EVAP-Evaporative Emissions System Operation, Testing, & Diagnostics Beyond the Leak (P0442, P0455)
Vložit
- čas přidán 12. 07. 2024
- Email me at ( Michael.Becker@WellsVE.com )
The evaporative emissions system can be a tricky system to diagnose; With its generalized codes and components spread across the entire length of the vehicle. In this class we are going to start with a base level of EVAP understanding and expand from there. We share best practices and ways to work smarter, not harder! Don't miss out!
If you like what you see please like/share/follow. - Auta a dopravní prostředky
That 'little guy' must be big enough to help his Dad in the workshop by now surely ? 🙂 Thanks for all the great content that you put out, well appreciated and very helpful 😎👍
I came here after a shout out by Eric O on one of his videos. As advertised, this is the best seminar I've ever found on this topic. Thanks Mike!
Thanks man! That means a lot!
Mike Becker, Technical Services Instructor
Impressive! Love your one of a kind evap system. Now everybody should understand how EVAP system works and thanks to you!
Thank you so much Mike finally I can understand the EVAP systems much better this video is amazing priceless!!
Incredibly well put together video. A perfect combination of theory of operation and visual. Keep up the great work.
Hey P Lauj, thanks so much for watching!
Mike Becker, Senior Instructor
This is the best video I have ever watched on the design and operation of the EVAP system. Everything is now clear. Well done and thank you.
Thanks Andrew! That really means a lot to me! I'm glad everything about EVAP is clear!!!
Mike Becker, Technical Services Instructor
Best video about evap on youtube ! I learned a lot with Paul Danner, Eric O and Ivan videos. Yours is the icing on the cake !
Hey Didtok! Thanks man! That means a lot to be mentioned with the group of great guys!
Mike Becker, Technical Services Instructor
Thank You Mike for all your work in educating us. You must feel very proud when another
great diagnostician as Eric O recommends watching your videos. Keep up the super great
work!
Hey Enrique, thanks for watching! It is a good feeling for sure. The automotive community sure is a great one!
Mike Becker, Senior Technical Instructor
GC vu
Wow, great instructor. All the information needed to help keep my vehicle engine light from going on. You saved the day. thanks again.
Hey Diego, thanks for watching! That's great to hear!!!
Mike Becker, Senior Instructor
One Million Thank You’s for sharing this!! 🙏
I enjoyed your enthusiasm with teaching what you know and may you be blessed for this gift that you give to us. Thank you for your dedication to the art of FiXing what doesn't work and why. Don't worry about the length of the video.
Thanks Michael! Glad you enjoyed the class!
Mike Becker, Technical Services Instructor
Hey Mike great explanations ..Love the in depth testing using the bench set up .Thanks for making it so clear to understand.
Thanks Martinguitarhd28!!! I do what I can to make it easy to understand for everyone! Many times that involves a bench demo, because the car is a large piece of real estate...it's much easier to see the system as a whole when it's on the bench in front of you, right?
Mike Becker, Technical Services Instructor
I am so glad you showed us in a perfect and accurate way
Keep up the good work
Best of luck
Hey Mir Jaff, thank you very much!
Mike Becker, Senior Instructor
20 minutes in and this is already incredibly helpful for diagnosing an evap leak on my Mazdaspeed6. Thanks for the video!!!
Hey Denis, glad it could help! Did you get the problem fixed?
Mike Becker, Senior Technical Instructor
Thank you for making this educational video. It really helped to understand how the evap systems work and how to troubleshoot for issues. Subscribed 👍
Wow. I don't know Wells, and didn't even know I needed a dive into the EVAP system, but I clicked and then subbed 20 mins in based on this incredible work. Though Mike isn't totally comfortable in front of a camera n this video, my college and high school auto tech instructors should be made to watch this video as a demo on how to friggin teach concepts and model them so they can be like Mike. Glad I clicked.
Interesting training you provide. I have already seen the issue with 3 different vehicles that I am troubleshooting and have fixed 2 of them since watching this video. Again awesome presentation and thanks so much for these. I now have more knowledge to be dangerous :) !
Hey Mark,
Keep going! You will be a EVAP pro in no time!
Happy Wrenching!
~Ryan
Thank you for this course. I'm not a mechanic (I'm DIYer) but this helped me solved the issue my mechanic was not able to solve keeping my car in his shop for 8 days.
2008 Subaru Impreza 2.5i MT 5Dr here. Had my gas tank fixed at a radiator shop (a nipple from tank rusted out and broke off. Tank leaked gas through that broken nipple). They dropped the tank and rewelded a new nipple. But upon reinstalling everything, a "Check engine" (P0447 Vent circuit open) popped and they could not fill up the gas tank (the fuel gun would click off repeatedly). In the end, they ended up drilling an internal rubber hose inside the tank (hose that goes from the in-tank fuel vent valve to the tank nipple for the evap hose E (that Evap hose E is then connected to 2 other hoses by a T-fitting. One hose goes to the canister drain valve and the other hose goes to the pressure control solenoid valve). They though drilling that hose would bypass a potentially faulty fuel tank vent valve (they said they thought it was stuck closed, causing inability to fill up gas). But the mechanics could not solve the check engine P0447.
So I took my car home, unplugged the canister drain valve and found out that when they replugged the electrical wire connector to the drain valve, they bent the two electrical tabs pins so the circuit to the canister drain valve was opened (not energized). I straightened the metal tabs, replugged the drain valve correctly, and started the car. Now the check engine and P0447 code are resolved !
So I wonder if an off-circuit drain valve could cause inability to fill up the gas tank (full pump gun would click off all the time) ??? I know it's supposed to be normally opened but I still wonder about this.
The other thing I wonder is, since they drilled the in-tank hose going from the fuel tank vent valve to the nipple of the external evap hose E (evap hose E leads to canister drain valve and to pressure control solenoid valve via T-fitting) in an effort to make it so that they could be able to refill the tank (bypassing the fuel tank vent valve thinking it was probably stuck closed explaining the fuel gun would clicking), could liquid gasoline actually escape the tank by the drilled hose and get inside the evap hose E and damage my canister drain valve or damage my pressure control solenoid valve ??? I'm no mechanics, but I thought about this for days, reading my service manual and trying to understand evap systems.
In summary, if the badly reconnected canister drain valve was responsible for inability to fill up the gas tank, then my mechanics drilled the in-tank hose for no real good reason. I'm just concerned that drilling that hose (to bypass the fuel tank vent valve) could lead to gas flooding of the canister drain valve and/or pressure control solenoid valve. Are these valves resistant to gasoline fluid or are they only capable to handle gas vapors but not liquid gasoline ?? In the end, I don't want further problem down the road and than in-tank hose that was drilled (inserting the drill bit though the nipple) is not replaceble (impossible to access as it is very deep inside the fuel tank). They only mentioned to me that they drilled it after the fact, so that kinda sucks. But if you tell me it's not likely going to be an issue in the future, I'm going to have to replace the fuel tank completely with a brand new one (not repairable).
PICTURES HERE TO HELP OTHERS: www.toronto-subaru-club.com/forums/showthread.php/211637-Deciphiring-the-2008-2014-EVAP-system-hoses-and-where-they-connect?p=1704954#post1704954
love the video, actually helped me get the right diagnosis for my car, purge valve for my 2010 mercury mariner was stuck open! thank you! just future reference, the video was so quiet i had to have my volume all the way up and those ads killed my ears 😂
but thank you!! love this channel
Stellar work. Fantastic communication skills. I like how you are not the least bit arrogant, despite your high knowledge.
Thanks so much for taking so much pain n putting humongous efforts ......THE BEST tutorial on EVAP system 👏🏻👏🏻👏🏻👍🏻
Wow thanks so much!!!
Mike Becker, Senior Instructor
Your the best man! I love this channel thanks a million for explaining this in full detail.
Great presentation. Very informative and thorough. Thanks for taking the time.
Hey Mike, thanks! Thank you for watching!
Mike Becker, Senior Technical Instructor
HANDS DOWN THE BEST INFORMATION OUT THERE. THANKS 4 SHARING
Thank you so much Tweek!
Mike Becker, Senior Instructor
The best info about EVAP system I found, thanks
Hey J Flow, thanks man!!! Glad you enjoyed the class!
Mike Becker , Senior Technical Instructor
Incredible presentation Mike. Top notch. Thanks!
Thanks John! Thanks for all of the comments and questions!!! Have a great weekend.
Mike Becker, Technical Services Instructor
Baxrok2 hhh
Diana Portillo Guzman b
i watch this before each evap problem that comes in i don';t have many of them but this makes it so easy when i do
Very well explained. Very much enjoyed watching this. Thank you Mike. Cheers.
Hey, thank you very much :)
Mike Becker, Senior Technical Instructor
A+ for teaching young and old technicians how the EVAP monitors work!
Very helpful video! Thank you for your hard work, and for keeping our world clean! :-)
Thanks for watching Dean! Glad you found the video helpful!
Mike Becker, Technical Services Instructor
This is the most awesome video on the evap system!!!! Thanks for sharing!!!!!
Another great training video. Thank you Mike!
Hey Dylan, Thanks!
Mike Becker, Technical Services Instructor
It can't be emphasized enough the importance of understanding how a system or component works to accurately diagnose any issue. Before doing any test research how the components and system work. The days of guessing and replacing parts is a primitive strategy that costs time and money. Understanding then test. Don't guess. Outstanding video!
Thank you for the great video. I really like your presentation style and affect. Eric O recommended this video on his channel. thanks again.
Wow, by far the best EVAP video on the net I've seen. Subscribed!
Hey Ninpo1500, thanks! That means a lot!
Mike Becker, Senior Technical Services Instructor
Brilliant! just excellent, good job man, thank you.
Hey Clint, thanks for watching!
Mike Becker, Senior Technical Instructor
Thank you Mike I`ll keep watching.
Thank u for taking your time to make the cool rig, I enjoyed and appreciate your work ❤
first video I have watched of yours. fantastic, great presentation. really boasted my knowledge!
Hey Shaun, thanks for watching! Glad you liked it. Please be sure to check out our others and let me know what you think! Also, I am always available to answer questions/comments. Don't hesitate to reach out!
Mike Becker, Technical Services Instructor
I have to say I enjoy watching your videos. I found you to be informative and. professional . Your lessons are fantastic as well entertaining...I learn a lot by watching them . I thank you for sharing and taking the time to make them..
Thank you so much! Looks like you're enjoying the old stuff :)
Mike Becker, Senior Instructor
this is so good, amazing content. Loving it
thank you very much for this clear explanation
I wait more from you
Thanks for watching Salem! I'm glad you enjoyed the class!
Mike Becker, Technical Services Instructor
Best video yet on the topic
Muchas Gracias por la explicacion Mike! Now I know the function of each Vent and Purge Solenoid, I was wondering how the ECU works with Ground and sequences, thanks full for showing all your equipment, Thank you to all the WELLS team, regards.
Hey, thanks for watching!
MIke Becker, Senior Instructor
Very helpful video. Note that in the 2nd wiring diagram, the A feed isn't from the PCM relay output but rather is always hot and also supplies the PCM relay coil, so that appears correct. The first wiring diagram was wrong (showed A as the PCM relay output), at least for that specific car.
Hi Mike saw Eric O said to check you out for more Evap understanding, I have 04 Chrysler Pacifica my code that comes up is P0440. Not to much info on that code, but I believe I have a better understanding now. to test it out. It's the only code that comes up, so I'll be testing out what you have said on this video. And finish the playlist about Evap' so I can have the 04 stop with that code, thank you and the shop giving you the time and support to help us future Tech out and DYI guys. Thank you and the shop you are at. I have Subscribed to good knowledge.
Hey Mike, that's awesome! Welcome to the channel! Let me know if you need any more help diagnosing that Pacifica.
Mike Becker, Senior Instructor
Hey Mike thank you for these videos
Hey Johnny Appleseed, thanks for watching! :)
Mike Becker Senior Instructor
CONGRADULATIONS MIKE ! ! ! ! FUTURE TECH BEHIND THE WHEEL ! ! ! I missed the class this morning, will watch it now. Watched last month's training today also. Learned about the VE (Load) and Grams Per Second "formulas." Thank you for that.
Thanks MIKE!!!! Man, after being a tech for almost 10 years, I honestly lose sleep over the thought of him having to wrench for a living. Nothing wrong with it at all, but I how hard and frustrating of a job it is. I am hoping he does something with cars, but on a different level. Maybe like an engineer in a performance division, like SVT or Hennessey or something along those lines. But, like people have already told me, it's all his choice. Who knows, maybe he'll be a career politician, or an astronaut haha! Thanks, as always, for watching Mike! You have a great weekend!!!
Mike Becker, Technical Services Instructor
Thanks for a GREAT video. !!!!
Thanks Robert!! Glad you enjoyed it!
Mike Becker, Technical Services Instructor
Thank you ! Appreciate your videos. 🙂
Hey, thanks for watching!
Mike Becker, Senior Instructor
awsome vid. Thanks Mike!
Thank you very much!
Mike Becker, Senior Technical Instructor
Thanks for the video. I have a 2007 Sub with only 74 miles. Check engine light turned on with OBD code P0446 (Evaporative Emission System Vent Control Circuit 1/1. I've replaced the gas cap, vapor vent canister valve, vapor jumper wire and the Emissions Vapor Canister Purge Valve Solenoid EVAP Vent ( I don't think it's necessary but I did it anyway). Cleared it and the check engine light is gone but after driving 93 miles, the I/M is still not ready with a combo drive of city and fwy. Drove it for another mile and after 6 cycles, when I ran the OBD at 94 miles to see if it's I/M ready, unfortunately I see the same "pending" P0446 code despite driving it up to 110 miles hoping it will clear on it's own. So I decided to erase the pending code/OBD and did the same thing again. Drove it up to 92 miles without check engine, still not I/M ready and at 94 miles later it's still not ready and the "pending" p0446 code is back. Replaced the vapor vent canister valve, vapor jumper wire again just in case I have a bad part, but unfortunately pending P0446 code is back. I'm hesitating on replacing the vapor canister/charcoal cause I don't have issue filling up gas and no gas odor around the area too. Could it be the another bad vent valve? fuel tank pressure solenoid? I hope not... cause I know this is pretty common on the 2006 but not on the 2007.
Cleared it for the 3rd and 4th time, gas level is between 3/4 or 1/2 and the pending code is on after 10 miles but still not I/M ready. Should I just keep going and repeat the drive cycle until it clears or do I need to change the ftp and the VC charcoal too? I'd really appreciate yours suggestion.
wow.. really superb presentation.. thanks for nice vedio
Hello Mike, great video. Thanks.
Hey J Dell, thanks!!!
Mike Becker, Senior Instructor
Great video once again bro!
Thanks MrJoeyB!
Mike Becker, Technical Services Instructor
Hey Mike!!! At approximately 1:15 of the video, you could've changed the list to see other pids. Maybe you've learned this since filming. But just in case. And thanks for the shirt that you sent me a few months back.
Hey Tgodm1, i'm thinking your time stamp is off. Not sure what point of the video you are pointing to. Glad you like the shirt!
Mike Becker, Technical Services Instructor
I thought you might enjoy this true story. I had my little guy in my lap, 5-year-old I think, he is 44 now, so here is what I remember. We were in my 1964 Rivera with a 464 Buick big block. We were at a stoplight and the only other car in sight was a police officer, of course. My son, wanting to help drive pushes the shiny button closest to his foot. It was the Cruze control activating button, I know this sounds goofy but that year, and I am sure this was changed, but when you push that Cruze button the car accelerates to the dialed in speed, even when your is at a slow crawl like I was, as I was going from a dead stop to maybe 5 mph that is when my kid kicked in some new driving tips for me. The Cruze control was set at 80 mph, and by god that's how fast the car wanted to go. Of course, I hit the brake after doing a great burnout in the intersection with the cop behind me all the way to where I stopped, knowing the cop had a few questions for me. I told him what happened and his voice of wisdom was, Son next time read your owners manual, as he handed me a ticket for the burnout, that 465 or 464 can leave a lot of rubber on the road. PS MY FIVE YEAR OLD HAD A BLAST, CAN WE DO IT AGAIN?
Hey BillDude1313, that's crazy!!! I bet that car could leave some stripes on the road. Should have told the cop it's a community service, you're re-sealing the road :)
Mike Becker, Senior Technical Instructor
Hindsight 2020,
New subscriber here
Congratulations on your baby 👍
I wish I started in this industry earlier.
thanks mike great video very helpful....
Thanks for watching! Glad you've enjoyed the class!
Mike Becker, Technical Services Instructor
thank you for taking the time to make all these informative videos. i'm glad i found your channel. i wish more viewers show some support by liking your videos.
i didn't know what the heck an EVAP system was before this video. i got the basics of it after watching your case study. one thing i do not understand is how the EVAP system would deal with high pressures while the car is off. you mentioned EVAP systems are not sealed perfectly, but would the natural leak be enough to prevent possible errors from the build up of vapours by a car stored with a full tank of fuel over winter, for example? am i under estimating the resilience of the EVAP system components to pressure build up?
Hey Coldpillow, thanks for watching! Make sure to subscribe and click the little "bell" icon so you get notifications when we put a new class out. In a standard Purge/Seal system, it will always be vented to fresh air to prevent pressure/vacuum buildup. This is vented through the canister assembly and out the normally open vent.
Mike Becker, Senior Technical Instructor
Hello my friend Mike thanks for sharing keep up the great work bless day
Young man, you are very Good at diagnosis
Hey Mr. Charley, thanks for watching!
Mike Becker, Senior Instructor
Lot of information to take in. Will need to watch this several times .Great video
Hey Jay, thanks for watching! Glad you enjoyed it!
Mike Becker, Senior Instructor
Another Nice one Mike. Hope you're back training soon.
Congrats on your new born 🎉
Thanks, he's just over two now...time flys :)
Mike Becker, Senior Technical Instructor
@@GoTechTraining it does !!
Kids a great instructor wow impressive 👊🏻
Wow exelent Best teacher 💯👍👍
Thanks Mike The Best
***min **5:50***** "EVAP should be a money maker for your shop"...pause..."Let's leave it at that" loved it. LOL....that's why I'm here learning.
Hey Dewi, thanks for watching! So, after watching, you making money working on EVAP now?
Mike Becker, Senior Instructor
5:00 Oh go hug a tree, I'm kidding. Great explanation and great set-up model. I'm all about fixing instead of throwing away, trying to keep this giant rock with puddles clean
Hahah gotta make this rock last! Thanks for watching!
Mike Becker, Senior Technical Instructor
great teacher
Tremendous work love your puddin dance, rhymes n far most your humanity
Good video, learned a lot!! I have a HUGE problem with my Mustang, 2004/ 3.8 litre. It had a vacuumleak before I changed bigger fuel pump, 255 lph, but seems like now it got worse. I also changed throttle body much bigger, was 60 mm?? (OEM), now it is 70 mm. Also "check fuel cap" light used to come on, even I before did these changes. Of course, there was nothing wrong with fuel cap, replaced it anyway. So now, I have very high idle, like 2500-3000 RPM, for awhile, about 30 sec or so, and then idle comes down to about 1200, never goes lower/ normal. I know there has to be a big vacuum leak somewhere, because AC blows from vent, works OK, but when speeding, or under load, going uphill, it blows to window only, changes by itself??? Checked vacuum leaks visually, so far replaced EGR valve, EGR solenoid, Purge valve "front door", and will change purge solenoid valve tomorrow, already bought it!= rear door =). 12 volts coming to purge valve and solenoid, just cant find a leak. Bought cheap smoke machine, did not find anything, that test was not so great, has to do again with good smoke machine. I will take out purge canister too, and check, if it is leaking or if there is gasoline??/ inside?? How do I find that leak?? And get my idle down?? Also replaced TPS and IAC valve, they are all good???? Tired to throw money for this problem, and I don't seem to solve this problem!!! Any tests, I could do?/ Any ideas?? Thanks, appreciate your help, youtheman =)
Hey Eero, thanks for watching!!! Man, it sounds like you've spent a TON of money on this car chasing this issue. Honestly at this point I would recommend you take this thing in to a shop that you can trust that is good at diagnosis. There's a ton of things that can cause that high idle. Maybe intake gaskets are bad? Hard to say without seeing it with a scan tool and some testing equipment. I think at this point you're are going to be money ahead to take this in and have it properly diagnose!
Mike Becker, Technical Services Instructor
I have sprayed around intake gasket??/ nothing?? Otherwise car runs good, just drive me nuts, I don't seem to solve this, leaking problem?? Yesterday took out EVAP purge canister, tested it with pressured air, in a water, no leaks?? Also changed purge solenoid, "rear door", and 12 V seems to be coming into plug?? It is a big leak,...BUT I can't find it?? Smoke-machine?? Could it be intake manifold gasket??? Going crazy here.....
And, also, "check fuel cap" light came on already, when I bought the car, like a year ago, now it comes on every now and then, yesterday codes were: idle higher than expected....welll, don't we know it already =), EGR system problem, and big leak in EVAP system,...I just can't find it????
Eero, most likely your high idle problem and your EVAP problem are unrelated. You tested the purge solenoid, the one near the intake manifold, and that's not leaking correct? If that's the case you are most likely working with 2 different problems here. What are your fuel trim numbers? High idle, first thing i'm looking for is codes and fuel trims.
Mike Becker, Technical Services Instructor
How do you measure fuel trim numbers??
Thanks brother for all the time and effort you put in. Can evap leaks due to hoses or anything related trigger the o2 sensor 2 ?
thank you, your awsome
Great video Mike, I am dealing with a po457 and po455. it's on a 2001 Ford Focus. This video helped a lot. Lucky for me the customer and I have the same car just different year's. Thanks Mike
Thanks Greg! Glad the video could help! You need anymore help, just ask!
Mike Becker, Technical Services Instructor
Very good job bro
Thanks for watching!
Mike Becker, Technical Services Instructor
great info! for those of us who don't have a scan tool can you show a video of testing the vacuum pump module and the vent solenoid when you removed it from the car. So we can see which pins run which part. Mine has a band around it and you would have to destroy it to find out. Thanks, mine is on a 05 corolla PO43E code.
wowwwwwww! elcheapo! the hat ORRRRRR the T-shirt! dammit I don't wanna feel INComplete! gimeboth!
Haha sorry man you get neither! We only give shirts away when the class actually airs live. Join us for the next live class and you'll have your opportunity to win!
Mike Becker, Senior Technical Instructor
GREAT VID HAD TO WATCH AGAIN THK S AMIGO
Evap works at atmospheric .. tests itself by holding a bit of vacuum (when the CVS is on/closed..purge valve running). Smoke uses pressure. Sometimes it will hold pressure, but under vacuum, something is leaking, not allowing the system to hold vacuum. All assuming the canister is not clogged.
Hey David,
I agree and vice versa, sometimes it will hold vacuum but not pressure. I found that out on the LDP systems that use pressure for testing.
Thanks for reaching out and supporting the channel!
~Ryan Wilsing
Thanks for your help!!I just suscribe to your Chanel 😎
Hey Gustavo, thanks for watching and welcome to the channel!
Mike Becker, Senior Instructor
Great video and a lot of information to digest. Just to clarify, is the vent valve always open except during system leak tests by the vehicle’s PCM? A single P0455 code might lead me to believe a leak in the lines, connections, or gas cap. I have a P0455 code and my purge solenoid and vent value are both working fine. I did a blow test when energized/not energized on both valves.
Thanks Yo Me! Yes, the Vent is ALWAYS open on a standard system UNLESS the system is leak testing. A P0455 could be a lot of things. A leak code can also be caused by a lack of vacuum or a faulty fuel tank pressure sensor as well.
Mike Becker, Technical Services Instructor
@@GoTechTraining p
Wow great way to explain the system. Even i understand it now. I don't have a scanner that can comand the vent valve shut. From what im hearing you can apply you can jump the vent valve through the cars battery and shut it? You keep voltage on it so it will stay shut while your applying smoke to the system right? Im trying to find a leak on on a 2002 2.3 accord.
Hey Chrisvill54 thanks!! Yes, the vent can be applied with battery positive and battery ground.
Mike Becker, Senior Technical Instructor
@@GoTechTraining thanks i actually found the leak by doing exactly that. It was the vent valve not fully sealing fumes on my friends 02 accord. Thanks again!
Sweeeeet! Glad you got it!
Mike Becker, Senior Technical Instructor
@@chrisvill54 ...,..1
.
Great video, very informative. ..my question having the same code on my FJ-CRUISER is can't he charcoal canister be opened and repackaged wth clean activatived charcoal..any information would be greatly appreciated. .
Thanks for watching George! No, usually the charcoal canister is plastic welded together. They are one of those things that once you open it, you destroy it.
Mike Becker, Senior Technical Instructor
Enjoyed the comprehensive video!! Did u change the engine at the shop or?
Hey Bill, thanks for watching! Any long hour jobs I do at home. I can't tie up our shop here. Our engineers use it as well.
Mike Becker, Senior Technical Services Instructor
Seems like in your animated example of the Purge Test Mode (29:25) the direction of air flow through the vent valve should be the opposite of what is shown?? If the engine is purging the evap canister it will be drawing out whatever is in the entire canister, right? Otherwise the engine would soon pull vacuum inside the canister. What am I missing? Thanks
I had cod p0441 and p0455 large leak. I fix it was the EVAP canister purge valve, I remplace it and no more codes
That's great!
Mike Becker, Senior Instructor
❤🌹 God bless you 🙏🙏
Thanks for the very concise videos. Very helpful. Is it possible for a stuck closed evap valve to cause poor gas mileage?
Hey DynamicEQ, thanks for watching! Which solenoid vent or purge? If the purge is stuck closed the vehicle will never be able to recover the vapors from the canister. Highly doubt you'd see any changes to fuel eco from that. If the vent were stuck closed it could cause the tank to build vacuum or pressure and it would also be difficult to fill the car with fuel, but again...I don't see it affecting fuel eco in a noticeable way.
~Mike
Good stuff.
Glad you enjoyed it!
Thanks for watching!
~Ryan
good diagnostic. amigo
Thank you mi amigo!
Mike Becker, Technical Services Instructor
I watched a previous video with you and a P0455 DTC.You mention finding 12 volts on your meter across the terminals both on and off.I have one with 20 ohms on and 125k ohms off but my meter will still read 12 volts.It does not completely go OL and I cannot really find any specs.Is the PCM still seeing this circuit closed eventhough it is off?I find no leaks and the tank pressure sensor and both the purge and vent replaced
Nice to know. Good explanation.
If need help always apply.
Vytas Malcus
Hi! @Wells Vehicle Electronics And Mike Becker! My question is: Can a faulty EVAP system lead to a fuel pump failure?
Hey Argeny! I can't see how an EVAP system would cause a fuel pump to fail. Maybe under extreme circumstances, like if the system were to be plugged and pressurize. I guess that could somehow affect the pump...but I find this unlikely. Gut feeling says no. I don't think so...but i'm sure there is someone out there that can prove that it can. That's the fun of automotive, impossible to speak in absolutes!
Mike Becker, Technical Services Instructor
i replaced the purge valve and vent solenoid for a P0496 (High purge flow). Do you think i have a leak somewhere in the hose tube from canister to the purge valve? or just ECU issue
Ford Ranger 2.3 2007. Whenever i unhook the purge valve line going to the intake my truck drives normal but when i hook it back up and drive it will suddenly die and then start back and its a continuous situation. Well i wouldn't say die...i think i could describe it as no throttle response for a few seconds and then it suddenly has throttle again. The only thing i haven't thourghly looked at are the vent solenoid and the canister. Ive replaced the purge valve and fuel pump.
Excellent
Great video and very interresting right now. I had my car"2001 Kangoo 1,4 petrol struck by a violant fire. The fire started with a, not so loud bang, somewhere in the enginebays front, on the right side, or closeby, the same second as I tried to start the engine. In this location we find the charcoal cannister, and nothing else. Obviously, something flammable was igited after the bang, but what caused the bang. Builtup pressure in the Evap system, something finally gave in, charcoal cannister cracked, hose fitting failed? The evidence are gone. Any ideas?The weather has been very unstable and the car has been sitting for several weeks.
Hey Mike! Third time watching; what kind of gas is the one coming out of the charcoal canister? I know you said fresh air, but in the case I have a stuck open purge solenoid, how is this gas going to interact with my "normal" intake air? Is it going to be like inert gas just taking space in the combustion chamber or is it going to cause a lean condition? (This type of EVAP)
Hey, third time's the charm!? First off, we need to understand that the Canister has multiple ports. One going to the purge, and the other to the vent. The air from vent is "filtered" air. The air traveling to and through the purge is not "filtered" air.The purpose of the purge is to clean all of the stored vapors out of the canister. SO, the air traveling through the purge is very combustible fuel vapors, so, a stuck OPEN purge can cause rich concerns while emptying out the canister. Once the canister is empty of fuel vapors, then the car will run lean. Because it's pulling IN fresh air through the vent, through the canister, and through the purge. Does this make sense?
MIke Becker, Technical Services Instructor
Gotcha! Now I understand. The gas going through the purge is not air. That's why it's going to create a rich condition instead of lean. Mike, thank you, and thanks to Fritz too because I also watched it in Spanish. You guys are great!Thanks for the time and effort you take to present the seminars.
Exactly!!! Thanks for taking time out of your busy day to watch! Glad Fritz and I could help :)
Mike Becker, Technical Services Instructor