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Misfire on s3 8p, Random multiple misfire / misfiring across all 4..

Pistonpete Mar 21, 2015

  1. Pistonpete

    Pistonpete Registered User

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    Hi, Ive recently bought this s3 8p and Im having trouble with diagnosing the fault. When driving on the motorway and staying at 70mph for a while the engine management light flashes on for 10 seconds or so then disappears. long story short, Ive had Vasstech take a look at it for me and they've pulled up all the fault codes and suggesting having the evap canister and breather valve replaced which cured it for a short while.

    Driving it around for another week or so the Enging management light flashes up again and stays on this time and the fault codes that have flagged up on vagcom are the following.

    P0300 - Random/Multiple misfire

    P0301- Misfire detected on cylinder 1
    P0304- Misfire detected on cylinder 4
    P0302- Misfire detected on cylinder 2
    P0303- Misfire detected on cylinder 3 (80% of the misfire is logged on this cylinder)

    can anyone help me or point me in the right direction of why all 4 would be misfiring, the misfire does not cause any sort of loss in power or change the way the car drives. It comes on when the cars been running for a while mainly on the motorway when it sits at a certain speed too long.

    Cheers.
     
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  3. NHN

    NHN Retrofitter - Audi - VW - Skoda - Seat Site Sponsor VCDS Map User

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    Common issues are plugs, coil packs that are under a recall from audi, but all 4 at once would denote a common across all 4, loom maybe faulty, not common tbh, but vasstech would check the obvious I'd hope.
     
  4. Pistonpete

    Pistonpete Registered User

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    Being across all 4 I'm stumped where to look next, Vasstech charge around £50 an hour to look through it all, How would I go about checking the loom myself? Just look for obvious burns or deterioration?
     
  5. SootySport

    SootySport Registered User

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    Coil packs have affected just about all VAG petrol cars recently, I wouldn't be surprised if all 4 of yours are playing up, especially if it only happens when they are hot. I would do as you say first and check all the ignition related wiring first. Have a look at all the related connector plug pins carefully for corrosion, looseness.
     
  6. mjr901

    mjr901 Guest

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    Check cam follower.
     
  7. Pistonpete

    Pistonpete Registered User

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    Il. How would I check the coilpacks for deterioration other than signs of blackening or breakdown? Il check plugs and pins tonight too. Thanks
     
  8. Pistonpete

    Pistonpete Registered User

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    Since I got vasstech to clear the codes as the engine management light was stuck on, Ive since managed to get the light to come flash back on then off again re-recording the fault. Vag com does not identify the fault, so Ive rang audi Teesside and they say they use a completley different system which would identify the exact problem with the car and what component is at fault, I dont want to pay another £60 for them to tell me its missfiring across all 4 without telling me the component at fault, anyone work for audi here than can instill any confidence in me here..
     
  9. Ibisa3

    Ibisa3 Registered User

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    should we presume you've pulled the plugs/changed them ?
     
  10. SootySport

    SootySport Registered User

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    The answer is ----you can't. Do you know if the main dealer has changed them on a recall? The only way to see if they are at fault is by substitution. Apart from that you at the mercy of the main dealer or decent Audi specialist.
     
  11. Pistonpete

    Pistonpete Registered User

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    I havent inspected plugs yet but Il take a look. Ive literally just got the car in january 10th this year. Started having trouble with it from the get go and the garage I bought it from are being s#it about fixing it. I need to diagnose the problem first or take it to audi for a diagnostic and full detailed inspection report on whats wrong with it, take the case to trading standards and see where I stand with it all, then hit the garage with a letter from trading standards. If the problem is cheap to fix I dont mind biting the bullet to just repair it.
     
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  13. Pistonpete

    Pistonpete Registered User

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    I
    Ive rang audi and theres been no recalls on the car or notes to have it done.
     
  14. Ibisa3

    Ibisa3 Registered User

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    I had a nasty misfire on my 1.8tfsi when i bought it from the garage.
    It dropped a cylinder on day one.......

    i quickly diagnosed a coilpack, replaced and considered it fixed. Then another misfire developed, at tickover.......
    ( car supposedly serviced before buying it...)

    Pulled the plugs to inspect, and hey presto. Cyl 1 ( same as failed coilpack hint hint) plug was wrecked. end had been eroded right off.

    misfire cured...... plugs.jpg
     
  15. eagle75_1

    eagle75_1 Registered User

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    Hi,
    I have the exact same problem on my 2008 Audi TT with 2.0 TFSI Engine (bwa code). Have you already solved it? I have tried everything but the Problem still remains.
     
  16. samuelh_888

    samuelh_888 Registered User

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    Hopefully - it’s been 4 years since the post updated.

    Assuming you've tried new plugs and coils, do you have the current fault codes?
     
  17. eagle75_1

    eagle75_1 Registered User

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    yep, noticed that already.

    As I already said, I habe the exact same problem. The fault codes are
    p0300
    p0301
    p0302
    p0303
    p0304

    I already changed the spark plugs. But didnt touch the coils as its very unlikely if not impossible, that any of the cylinder specific parts fail at the exact same time. And if they did, you would definitely feel the engine running rough not idling smooth and loosing power.
    But its running perfectly fine, reaching top speed easily.
     
  18. nluk100

    nluk100 Registered User

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    Have you checked / replaced the usual culprits ... DV & PCV? They are relatively inexpensive and are DIY. Also, has your cam follower been replaced?
     
  19. ron burgandy

    ron burgandy Registered User

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    How hard is it to replace the cam follower?
     
  20. samuelh_888

    samuelh_888 Registered User

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    Only takes about 15 minutes - there’s guides on YouTube.
     
    ron burgandy likes this.
  21. eagle75_1

    eagle75_1 Registered User

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    I replaced:

    Spark Plugs
    Lambda Sensor before Cat
    High Pressure Fuel Pump with Cam Follower

    Next I‘m going to replace is the fuel filter which was already replaced last year.
    After that I‘ll try the knocking sensor but I couldnt yet finde out where it‘s located.
     
  22. ch1z64

    ch1z64 C'mon you's bhoy's in Green Silver Supporter VCDS Map User

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    Have you by any chance had your timing belt changed , just that I am having a misfire problem on cyl#2 and intermediate misfire 's all over and I recently had my timing done within the last 3months
     
  23. eagle75_1

    eagle75_1 Registered User

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    Got it replaced by the local audi dealership in 2017. Misfiring Problems started 2 months ago.
     
  24. ch1z64

    ch1z64 C'mon you's bhoy's in Green Silver Supporter VCDS Map User

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    Update on my problem ,I found once I replaced all spark plugs for new and got the Red coils my problem went and hasn't come back so far so good
     
  25. ch1z64

    ch1z64 C'mon you's bhoy's in Green Silver Supporter VCDS Map User

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    Well I thought my problem was solved but not , still getting misfires but now it is only intermediate so where do I begin
     
  26. doce

    doce Registered User

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    Is there any difference if the aircon is on or off?
     
  27. nch0

    nch0 Registered User

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    Any news guys?

    Ive bought my s3 few months ago with the exact same issues...

    Cruising at around 70mph and Eml blinking... Showing the exact same p0300, p0301, p0302, p0303, p0304

    Changed so far:
    Plugs, coils, injectors+ decoke(there was loads of carbon build up on the valves), cam chain, pcv valve....

    After all that I dont really want to sell a completely serviced car...
     
  28. desertstorm

    desertstorm Moderator Staff Member Moderator VCDS Map User

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  29. doce

    doce Registered User

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    @nch0

    Did you check cylinder head gasket? Also, have you noticed any whitish solids on and around old pcv valve?
     
  30. ch1z64

    ch1z64 C'mon you's bhoy's in Green Silver Supporter VCDS Map User

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    Firstly check coils and plugs . I have recently found out on how to check my timing is ok as this is one cause off misfire / misfires.
    Firstly if you have or get get someone to do for you , is go into Vcd's and go to #1 module engine then proceed to measuring blocks # 91 and look at both blocks and your timing should sit around 28kw/28kw @ idle . Then await car to come to temp and then floor the acc pedal ( make sure in neutral ) and see if both blocks move if so timing should be fine . Then you can at least rule that out . Then if you want read up on ( understanding fuel trim YouTube ) then you can check them on vcd's and see if that rules another bit out , then there will be certain pressure testing that can be done for leaks .
     
    nluk100 likes this.
  31. nch0

    nch0 Registered User

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    I dont have strange residue in my oil, didnt really noticed any coolant loss.
    Didnt saw anything wrong with my old pcv either.

    First I bought NGK from eurocarparts then few months later amd tuning in essex changed them again(dont know where they supplied them from)

    First thing was to test the car for vacuum leaks and been told that there are none. Months later amd tuning(essex) said theyve tested fuel pressure and cylinders compression and everything seems fine.

    Along the lines Ive changed the fuel filter which looked like it was never changed before (120k miles) and the manifold flaps when the decoke was done...
    Recently I saw a topic and people mentioned cranckshaft pulse sensor (my car some times need san extra second to start) was willing to change it myself, how ever I did not found an accurate information of where the sensor is. Does anyone know if theres a way to check if the sensor is not faulty?
     
  32. ch1z64

    ch1z64 C'mon you's bhoy's in Green Silver Supporter VCDS Map User

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    There is a thing called VCD'S which you can buy from a genuine outlet @NHN supplier and then register it with Ross- tech .com and there is heaps off info
     

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