic tappets underneath the camshaft can be very noisy 😉👍👍👍
Crap. It’s a SkyA-D. Time to run
😂😂😂😂 poor Mazda 😬😬
I have 5 in my garage,one wit a broken oil pump chain and other wit oil light flickering on,ld say the pick up is half booked because of the injectors leaking… a shit box they are
I do agree, if only the chain & gauze is done before they fail it could save a lot of them 🤔🤔
Are you in Ireland or England, I could do with a few bad engines
@@kennedysgarage3281 in Dublin but don’t have any engines,Donny engineering would have bits for them but I don’t think they are very helpful.Yep I tuck the sump down and the pick up is blocked🙄I have the pick up on but I’m in two minds will I do the oil pump chain 🤫hard to get staff,
Nobody wants to be in Mechanic anymore I don’t blame them😂Land Rover engines are given a lot of trouble as well
@@ccbanger1414 feel to see how loss the chain is in the middle of the oil pump sprocket, if loose better to replace it. Split the chain and turn the engine, might make it easier. It’s a nightmare getting staff now whatever is going on 🤷🏼♂️
The landRovers are very troublesome 😬😬
It's 2023 and mazda has gone backwards instead of progressing. Audi and Toyota solved the carbon issue with adding port injection, but not Mazda, noooo too difficult and costly for them!
Oh interesting, I haven’t seen port injection on diesel before. Is it on very modern engines??
@kennedysgarage3281 I meant on their petrol engines. Audi/VW & toyota have added port injectiors to all their GDI engines since 2018 onwards. No more carbon buildup problems on their peteol engines. But mazda seems reluctant to add simple port injection because they don't want their cars to last longer than the warrany period.
@@ampm9771 I have seen that al right but I don’t think any manufacturers are building them to last nowadays 🤷🏼♂️🤷🏼♂️
@kennedysgarage3281 That's true, but mazda seem so keen on making their cars that don't last at all. You take the undercarriage coating that is nonexistent. I have seen brand new mazdas that have badly rusted. Mazda has done lots of shortcuts that make no sense. The sheet thickness used in the body is not even 1mm. Where I live, mazdas depreciate like there is no tomorrow. Why? Because here people buy cars to last, and Mazda isn't a car that lasts.