Lean Condition and Misfire Troubleshooting - VW/AUDI

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2008 VW 2.0 FSI Turbo (GDI system) with a misfire under load and intermittent high and low idle speed complaint. In this video I will show you how to read and interpret measured value blocks (MVB) 32 (LTFT) and 33 (STFT) as well as testing the ignition coils to determine if they are what is causing the misfire.
Trouble codes found in memory are: P2279 (2259200), P0304 (197632), P0507 (329472), P0303 (197376)
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On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!
Disclaimer:
Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.

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13 мар 2020

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Комментарии : 342

@cristiancanales7709 4 года назад

i work on diesel engines and yet its amazing how applicable everything i have learned from ScannerDanner is on that field as well , like Danner always says "fundamentals"

@alieutaal459 4 года назад

It's always fun watching you work on euro cars. I almost fell off my chair when you asked for help to remove the coil and also Pete handing you over the hot coil was gold. The things we find simple and easy like pulling off engine covers you find difficult lol. By the way the measuring value blocks applies to VW Audi Lamborghini Porsche. It includes Skoda and seat but don't think you have them in the states. Thanks for the video.

@LynxStarAuto 3 года назад

You don't understand, coils on VW are no joke. They stick real good. They actually make special tools to ease their removal.

@abdul-kabiralegbe5660 Год назад

@@LynxStarAuto Just so they can save on bolts, right?

@ScannerDanner 4 года назад

Just wanted to put everyone at ease. This video was filmed last year and my head cold has been long gone. I do not have the coronavirus 🙂

@rs1971camaro 4 года назад

Hear anything about shutting down Rosedale tech for a length of time?

@ScannerDanner 4 года назад

No official word yet

@cristiancanales7709 4 года назад

@@ScannerDanner yeah , u had me thinking about that cold?? just kidding , another great video my friend.

@richardcranium5839 4 года назад

corona is bad but that iron city will get ya too

@8953147 4 года назад

Stay healthy we need you Paul, God bless you and your family!!

@ibriheemabohlel4518 4 года назад

Thank you . You are my teacher. Learn a lot from you. Greetings to you and your son. Caleb, your brother, and your family as well

@gixxercorona 4 года назад

Great to watch Paul 👌🏻 a masterclass , never get bored , everyday is a school day in vehicle mechanics ❤️

@ScannerDanner 4 года назад

Thanks man

@robertmedina6875 4 года назад

Another great video Paul! I am studying on your premium channel and have learned soo much! Being a member of the premium channel , I was able to fix a short to ground in the DRL / head lights! I can't thank you enough!

@ScannerDanner 4 года назад

Thank you Robert!

@mbs5328 4 года назад

Thank you, Mr Danner. It's very helpful to know that stupid stuff happens to everyone, even the pros, when working on cars.

@mohamedrahib7685 4 года назад

Thanks Paul another great lesson . I like it so much asking for help is a sign of strength not for weakness,this also is a lesson for those who won't to ask for help when they don't know how to fix something.you are a great man. Here in Morocco the german's cars are number one

@nicknicu1787 4 года назад

Great video Paul! Those PCVs go bad all the time on these cars causing a vacuum leak. As a matter of fact, if you were looking for a silver bullet that's the first thing I would've told you to check. The coils go bad often too, good call to change all of them. Thanks for all you do! 👍👍👍

@DeadEric78 4 года назад

willkommen to VW... I feel much better watching you struggle with them as much as I did my 1st few go arounds. 5 or 6 VWs summed up in 42 minutes. In the end, your fundamental teachings got me from parts cannon to 90% sure (unfamiliarity and lack of info being the other 10%) and doing the right thing for my customers. Spot on diag and excellent video. Thanks again for teaching me to be an upper tier diagnostician.

@metoon3092 4 года назад

Great Diag. Defined what and why. Guessing this car as most, suffers from major neglect. Thank You for the video!

@VoltageDropDiagnostics 4 года назад

Great diag Paul! I recently had a mercedes that I made a video on and the hardest part is finding the information that you need!

@ScannerDanner 4 года назад

Thanks PJ. This video was from the archives. You can tell, no cameraman or Caleb Danner edits. Wait until you see next weeks. It's our first 4k video and Caleb is a wizard now in Adobe Premier

@arthurfricchione8119 4 года назад

Thanks Paul. Think I'll stay away from VW's. Will check out tool page. Try to support all you guy because you share Artie ❤️

@crawdoogie Год назад

Good stuff. I was thinking WTF when you grabbed those huge pliers to "help" snap the connector on to the coil. Your reaction when you realized what you have done was classic and yeah I've "been there done that." Your videos are great and have helped an incredible number of people to fix their vehicles worldwide. Your total # of views for all your videos must be like 50 million +!

@ScannerDanner Год назад

🙂 it just checked and it's like 90 million lifetime views or something like that Thanks!

@stahuskies2539 4 года назад

I've got the same engine in my 2006 Audi A3. I swapped out the airbox for a CARB compliant/emissions compliant Air intake setup. That airbox is a total disaster of a design. Good video as always!

@SmittySmithsonite 4 года назад

That MVB blew my mind! First I've heard of that. I've worked on a few VW's, but none were drivability complaints. That's where I was introduced to the odd world of the TRIPLE-SQUARE socket! What strange engineering that one is! I've also sealed up a leaking vacuum pump by disassembling it successfully - the manual wants you to yank the transmission! NOPE, not today! LOL. My buddy is still driving it 4 years later, leak free and with strong brakes. Then I did an oil pan on a 1.8T Passat - that was NO FUN, let me tell ya. Lots of yelling, cussing and turning the camera off, lol. Your reaction to Pete handing you that coil was way funnier than you grabbing it, Paul! 😂🤣😂 Too funny! Great stuff as always, brother. 👍🍻

@shaynewalters4806 4 года назад

Good case study using 3 decent sources to prove .Nice to see everyone gets knobbled by a different situation than usual made me giggle !!but respect for what you do .

@MVS501 4 года назад

Good to see you tackling a euro box man well done 👍 Nice video 👍 new challenges are good for keeping your thought process sharp . Over the pond in the UK we’re used to these type of “euro boxes”😉 . The leaking PCV unit will probably mean renewing the whole valve cover with genuine parts (after market repair kits won’t last 5 mins) . Usually the plugs go bad & because the coils give a strong spark they soon track to the nearest ground path & once this happens they’ll need renewing as it damages the insulation & for some reason the coils have a metal sleve designed in which acts as a superb earth route (it might be a surpression design to stop the coil interfering with other components) .

@FourRingsAuto 4 года назад

The pcv is separate to the valve cover on this EA113 2.0 engine. Genuine parts are supplied separate to the valve cover. Simply bolts on with a few T20 screws. Common failure for the diaphragm to fail inside, hence the bubbling soapy water on top.

@forrmol 4 года назад

I learn from you Fundamentals...and I repair VW also.To bad I can't be yours student...only on RU-vid...Thks a lot for all hard work of teaching us..ALL my respect for you " professor ".

@ScannerDanner 4 года назад

Thank you so much

@FourRingsAuto 4 года назад

Paul, great video as usual. I remember you saying you had VCDS in a previous video you did with Tommy. I'd recommend using VCDS to get more familiar with MVB measured value blocks etc. On the later CANBUS diagnostic cars like this MK5, you can search for the value you want by its name or definition such as misfire counters.

@paullittle9695 4 года назад

Great video Paul, if anyone wants to know Volvo's use lambda values but not blocks to measure. They also have similar pcv traps starting 2005 up. There is a rubber diaphram inside that circle piece that tears. Makes a nice whistling sound lol

@markmalloy344 4 года назад

The 2.0L FSI engine is also known to suffer from valve cover failure due to a sticky or failed diverter valve. This leads to premature and often reoccurring pcv failure and excessive oil use. When changing the pcv it is advised to video scope the large square port in the valve cover along the left hand lower corner for cracks.

@hectorgarza6725 Год назад

Good thing you made it back to the shop can good show

@luismarty1685 4 года назад

Thank brother. Another crystal clear video.

@normangallant9879 4 года назад

any driveability issues should be test driven.That was my experience before my retirement.Very important in my views.Good job

@jeffhesse8415 4 года назад

Test drive before to verify customers complaint and gather any useful information the customer did not tell you or didn't know to tell you. Test drive after repairs to verify problem is fixed.

@normangallant9879 4 года назад

Yes test drive after repair is done also

@andrewwmacfadyen6958 4 года назад

Where there were multiple drive ability issue my policy was to get another tech or service manager to do the final test drive before signing off.

@jhauna1 4 года назад

Great vid Paul, do take more euro cars we all hav a lot to learn from them👍🏾

@Usmanthemecano 4 года назад

Great job! That pcv is reminiscent of the GM (Chevy Cruze) valve cover diaphragm failures. Sometimes customer will complain of a whistling noise upon acceleration on vw and Audi. Always check that pcv. It fails a lot. As far as covers breaking because stuck in grommets, well I've seen it on more than one make ... Great info on the mvb's! Positive leads needs to do more vids...not just diag ones either.

@AK-ck7cy 4 года назад

@markmacias8263 2 года назад

If it’s in your school budget, a dyno is a great tool. Most shops use them for tuning, but they are great for driveability . I use tuning software and techniques for driveability. I call it OBD III.

@johnj5985 Год назад

FSI is Fuel Stratified Injection. Good video!

@drivewasher 4 года назад

Hey Scanner Danner, welcome to our world!!! Put a spot of silicone spray or wd40 on the block post to assist in refitting and removing the cover rubbers

@matth9359 4 года назад

I love those intake bladders too. Just popped mine recently though!

@josephburton92 4 года назад

Good job. You gave me some motivation to fix my Audi I’m going out to the garage right now!

@marktirabassi7873 4 года назад

I hope it's not Corona virus

@Pablo_Automotive 4 года назад

Thanks Paul anoter great weekend for your videos

@nancylewis7142 4 года назад

Nancy was here, thank you for this video

@spin1275gt 4 года назад

Paul, because you dont know how somethings works. It doesnt make it a bad design. I pulled of hundreds of covers and coils with this design never had any problems with it. Nice video and diagnose.

@ScannerDanner 4 года назад

For sure. But we all bitch about things we don't know don't we? ;,)

@matth9359 4 года назад

I've had trouble with them too. First one I took off broke. I think by definition, a good design would make it easy and work well, right? Bad design.

@salvadorgutierrezr5914 4 года назад

Thanks for video , and good job scanner danner👍👍👍👍👍👍

@Turbotomass 4 года назад

No previews . like to be surprised. 😁 Awesome content as usual

@ScannerDanner 4 года назад

I like a good preview but you're right, this one was too revealing

@spelunkerd Год назад

Hi Paul. I saw this video a couple of years ago, but came again after a Ukrainian refugee friend asked me to look at his car, almost identical to the vehicle here. It's funny, I too struggled with that silly engine cover. This car is gonna be a fun project, probably as simple as swapping the PCV and replacing gaskets on the vacuum pump for an oil leak. Cheers!

@HouseCallAutoRepair 4 года назад

WOW this was a LONG one for you! (I'm tàking a break from editing... My laptop got an upgrade and I videod the process. I'm scheduling it for this Sunday morning. What a PITA!)

@joseorellana7952 4 года назад

Eres el mejor amigo...you are the best my friend

@fermate1991 4 года назад

excellent friend Danner thought that it was only me that happened to break pieces... LOL

@rotor676 3 месяца назад

Thx for sharing. fixed me right up. Love your channel. Your the best. You du man. Thx again.

@jesusayalaalvarado6561 4 года назад

very good video misfire troubleshooting vw

@maiafordegm9845 4 года назад

Muito bom o diagnóstico, parabéns.

@_JohnnySav 2 года назад

Great video!

@robertmoura7546 4 года назад

Hello Dan, I am from Brazil, we deal with lots of VW here and let me tell you one thing 90% of VW has that stupid cover over the engine it's a pain on the butt, don't feel bad about the broken cover we all do that at one time. let me if I can.... do not remove the grommet from the engine instead just put some Vaseline around the grommet, and it will slip in very nice. I like your channel

@steveguest8028 3 года назад

Great find this one Paul, had to laugh at you struggling to work on European cars lol but you got there in the end, thanks a lot brilliant as usual 👍

@ScannerDanner 3 года назад

Euro cars 🤢🤮

@shawtyel7503 4 года назад

Thank danner for vw material.we are not used to pry bar...special thanks to pete he's back

@ScannerDanner 4 года назад

He's not back unfortunately. I miss Pete. This was from a year ago

@lj2026 4 года назад

Thank you put a heater core in it i got it figured out today thanks

@user-io3hw7hx7q 4 года назад

Awesome outstanding job have a great time thanks

@khaniftikhar9225 2 года назад

Good demo thanks sir

@PistonShack 4 года назад

Thanks for the video.

@georgebonney90 4 года назад

I dnt really see alot of VW or Audi vehicles because of that i dnt kno alot about them,that's why these videos are so valuable to me so thank u mr danner

@jorgeriverasantiago5508 4 года назад

Its great danny, I like this video thanks.

@ScannerDanner 4 года назад

You're welcome

@mobreyngambi1052 4 года назад

i like your videos

@merintaha 4 года назад

Thank you, brother

@JOHNPHUFNAGEL 4 года назад

I thought you was gonna do a give away for that redline easy intake balloon last year? I gave up and had to finally buy one. LOL Great video

@ScannerDanner 4 года назад

too much red tape for giveaways buddy, sorry and I just don't have time to focus on that like other creators do

@chrisi1909 4 года назад

Paul the MWB 14, (Sum) 15 (Cyl.1-3) & 16 (Cyl.4) are your Misfire Counters - The S5 GDI you did has the same style Coils (no screws)

@FourRingsAuto 4 года назад

Agreed on the misfire counters.

@uncommoncents9884 4 года назад

Crappy coils or do the coils commonly brake down because of the lean conditions these cars are known to have? I've seen so many techs go straight for the misfire and look over the lean condition which likely caused the misfire it's good to see a pro start at the right place and get both the cause and effect... love the videos

@MasAUS 4 года назад

PCV valve breather or actuator Nice video 👍

@nathanburke1993 4 года назад

The comment on having to work them regualry to be able to work on them rings true. I work on the euro brand of PSA citroen and Peugeot (which the US will see soon with the current FCA merger bringing jeep and chrysler to the mix) And they do things backwards all the time

@TheOffroader7458 4 года назад

Hi Paul put the rubbers back on the air box and put some grease on the rubbers before you put the air box back on and it will come off easily next time. All vw , Audi have air / engine covers held on this way

@thirdeye530 4 года назад

When those covers are hard to get off, I have always sprayed WD40 on the passenger rear grommet and work it until that corner pops up. Then wiggle each corner slowly until they all pop off. I'm going to try the pry bar method next time.

@PositiveLeadDiagnostics 4 года назад

Good job Dan

@ScannerDanner 4 года назад

🖕🖕🖕🤣

@meking115 4 года назад

So much for being a VDUB mastertech, I think the cover broke bcuz u didn't loosen the clamps & MAF wiring

@canadatransistor 4 года назад

Chevy cruze gen 1 have a similar system to where you have smoke billowing out. It acts as a vacuum regulating diaphragm. They rupture and causes leaks. The cruze has a pcv component inside the intake manifold. It also has check valves in the corrugated hose for boost pressure back to turbo. When this happens the transmission will likely act up because it's hunting to keep the engine from stalling so it surges. It's a super interesting topic to study.

@pissysoles6996 4 года назад

It's always a sad day when you look in the back of the intake and find that the little red valve tip is missing..

@andrewwmacfadyen6958 4 года назад

MG used a very similar set up decades back the rubber diaphragm would crack but in those days you could replace the rubber.

@mikeyg4297 4 года назад

Had a similar fault on a 2008 mini turbo with a -25% fuel trim at idle ,after smoke test found a pin hole in plastic breather pipe

@rexluongo6470 2 года назад

Do you know if this tool will work with the verus? TECPEL CA-60 AC/DC current clamp transmitter probe 60A CA-60

@saddiquemohammad8702 2 года назад

Mechanic job every day new job good luck.

@willemajorwilliemajor476 4 года назад

Well done dan

@ScannerDanner 4 года назад

Paul :-)

@willemajorwilliemajor476 4 года назад

ScannerDanner hahaha Well done Paul.

@billrimmer5596 4 года назад

What about going OBD2 for fuel trim? Easier to check maybe?

@russ533mj 4 года назад

I've busted that god forsaken cover too.... A big pick with a 90° pops those coils up nice. 😉

@masterfastermasterfaster 4 года назад

FSI = Fuel Stratified Injection

@Benbou969 4 года назад

FSI - F stands for Folkswagen (or other german word).))

@masterfastermasterfaster 4 года назад

@@Benbou969 wrong it's the heterogen mixture in the cylinder

@scientist100 4 года назад

Checking computer signal, power and grounds along with 5 volt reference (if used); wouldn't this be another confirmation that the coil is bad. What about the spark plugs? I had a bad spark plug once and it was misfiring, never seen a spark fail to the point where it was bad, visually the contacts looked ok but it was dirtier all around that the other plugs. The reason I ask this is because people say that the computer diode may go bad if switching around bad coils, in what scenario is this true?

@Ashroyer86 4 года назад

"sometimes ya need a prybar" LOL

@pantelis241 Год назад

Fuel stratified injection. These engines have a port flap in every intake pipe separating the intake in two pathways, from up to down and on low rpms they are closed partial on the lower part, forcing the air to twist inside the cylinder upwards to the spark plugs helping the lean mixture to ignite ( note that these pistons on top are designed not flat but it has two recessions like pyramid style to force the intake air to twist with high velocity), at the same time engine injects the fuel directly in the cylinder in the compression stroke just before TDC. By these means achieves an non homogenized mixture (stratified) and saves fuel running pretty lean. Nowadays these engines are being replaced by the TSI. Great video Paul thanks for sharing. 🙏

@ScannerDanner Год назад

Paul 😉

@pantelis241 Год назад

@@ScannerDanner i have correct it 😉

@angelopatafio8347 4 года назад

Hey Paul great stuff can you ask tom where can i find a list of all the group numbers for vw/audi please

@jasonfoster8871 4 года назад

ross-tech website lists them

@kdautomotive1165 4 года назад

Would it have helped to turn peak detection on? I've had problems where ineould get a burn line but no firing line and as soon as I turn peak detection on and firing line shows up

@ScannerDanner 4 года назад

Not on a 20ms screen

@pritchy26HD 3 года назад

Next time with the pcv leak try to remove the oil cap and the engine will stall out due to full manifold vac in the crank case. I work for the AA in the uk and we carry coils,plugs and the pcv for them as it’s so regular

@user-sl4rk5zm1j 4 года назад

Hey Paul, do you notice you work ith less distraction when sick???? I ask because I've had this. Really awesome video.

@gooe9561 2 года назад

Had a 2019 Honda clarity the other day. Fuel trims pegged lean at 1.47, found ethanol content 70%. I suspect they went and got E85.

@pigeonsil240sx Год назад

i have these same coils on my nissan 240sx,i found the only way to get a secondary image on the scope was by getting a spark plug wire and hooking that to the coil and other end to spark plug then using one of those ignition wave form clamps on the plug wire.these coils are tricky otherwise. also with this being turbocharged any smoke when pressurizing system would be a potential boost leak and would never make sense to see smoke on a turbo engine, the only time ive seen smoke when pressuring the system was on aftermarket manual boost controllers that use a controlled bleed off so it take more boost to open the wastegate.I cant think of any other time a turbo engine would have a intentional leak. then again there are so many different systems i may have just never came across one yet

@isalmankhan1 4 года назад

WoW Amazing case study👍 Thanks for sharing SD👍 You're Awesome😎 I've a question, how to check these values if one does not have an expert mode scanner? & Stay Blessed Bro🙏

@ScannerDanner 4 года назад

Regular STFT and LTFT on global data I'm sure

@josemontes9050 4 года назад

Danner, I'm wondering if you glue the intake cover, good lesson.

@NoWr2Run 4 года назад

EPOXY

@HristovRumen 4 года назад

Classic case of a ruptured pcv diafragm. Not very common on this older gen engines to see failed coils, but it does happen I guess. More common on the tfsi.

@robertpope3619 3 года назад

VW and Audi repairs, sweet. Can we expect a Lambo in the near future?

@fortnitedaily1042 4 года назад

Hello sir, i have also a golf 5 gti, and have some problems for over a year and not fixing it. Can you help me with some advice? I can send the codes.

@LtBRS 4 года назад

I have to admit that I cracked-up when you called it, "a stupid car" when the condition was that of an ignorant technician admiditly not familiar with the car. Great vids though, keep up the good work.

@ScannerDanner 4 года назад

Ignorant technician sounds harsh lol

@LtBRS 4 года назад

@@ScannerDanner Naaaa, we're all ignorant at one point or another. It's the noble thing to admit it (as you did while admitting that you weren't as familiar with VW's) wherever it comes-up. Keep up the great videos.

@ScannerDanner 4 года назад

@@LtBRS true that!

@TonyRule 4 года назад

It is stupid to have a mechanism that isn't accessible for easy release and is hidden from view, as in the case of that integrated intake plenum and vanity cover that when removed leaves the grommets behind - that's just poor design. It's also stupid not to have coils mechanically fastened and that rigid primary side harness takes stupid and pointless to a whole new level.

@ScannerDanner 4 года назад

@Tony Rule Word!

@TG-ok4ty 4 года назад

What do you call that pump thing and where did you get it?? I want it for smoke machine, tired of using plumbers putty.

@ScannerDanner 4 года назад

Its listed on my tool pages (links in the description)

@johnbalderas1989 4 года назад

Now I'm curious could you see the same waveform with a broken plug or bad coil boot.

@ScannerDanner 4 года назад

Yes, absolutely! That is why I moved the coil

@mikechiodetti6737 4 года назад

European vehicles are different, good diagnostics! Can't get over that.....no bolts! Like the jingle used to say, "Volkswagon does it.....again!"

@iozel4633 3 года назад

Thanks as always for the video Paul - does your friend Tommy have a YT channel? Thanks

@2secondslater 4 года назад

I am an ex VW Master tech, now independent but still see a majority of Euro vehicles. Those PCV valves on VW and Audi, there is a vent hole on top of the PCV, first thing I do on them if they have lean condition and misfires is put my finger on the vent hole while monitoring idle fuel trims, if the trim improves, the diaphragm in the PCV is split. You gotta watch out on the TSI, TFSI, FSI engines after you fix the PCV, the fuel trims at idle can misbehave and show very lean (absence of oxygen in the exhaust from unburned fuel) and cold misfires and cruising misfires/surging can occur. This is caused by the intake ports and backs of the intake valves being clogged up with carbon. This occurs because the direct injection takes away the normal cleaning of the intake valves with raw unburned fuel that you see on port injected engines, it is imperitave that these engines have uninterrupted airflow into the combustion chamber because of the fuel burn strategy and very small amounts of fuel used during idle and cruise conditions (the S part of FSI if you will.... Stratified) Misfires on VW/Audi vehicles with a DSG transmission can feel like a transmission fault.

@2secondslater 4 года назад

Oh, clogged intake misfires can feel like an ignition misfire 👍

@2secondslater 4 года назад

Oh, another one, front or rear crank seal or both can start leaking after a PCV replacement due to the PCV sucking vacuum (and dust and dirt) through the seal(s).

@andrewwmacfadyen6958 4 года назад

Good info

@nateb.1568 4 года назад

This may be a dumb question, but what does a misfire feel like while driving? It is obvious when it is idling but I've never felt one while driving.

@zaheedbaksh9304 4 года назад

Thanks

@ScannerDanner 4 года назад

Welcome

@gautorepair 4 года назад

I feel so much better now. I thought I was the only person who extremely hate German engineering and breaks most of the plastic tabs on the connectors.

@thisisausername1265 4 года назад

Two very common VW issues. Usually to check for a failed PCV I'll lift off the oil cap and see if it tries to suck back down. My preferred method and a quick way to check for failed internal PCV valves. Anytime I run into something for a check engine light or driveability issue and it has this dumb internal PCV design I'll do this test. It's made short work of more than a few misfires and lean codes.

@jdemara 3 года назад

If the pcv system is functioning correctly, should it try and suck the oil cap down when you lift it off?

@thisisausername1265 3 года назад

@@jdemara Lightly, yes, it will have a small amount of vacuum under it. When the diaphragm has failed, and there's full vacuum in the crank case, it will nearly suck the cap out of your hand. You'll also hear a drastic change in engine pitch, as you've just allowed for a massive vacuum leak. I've had vehicles where the vacuum was so strong due to the failed PCV system, the cap could not be removed while the engine was running due to the strong suction.

@rachet01 4 года назад

I heard you say that you were getting smoke from the dipstick tube as well as the pcv valve. Did you replace it as well ? Over time the plastic gets brittle & they break. That will give you a vacuum leak as well. The other way to see if pcv diaphragm is bad is to try taking the oil cap off. If it's hard to take loose & the vacuum trys to pull the cap back down, it's 100% bad !! I got a kick out you trying to figure out how the coils come out !! ;)