Diagnosing a Cold Start MISFIRE on a Direct Injected / Fuel Injected Motor: Audi A4, A3, Passat 2.0

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  • Опубліковано 13 січ 2025

КОМЕНТАРІ • 56

  • @santiagogomez1664
    @santiagogomez1664 Рік тому +2

    Man you’re a life saver !!! Rebuilt my engine with help of your videos , just recently had a misfire issue and same thing it was an injector . Again used your video for help and again right on the money 🙌🏼🫡great work man

    • @beerwrenchgarage
      @beerwrenchgarage  Рік тому +1

      Santiago, so glad to hear that you got your problem solved and you found my videos useful. Good job figuring things out - hope you enjoy your car every time you turn it on, knowing you built that engine with your own hands! Thank you for the awesome comment - one of my absolute favorite comments I've ever gotten on UA-cam!!! 😁

  • @buyani9089
    @buyani9089 Рік тому +3

    nice video thanks can you give a link wher you bought your coils

    • @beerwrenchgarage
      @beerwrenchgarage  Рік тому +1

      Thanks for watching. Of course I can provide a link to my source for coils. I will also update the video description to reflect this info as well. I buy almost all my OEM Audi parts from Molle Audi in Kansas City. In this case, the OEM coils (part #: 06E905115G) were $48.43 a piece. Thats about as cheap as you can get OEM Audi coils anywhere. Link to Molle Audi is here: parts.kansascityaudi.com/

  • @advancedleveldiagnostics
    @advancedleveldiagnostics Рік тому +1

    Nice video, Thanks for sharing!

    • @beerwrenchgarage
      @beerwrenchgarage  Рік тому

      Thanks for the comment and thanks for watching! I'm looking forward to watching some of YOUR videos - there are some great learning opportunities on your channel!

  • @rudyperdomo4359
    @rudyperdomo4359 Рік тому +1

    Great video helped me out alot much appreciated

  • @marvindueck8148
    @marvindueck8148 Рік тому +3

    I Have the same problem, replaced the injectors, checked coils and plugs, and cleaned the valves. Still have a misfire on cylinder 3. Super frustrated at this point

    • @beerwrenchgarage
      @beerwrenchgarage  Рік тому

      Interesting. It seems like you've ruled out most of the major culprits. I would say consider doing a compression test and/or leakdown test to make sure that cyl #3 is sealing appropriately. If compression and valve sealing are good, the only other thing I could think of is that perhaps you have a small leak at the intake manifold - either a nicked gasket or the plastic manifold has a small defect.

    • @marvindueck8148
      @marvindueck8148 Рік тому +1

      @BeerWrench Garage yea it's just that it's only on a cold start which is weird.

    • @738megan
      @738megan Рік тому

      Did you figure out the issue? I'm having the same problem

    • @yanbaihuzxzxzx
      @yanbaihuzxzxzx Рік тому

      Replace the timing magnet and value spindle. Easy to fix and buy oem parts direct from vw. No auto parts stores.

    • @Wainz007
      @Wainz007 Рік тому +1

      Happened to me and it ended being that carbon build up on piston head.

  • @harveys.2821
    @harveys.2821 10 місяців тому +1

    On these Audis A4 is it possible to get a misfire cylinder 1 due to p0456 or charcoal canister, also I installed the esc running diver vale adapter could it be possible leaking thru the o-rings providing this misfire
    Best regard awesome vide man!!

    • @beerwrenchgarage
      @beerwrenchgarage  10 місяців тому

      Hey Thanks for the comment and view! I seriously doubt that a charcoal canister can cause a misfire as the purpose of the charcoal canister is just to absorb gasoline fumes/vapors from the fuel tank and should have no impact on the ignition sequence in the combustion chamber. The diverter valve may be more of an issue - I would say fix it for certain. However, to really address your misfires, you will need to scan the codes and get specific OBD II faults and go from there. You will also need to study your fuel trims. Good luck!

  • @harveys.2821
    @harveys.2821 10 місяців тому +1

    149,000
    But even compression tested out good and leak down will it still be. Possibility? Thank for the awesome feedback gives me hope and ground were to start

    • @beerwrenchgarage
      @beerwrenchgarage  10 місяців тому

      No worries! You'll get this figured out. So if compression is good - that rules out timing, a leaky head gasket, or bent valves - which is all good. One other thing I would check out is an intake manifold leak - maybe you have a failure of the gasket where it mates to the head or a small crack in the plastic somewhere. I would try to smoke test your intake tract/intake manifold. A small vacuum leak over the #1 injector port would cause an issue.

    • @harveys.2821
      @harveys.2821 9 місяців тому

      @@beerwrenchgarage I did your advice in smoke no leaks to be shown, I keep getting the P0456 small leak I’m took off the back seat and nothing it’s like mysterious Audi misfire

  • @maduxo
    @maduxo Рік тому +1

    Super helpful video. Thank you!! - DIY'er here. Got a 2008 VW Passat 2.0T FSI B6 doing the same thing, P0303 (cyl 3) on cold starts only, once I clear the code and it warms up it runs smoothly with plenty of power, and the P-code does not come back. Would clearing the code and running the engine create other issues even though the P0303 or any other code does not return? Thanks
    BTW... I should mention that this issue is still happening after I changed the sparks and coils to Bosch brand. The intake Manifold and injectors are beyond my skill level. :)

    • @beerwrenchgarage
      @beerwrenchgarage  Рік тому +1

      Hey thanks for the comment! It won’t hurt your engine to keep clearing the code at this stage. However, the performance of the injector will eventually degrade to the point where your car will start having significant misfires. At the point you will have no choice but to address the injector. Pulling the intake manifold, especially on the FWD orientation Passat 2.0 is not extra ordinarily difficult. If you have a junkyard nearby, you might want to go practice the procedure before doing it on your car. The hardest part of the procedure is usually dislodging the injector from the port on the engine - sometimes they get stuck real well.

    • @maduxo
      @maduxo Рік тому

      @@beerwrenchgarage
      Thank you for your reply and advise. Great idea about the junk yard. Thank you again for the valuable content. Best of luck on your YT channel.

  • @harveys.2821
    @harveys.2821 10 місяців тому +1

    Injectors were replaced Bosch, do they need coding maybe? Valves looked a bit build up of carbon that was my next move ruling out engine internal

    • @beerwrenchgarage
      @beerwrenchgarage  10 місяців тому

      Injectors dont need coding - at least for this generation.

  • @wanderor007
    @wanderor007 Рік тому +1

    Great work thx

    • @beerwrenchgarage
      @beerwrenchgarage  Рік тому

      Thank YOU for watching and commenting! Much appreciated.

  • @chesterodtuhan5315
    @chesterodtuhan5315 6 місяців тому +1

    I had hard time fore Elantra GT 2014 2.0 Cylinder 3 missfire P0303 (cold start only) sometimes P0300

    • @beerwrenchgarage
      @beerwrenchgarage  6 місяців тому

      If you’ve done all the basics, then certainly it’s time to suspect the injector for cylinder #3.

  • @harveys.2821
    @harveys.2821 10 місяців тому

    It was tuned intergrated engineering over a year took it off from stage 1 and ran worst
    Out it back on and runs a lot more better but just misfire

  • @harveys.2821
    @harveys.2821 10 місяців тому +1

    P0300 & p0301 and sometimes small leak emissions

    • @beerwrenchgarage
      @beerwrenchgarage  10 місяців тому +1

      How many miles on the engine? If its only ever P0301 - you should look at the injector - in fact if its a high mileage motor - pull all the injectors and have them sent off to be cleaned. Also, scrub the intake valves - carbon build up will cause misfires due to the valve not fully closing during its operation. I bet if you clean the valves and send the injectors off to be cleaned, you will solve your problem. Check out Mr. Injector in Idaho for that service. Good luck!

  • @harveys.2821
    @harveys.2821 10 місяців тому +1

    Fuel trims looks solid no spike during pulls 3rd and 4th gear must be an Audi mystery 😢

    • @beerwrenchgarage
      @beerwrenchgarage  10 місяців тому +1

      Lol. What codes are you getting exactly?

    • @harveys.2821
      @harveys.2821 8 місяців тому

      @@beerwrenchgarage got the p0300 & p0301

  • @jockobacumbo623
    @jockobacumbo623 4 місяці тому +1

    If it’s a GDI car. Possible or probable injector if not.

    • @beerwrenchgarage
      @beerwrenchgarage  4 місяці тому

      Yup. It is a DI car and the injector was absolutely the issue.

  • @jockobacumbo623
    @jockobacumbo623 4 місяці тому +1

    Watched first two minutes, I say carboned up intake valves.

  • @harveys.2821
    @harveys.2821 10 місяців тому

    Metal intake, new intake gasket as well

    • @beerwrenchgarage
      @beerwrenchgarage  10 місяців тому +1

      Are you running a tune? If so, who is the tuner and have you talked to them about this issue?

    • @harveys.2821
      @harveys.2821 10 місяців тому

      Yes IE tune stage 1 for over a year no issues , until now when I removed the injectors I noticed carbon but really didn’t pay much attention due to passing compression and leak test but seems carbon does have an annoying effect also heard of the crc valve cleaner and building hp octane to help clean off carbon . Or better walnut media blaster?
      Thanks!!!

    • @beerwrenchgarage
      @beerwrenchgarage  10 місяців тому +1

      @@harveys.2821 The CRC stuff wont work for DI set ups - it only works for port injected systems. TO clean the intake valves easily and cheaply, you should pull the intake and scrub them with a wire brush (making sure that the piston you are working on is up so you dont get debris in the cylinder). Also, if your scanner has live data/misfire counter I would monitor that to see what rate and what cylinder the misfires are occurring - might give a clue. My sense is your issue is due to unwanted/unmetered air (leak) entering the combustion chamber.

    • @harveys.2821
      @harveys.2821 9 місяців тому +1

      @@beerwrenchgarage when you say unmetered air , example like a boost leek or emissions?
      Thank you

    • @beerwrenchgarage
      @beerwrenchgarage  9 місяців тому +1

      @@harveys.2821 Unmetered air is any air that gets into the combustion chamber that is not accounted for by the Mass Air Flow (MAF) Sensor. This typically will throw off your air/fuel ratio and cause a misfire or lean condition and will likely be caused by a leak in the air tract somewhere.

  • @Maison3840
    @Maison3840 11 місяців тому +1

    My 2.0 fsi misfires .it has p0300 and 0303 changed plugs and coils still misfiring

    • @beerwrenchgarage
      @beerwrenchgarage  11 місяців тому +1

      Do a compression test. If compression is good on all cylinders (~175-200 psi) then pull your intake manifold and have your injectors sent off for cleaning (Mr. Injector) and clean your intake valves. Will likely take care of your issue.

  • @Skyisnotalimit
    @Skyisnotalimit 2 місяці тому +1

    Theres always a better way of doing things, sell this crap and buy a toyota corolla. You´ll get a car that works for gods sake. If there was several cars outside the shop in the morning, VAG´s and Japanese, the japanese was there to get a regular service, like oil and filters, the VAG pretty much was broken in some way, some of them got a tow there during the night. This was a common thing,.

    • @beerwrenchgarage
      @beerwrenchgarage  2 місяці тому +1

      Hey Man - you dont have to tell me twice. My daily driver is a Subaru and the backup is a Toyota. The Japanese cars are a treat to work on compared to the VAG cars. The VAG cars seem like they are engineered to torment the people that are working on them. Thanks for the comment!

    • @Skyisnotalimit
      @Skyisnotalimit 2 місяці тому +1

      @ Good to hear man, hope you’re doing ok. 👍🏻

  • @edgarmartinez3052
    @edgarmartinez3052 День тому

    Garbage video

  • @austinlancaster1303
    @austinlancaster1303 Рік тому

    But you still dont know what the actual problem was.

    • @beerwrenchgarage
      @beerwrenchgarage  Рік тому +2

      Did you watch the video all the way through? The #3 injector was not functioning properly.