Volkswagen/Audi 1.8t Engine Diagnostic & Maintenance Guide (Mk4 Golf, Jetta, New Beetle, Audi TT)
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- čas přidán 4. 07. 2024
- ►The Volkswagen & Audi 1.8t engine was found in numerous cars across the VW and Audi lineup, from the VW Golf to the less-popular New Beetle, and was even used in a high-output form in the Mk1 Audi TT. From 1993 straight through 2005, this engine offered a reliable, torquey, and efficient engine option for those shopping for a small to mid-sized European car.
The VW/Audi 1.8t comes in a variety of different horsepower and torque outputs. At its most basic, the 1.8t offered 148 horsepower and 155 foot-pounds of torque, and at the top end of the spectrum in the Audi TT, it had 236 horsepower and 236 foot-pounds of torque on tap.
In this 1.8t engine diagnostic and maintenance guide, Jay Van Gorden, FCP Euro's VW Catalog Manager, covers all of the most common topics, including:
Index:
00:00 - Intro
01:20 - Volkswagen/Audi 1.8t Coolant Reservoir
01:50 - Volkswagen/Audi 1.8t Timing System
03:55 - Volkswagen/Audi 1.8t Rubber Hoses & Connections
04:25 - Volkswagen/Audi 1.8t Drive Belt System
05:13 - Volkswagen/Audi 1.8t Power Steering Fluid Reservoir, Engine Mount & Throttle Body
06:00 - Volkswagen/Audi 1.8t Valve Cover & Cam Chain Tensioners
07:40 - Volkswagen/Audi 1.8t Ignition System
09:17 - Volkswagen/Audi 1.8t Fuel System
10:50 - Volkswagen/Audi 1.8t Dipstick Tube & Vacuum System
12:25 - Volkswagen/Audi 1.8t PCV System & Battery
13:53 - Volkswagen/Audi 1.8t Cooling System
17:10 - Volkswagen/Audi 1.8t Radiator & Cooling System
19:45 - Volkswagen/Audi 1.8t Oil Pan
20:12 - Volkswagen/Audi 1.8t Turbo Return Line & Turbo
21:31 - Volkswagen/Audi 1.8t Dogbone Mount
21:55 - Thanks for Watching!
Volkswagen & Audi Models Featuring the 1.8t Engine:
Volkswagen MK4 Jetta
Volkswagen MK4 Golf/GTI
Volkswagen B5/B5.5 Passat
Volkswagen New Beetle
Audi MK1 TTAudi MK2 TTAudi A3Audi B5 A4Audi B6 A4Audi B7 A4Audi B8 A4
If you want to learn more about the Volkswagen Mk4 than just the engine, you can visit info.fcpeuro.com/mk4 .
#mk4 #gti #fcpeuro
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1.8T (along with 2.7t) is an OG of VW tuning scene. While not being a VW fan, I do have a soft spot for these.
I'll even bring them my C5 A6 for the videos
I have a 2004 Volkswagen Passat with the 1.8T
232,000 and it never fails if treated right!
Engine Head can be broke. valves seats can broke but not with only 371kkm. Second problem with all vag its oil piston rings. If your engine begin consumpt oil but not leave blue smoke its can be oil into cyl. Another problems a valve sealants. Of course flexible exhaust pipes is broken in vag
One of my favorite 4-bangers. Most of the factory weaknesses have been addressed by the aftermarket, and it's extremely easy to work on. And from a performance standpoint, iron block with closed deck design and really good knock management means they're really hard to blow up once rods (and maybe head bolts) are upgraded.
When this engine start in europe everyone said "its turbo its unreliable" today its better than any tsi engine and more reliable than old natural aspiration vag engines
I own one of these and these engines are tanks if you properly maintain them.
@@StopTeoriomSpiskowymAMEN! 👌🏻
I've had this car since 2016 with 100k, At 188k now and its been a nightmare the first two years. Fought each of these incidents 1 by 1 till i got till 140k, got it tuned, and its been a great, fun daily driver for the past few years with out a hiccup!
That good to know, I am in the middle of fixing many things at the same mileage. Coolant leaks have been endless
Get those metal flanges right away. Especially the thermostat housing one.@@jimmcandrew3540
My 01 Jetta w/ 233k 1.8t Stage 2 tune for about 60k miles now still going strong. Still original turbo. Clutch and TB service coming up this summer.
My 20th Anniversary has 263,000 miles on it and it’s still kickin! I love this engine!
Love to hear it!!
thank you for this video, I recently bought Audi A4 quattro 190hp with 330 000km, so this is really helpful now
I wanna say that am very grateful for your explanations
Excellent videos, so informative
Dr. J is the man! His Volvo vids are fantastic .
Dr. J appreciates you.
Best video and explanation to date....
This and 2.7t are ond of the best engines ever built
Don't forget the 1.9 tdi
Spoken like a true 1.8t/2.7t owner
@@tiko4621 b5 s4 here lol
I wanna say that am very grateful for your explanations 22:36
What a great video! Really appreciate it
We appreciate you
You are simply spot on. My 2003 Wolfsburg edition Jetta 1.8t got 433000kms. I have gone through a lot of replacement parts over the years. This is the end result of owning old vehicles. Thanks for sharing an amazing educational video.
That engine is GREAT pain in ass anyway with 433××× or 150×××× and reperations/ service is very expensive .
In Germany to change timing belt with water pump ,chain tensioner ,chain ,big service in 2010 coast 4500 € and a lot Germans throw that shit on garbage or sald för litlle peng .
Very good informative piece this . I can vouch for many of these problems on my Octavia vrs
Great video, I still love these engines 😀 You covered just about all of the little issues one could expect to have. #NEVARLOSE lol
Thanks for all the info
Good enough for me to subscribe… top to the point upload.😎🤜🏼🤛🏼🍀
The only video that told me anything useful
You are a very good and friendly teacher. Thanks for the video. Greetings from the Netherlands.
Thank you very much!
JDM car fan but the 1.8t is one of my favorites. Favorite German engine. I want to be in another A4 with that engine.
lol. i own an 03 jetta with a 1.8t. I have fixed most of these problems, so i say you're right on the mark
Don’t forget about the o-ring that attaches your oil heat exchanger to the housing. It’s gets hard and cracks and blows out and will empty your oil pan in less than a minute on the highway.
I've owned a 225 for 10+ years now. This is like a walk down memory lane
In Europe this engine was used, in the 180bhp form, for a VAG owned marque called Skoda Octavia VRS which was a very reasonably priced family saloon and somewhat rarer estate (or combi as Skoda called it) or wagon as you call them. Easily remapped to 200bhp and 250 ftlbs, this makes a fairly rapid car due to it's 3000 pound weight. Mine is the very last year they marketed the Mk 1 body shell and is starting to appreciate in value along with very cheap spares cost..... I love it !
Yeah man i own a silver 1.8T 4x4 mk1 skoda octavia estate and if defo has surprised a few people! Absolutely love the car.
In short:
Lift the hood. Replace everything.
Pretty much 😂
Especially True if it's made of rubber or plastic
@@j.m.5995 replace it all with aluminium parts. costs like nothing and big returns
Iv got the golf mk4 AGU from 1999 and have the original S3 coils K04-001-XL 660CC injectors the older injectors cups are plastic in the inlet manifold 2 of mine were weeping bought 4 new1s good amount of grease and a nip they haven't blown by since curpra R fuel pump 4bar FPR stripped out 80% and its 1126kg with me in it full tank these engines are an absolute riot loads of fun and only thing I need is con rods and ur looking at another world of fun vacuum lines can be a pain in the arse. If u want quick 0-60 get the 5 speed box if u want higher top end get the 6 speed but there are 100s of ways ppl have tuned these engines and personally il never let mine go still going at 140.000 miles and I'm not easy on it.
I just picked up an ‘04 Jetta GLS with 134,000 miles and not gonna lie this video scares me a bit but I blame that solely on my lack of knowledge of VW engines. But since it is my daily driver and only vehicle I’m sure my urgent need for this car to run correctly and stay on the road will keep my motivation to learn going. Great video with lots of helpful info.
Congrats on the new purchase Mason! You have the right attitude by wanting to learn, we will do our part and continue posting!
Had 2 A4s both the 1.8 t never had a problem with either, first was 14 months old when I bought it with 79,000 miles just decent oil changes and if like me ya won't have a problem
Just bought a mk4 with an ajq swap from a TT. neat little motor. It is pretty easy to work on. I also run turbododge 8v's. also a neat motor. Non interference. :O)
Great service overview of the 1.8t! 75K for the timing belt sounds good.
as a owner of one, i can say, good guide. nearly every coolant hose bursted on my 99 tt and the thermostat housing leaked. i have a whole aluminum kit for every flange that is plastic by default. vacuum hoses broke, coils werent bad, but replaced them with tsi coils, dipstick is still ok, tho have seen it fail on other engines. valve cover leaaks a little bit on the back side, have a new one laying around, tho might replace the timing chain gasket as you suggested with it. timing belt is now only 3 years old and about 12k km in, so thats ok. also turbos and manifolds are common issues. both had heatcracks on my car. solution: sport cat and better flowing exhaust to reduce back pressure and EGTs. German manufacturer "friedrich motorsport" has a whole exhaust for it in their program in 3 inch diameter and sport cat and TÜV certified, so street legal in the eu.
This is a headache😁
@@3kkk514 i wouldnt have one if i couldnt fix it myself
@@LcFan96 i had one b7 convertible, all u mentioned is all true another common issue is airbag igniter electrician already bypass the airbag igniter under seat from time to time it pop up in dash light and the only solution is to keep deleting using obd vag. Also oil consumtion issue. My Local mechanic check compression test is all good. He reconcon turbo cartridge need to replace or need to modify or change the oil feed hose oil restrictor banjo bolt
@@3kkk514 b7 use the 1.8tsi or not? Either way, if you cant afford one, dont buy one, and thats no offense, they need care
@@LcFan96 b7 2.0tfsi 200hp 147kw not a 1.8 tsi. I only use it for summer convertible. My main car commute to work is my 3 yrs old toyota landcruiser.
Thank You!!
I loved how you showed a totally shagged timing belt.
🇦🇺🤜🏼🤛🏼🍀🍀🍀😎
youre amazing for staying on topic with strictly engine management.. couldn't help but notice that little ripped inner boot under there:(
Amamzingggg Video 👌👍👍👍👍👍👍👍👍👍
NICE!
Nice video can you make a short video about replacing the secondary vacuum pump bolted underneath the subframe toward the rear and removing the vacuum booster hose from that and how to disconnect the plug??
This looks like much, but, to be honest many are just age related. I would rather have faulty hoses, pipes etc, than faulty timing chains, giudes, metal filings in the oil filter, massive oil consumption like other engines develop. I had a 225 TT and did all of these items on it and it was a doodle and a pleasure, instant gratification. I sold the car at 167k and it was still going strong. With a remap on it was dino'd 🦖 at just over 250hp.
I had a skoda octavia 1.8t-00 with a agu engine. Stage1 tune, 2,5” from the cat. GFB dump. Simota air filter box. Mac valve insted of the crappy n85 valve. Clutchmasters lightned flywheel for a corrado 1,8 g60. Exedy golf3 vr6 clutchkit. K03-52 turbo. Strongflex all around the car. 40/60 lovering kit.18” wheels. Very fun car. It had 400 000km on it when i got scraped this year by the new owner. Now i drive a Saab 9-3 vector 2008 1,9TTID
You guys should do one of these for the VW/Audi AWN 4.2 V8
Thanks for the suggestion! Stay Subscribed, we just may!
you forgot the n80 purge valve evap leak problems. also saw a huge rip in that axle lmao but great video.
It would be awesome if you guys did a turbo replacement video
Could you do a diagnostic and maintenance guide for the 2.8L 12v and 24v VR6s?
This is all the maintenance I have done to get to 220k. Timing belt Inc again 75k in 2.5 years.
As soon as you mentioned corrugated hose I thought of the mk7 jetta with the 1.4t.....those n80 valves always replacing because of that crap plastic hose that loves to crack
Crazy how much power you can make out out thes motors
You forgot my 2004 VW Passat 1.8T Four Motion 5-Speed Wagon. 😉 All good tho. The 2 years my exact make and model about 7k +/- where made... Always good to replace the timing belt and water pump at the same time. Timing belt goes wrong big problems.
A video on 1.9TDI ARL the pd150 version would be sick
great info as always. I would point out that the AWD engine family i think the timing belt is recommended to be replaced at 60k miles. With these being interference engines it's too risky to try and squeeze extra miles out rather than perform the service.
Based on my decades of experience with these engines, the timing belt itself isn't the issue. The OEM water pump with the plastic impeller usually reaches it's failure point on or before 60K miles. Using the aftermarket water pump with the metal impeller will extend the timing belt service interval to 75 - 80K.
@@dantesinfernopurgatory7826or you could just change it every 60k as recommended and have peace of mind
I just got my silver mk4 gti a few months ago
Looking for one of these videos on the VR6 from the same era!!
We don't have anything at the moment however we'll keep your recommendation in mind for the future. Were you looking for the 12v AFP engine specifically or the 24v BDF engine?
@@fcpeuro I have the 24v so that would be of most interest to me personally.
Idk shit about vw but I bought one and I'm trying to build it. Looking forward to more videos thanks 👍
hopefully youre motivated. lots of cool things to learn.
I got a mk6 2017 jetta 1.8 and there’s a lot of stuff on these videos that aren’t the same. I’m somewhat new to working on cars and vw are more intricate, any videos on that would help
Excellent video. Thank you. What about the fuel filter?
The fuel filter is a regular maintenance item and should be replaced routinely.
Sooooooo....everything breaks, got it. I just got a mk4 about 2 months ago and i have been constantly dealing with bs. This video is making me think i should cut my losses and run
Another 2 common faults to look out for is a cracked sump due to the low position and also the dipstick tube losing brittle parts into the sump and blocking the oil pickup causing the oil light to come on. Checking the oil and seeing plenty of oil makes you think the oil pump failed until you take the sump off and see the issue. I've had both issues over the years on several 1.8T's but the sump was the most common, its quite fragile.. Liquid metal after draining the oil fixed the problem until I've get another sump to swap over. Then it's a check in the pickup and a look in the sump for any sparkles..
Great notes, sorry you had to endure that!
A little tip for thermostat i take out alternator as it makes it much easyer
That may work for some folks as well, I believe that method makes access to the housing bolts a bit easier.
My housing on my B5 Passat had a hairline crack in it. I disconnected the battery and removed the tbi hose. Easy peasy
@@coache1nine being a GM guy and Driving a 1994 GMC safari, i read TBI and jad to do a double take here LOL
I was able to replace the thermostat on my '03 Beetle Turbo S with just a 6 inch wobble extension- I don't think removal of the vacuum hoses and other assemblies is necessary to complete that job.
Движок Легенда 1.8 т 20 V 💪💪💪👍👍👍
Not forgetting on the list the VW Polo GTi 9n3 (BJX)
I will take my 1.8t awp over a 888 any-day . It is such a simple engine to work on. Mine is complete apr stage 3 plus with complete engine internals done complete sai delete it is a beast
How much did that cost you?
I would just mention little bit more about PCV hoses from block all the way up are very bad on them and normally falling apart causing issues
Iam working on my bettle 1.8 L turbo I was replacing the turbo and I need a picture diagram of the vacuum lines to make sure that I get it done right.and I want to replace the bad hoses with new ones
I miss my Jetta🥺. Ugly ass car but she got me places and handled my teenage driving
What do you think about the 1.5 tsi engine is reliable?
I have a MK4 1.8t Jetta , if my cam chain tensioner is going out, would that cause an ugly noise? I can’t seem to find out what’s wrong with my car. Because the noise only happens when I first turn it on, then it goes away after RPMs go ip
Thanks mate, this video will be very useful now that I have just got my mk4 golf gti back after ten years in storage. I have some questions for anybody who may know and wish to take the time to help me;
Considering how long it hasn't been driven, what critical things must I change on it before attempting to start it?
It was taken off the road a decade ago because I suspect that the turbo let go. It was making funny noises for a while before it went, and when it did go; it chucked out a lot of white smoke out the back as it suddenly lost power. I turned it off almost immediately and it hasn't been driven since. Could it just be a hose or something? I have a different turbo for it now but haven't put it in yet.
Can a turbo be replaced on this car and engine on a driveway? or will it need to be put up in the air?
I have so many plans for this car and seriously don't even know where to start, I haven't worked on a car in ten years! It has a fairly low mileage for a T-reg at 128k.
You are doomed. Sell it now. Nuclear reactors are being shut down and parts are be being discontinued.
Looking at a mk4 gti auto. Are they really hard to work on? And are they reliable? Any ideas tips o would appreciate it!
Hopfully you see this but I’ve got a leaky injector and I keep getting engine light and a p1128 fault code could that be the issue??
Out of all the golf gti's I've ever owned the 1.8 t has been the most reliable. The Mk5 and 6 let me down badly.
How so?
@@tiko4621 cam follower and oil pick up pipe on Mk5 and cam chain and tensioner on Mk6. Cost me big time.
@@jasonjay7650 huh, so far my biggest problems on the 20v 1.8t have been simple sensor issues and vacuum/boost leaks Been pretty good to me thus far.
@@tiko4621 I had the 180bhp anniversary golf. Had it 5 years and only needed a new diverter valve.
@@tiko4621 Direct injection-related carbon issues, water pump assembly failure, cam followers and high-pressure (cam driven) fuel pump is the culprit in the FSI and early TSI engines of that era.
Please you didn't throw light on the Idle Air Control unit. Where exactly is the IAC located on B6 Audi A4 1.8T petrol engine? thanks
For the metal impeller water pump I definitely recommend a good quality one. I've seen and heard the bearings go bad and the metal impeller tears the inside of a block when it went bad
You're right...my original waterpump failed and I replaced it with a cheap one but it was a metal one...that one failed after 2 months
The metal impeller is a solid piece that has nowhere to go, it may scratch the block but if it is a permanently pressed onto shaft gear and impeller, like the INA brand, there is very little percent of failure, any failure wore be seized or failed bearings, with shaft and impeller remaining in place. Doing no damage at all. Don’t buy rebadged eBay junk,and they don’t fail.
It's the same topic for 1.9 tdi. It's not a problem, just buy new one every timing belt job and you're good.
Can i please ask you why my 1.8t bjx at full revs stutters sometimes, lambda sensors replaced. Fault code P3211 sometimes. Only when is does brbrbrbr.
Hey man, i had my timing belt snap, ad i changed every component from the valves to the tensioner as well as the cam sesor but i get this error 16727, which basically says "camshaft position sensor: signal too high", is it my timing or sensor?
Is there an upcoming video on the NA 2.5L 5cyl? I am in the market for a 2.5L JSW to mod and I feel this is an underappreciated motor.
We can assure you that we appreciate the underappreciated motor 😉
those are awesome engines, othwr than the vacuum pump oil leaks they're very solid
where is that link to the vacuum cluster hoses you mentioned @ 15:06
I need help, please. I have A4 B6 1.8T. Want to Audi Service and they made diagnosis that camshaft sensor is done. Car is in kinda limp mode, has really no power and stutters on mid rpms(around 3000-4000). Also wont start on first try, I have to try 5-6 times to start it. I've changed MAF and the Camshaft sensor but still nothing
You should replace the G28 sensor (engine speed sensor) if your car is old. It caused my VW to stall while driving.
That is a great note, Leo!
I need a diagram of vacuum lines for a 2000 vw bettle 1.8L turbo
How about you guys make the same video about bmw N55?
Consider it done! czcams.com/video/rPUUNhjJjHU/video.html
what about the n249 delete? is it ok to delete that?
That, my friends, is why you buy the VR6. Just kidding--it's honestly hard to tell sometimes if the good outweighs the bad on a given day...
I got a vr6 and 1.8t i like both of them for different things
What about the tt240?
Wasn’t there also a 240hp version in a late Audi TT?
👍👍👍
Same engine goes in Polo 9n3 GTI and GTI Cup edition
Since 3 month have milky oil in my 1.8T AWT engine. I didnt missing any coolant and also super clean my coolant. If its would be coolant leak,headgasket then I think in 3 month should be missing.Do not overheat even if I driving long 3500rpm+.Everythink looks,feel fine.I driving 2x20km a day minimum around 800km/month.Anybody knows why have water/humidity in my motor oil?
I have a problem on my 1.8 i have to rev it up for it to shift some times from 1st to second .wen warm runs fine sometimes is this a tranny problem cud it just b filter??i have a code that comes up help
Odd refueling issue where it kicks off the fueling hose (like the tank is full) - charcoal canister? Any ideas?
Hi Peter, often times the charcoal canister is a culprit, damaged or bad vent tubes can also cause this as well.
1.8T never lose. This dude is def from QUEBEC
The most powerful 1.8t was 240 hp on the tt sport
TT clubsport, very rare car.
Also he mentioned that the first car with this engine was Golf mk4 but, actually it was A4 back in 1993 or 1994, couple years before Golf.
Anyway he definitely knows more about this engine then me 🙂
Not all 1.8t cars have check engine light, unfortunately
Hello. Can you explain is IT possible that Oil mixing with coolant liquid inside turbo K03?
That would be very unusual, but if it is truly happening inside the turbo, it would be an issue of the seals inside the turbo.
mk7 gti motor please!
Hi, just found your video. I just picked up a 2018 VW Golf Alltrack with only 17,123 miles from Carmax Interior and and paint are in excellent condition, but after driving it for a day, I notice a slight smell antifreeze when lift the hood and looking closer at the engine I can see on leftside front valve cover, some kinda red sticky liquid. Not sure why a 17k car would have that. Other than that, love the car, so any input would be helpful. Thanks
Hi Edward. congrats on the new buy! It is possible they topped off fluids/checked them before the sale, and made a bit of a mess. We would advise cleaning up the residual on the engine, using some all-purpose cleaner and a towel on a cold engine. From there you will want to monitor and see if the mess comes back. It would also be a good idea to make sure your caps are tight and secure on your reservoirs!
@@fcpeuro solid advice.
My Passat doesn’t have a timing belt. Did you mean the serpentine belt?
Is this the same 1.8T 20V engine in my 2004 New Beetle Turbo?
Yes
Same engine code? Its the same. Different engine code it can be simmilar
@@StopTeoriomSpiskowym thank you!
I remember that old vw / audi engines .Peoples have a lot problems with them .All time have to fix something and in that time was very expensive . It seems that engine is one great shit .😂Good for mechanicers 😂
I have a 1.8T in my '99 Passat. Is this the same engine just turned sideways? It looks similar but hard to tell for sure.
Yes.
Yes, depending on the model the 1.8t engine was either mounted transversely or (in the passat, a4, a6 and superb) longitudinally.
@@fabium3410 Thank you, good to know. I have 180,000 miles on my car and have had NO ISSUES at all with this engine. My oil analysis every year or so comes back as being a 'like new' engine. I am very happy with this engine and it gives me terrific mpg's too!
@@aboyandhisdog im happy to hear. It is a good engine all things considered. My first car had a 1.8t (98 a4). Just replaced general wear items and it never gave me much trouble, well the turbo did go bad after 280k km (not sure in miles) but it was an okay job even for a novice diyer like myself. Now i drive another 1.8t powered vehicle which is a 99 tt 225 and its simply brilliant for what it is
You have an 058 engine, while (I think) all of the MK4 VW 1.8t's are 06A blocks (at least in the US). The later year (2000.5+) B5 (your Passat) and B6's are also 06A though, but your '99 would be a 058. A lot of the info in this vid only pertains to the 06A. Biggest difference between 058 and 06A short blocks is how the oil pump and water pump are driven. 058's uses an intermediate shaft to run the oil pump (instead of a sprocket directly off the crank snout like on 06A's), and the water pump is external and driven by the accessory belt (instead of internal and driven by the timing belt like on 06A's). Accessory bracket (ie; for the AC compressor, alternator) is completely different. Some different hose routing. Also 058's have no combi-valve or secondary air injection. Likely old-school cable throttle body instead of drive-by-wire, but if it's a later year '99, could be drive-by-wire. 058's all use narrow-band O2 sensors (outside of a conversion), while most but not all 06A's use wide-band. Different heads: you probably have the more desirable large-port AEB head but no VVT. Intake manifold obviously looks very different. In truth there's a dizzying array of changes to the 1.8T from car to car and sometimes year to year within the same model, but these are the bigger ones off the top of my head.