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Cant work out why its misfiring HELP

Discussion in 'A3/S3 Forum (8L Chassis)' started by Jonesy, Apr 12, 2011.

  1. Jonesy

    Jonesy Member

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    Hey, basically at around 3000-4000 revs it will hesitate and seem to misifre for a second or so then carry on as normal. I just took it for a test drive and as it misfired, a puff of smoke came from the exhaust. First time i've noticed this, don't think it does it everytime.

    Car idles fine, and if I keep below 3000 revs drives brilliantly. I've recently cleaned the MAF, throttle body, injectors, replaced fuel filter and a few hoses that looked knackered also checked and tigtened everything up. Car was fully serviced about 4 months ago by myself.

    Vagcom says I have no errors except the low MAF signal from when I disconnected it, still misfired with it unplugged.

    I'm guessing if it was a coilpack or sparkplug it would show in vagcom and I would get the flashing icon on the dash. Only thing I haven't checked is DV but it sounds like its working fine.

    Any ideas guys?

    Allan
     
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  3. s3dave

    s3dave TFSI Hybrid
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    Did you go for the recall? coilpacks breaking down dont always show on vagcom as there may be a weak spark
     
  4. beachbuggy

    beachbuggy Well-Known Member

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    Coilpack.
     
  5. Jonesy

    Jonesy Member

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    I went for the recall last week, but unfortunately as my coils were not originals I was sent away empty handed. I know since I've owned the car I've had to change coils 1 and 2, as they misfired and gave me a vagcom fault. But 3 and 4 as far as I know are originals, so maybe Audi being lazy or just trying to mug me off!?

    Any easy ways to test the coils? If I swap them around will the misfire move to a different rev range?

    Thanks

    Allan
     
  6. s3dave

    s3dave TFSI Hybrid
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    What make are the 2 replaced? not heard great success with cheaper unbranded coils esp with a remap
     
  7. s3 Hoggy

    s3 Hoggy Whats going on???

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    I had exactly the same problem was a coilpack, mine was on cylinder 4
     
  8. Jonesy

    Jonesy Member

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    I'm not too sure on the brands, most probably from eurocarparts or vwspares. I guess a trip to Audi is needed again, i'm pretty sure the parts guy is getting sick of seeing my face i'm in their every week! :haha:
     
  9. s3dave

    s3dave TFSI Hybrid
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    With the puff of smoke you are seeing strongly suggests unburnt fuel from a partial misfire, so yes i would get at least a couple..
     
  10. Jonesy

    Jonesy Member

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    Thanks for the help. Ill pop to Audi on my next day off. Anyone know how much they go for?
     
  11. s3 Hoggy

    s3 Hoggy Whats going on???

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    around £35 now mate
     
  12. Jonesy

    Jonesy Member

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    cool thanks Hoggy
     
  13. Stanley

    Stanley Member

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    I've just fitted another coil to mine tonight. So far numbers 3 and 1 have gone in 6 months. Replaced with used VAG ones. Free of charge ;-)
     
  14. steve bain

    steve bain Member

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    maybe i'm a tight arse, bu get a pair genuine ones off bay for cheap. then go back for the recall? :)
     
  15. DaveA3

    DaveA3 Audi A-Trizzle!

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    **** it i would. try a different audi garage if theyve already seen the car
     
  16. Jonesy

    Jonesy Member

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    Hey, just a quick update. I changed coils 3 & 4 which turned out not to be original but some cheap brand, probably from ebay. I left 1 & 2 as they were fairly new anyway. The car has never pulled so well and the misfire has gone! Actually don't think its driven this well since I bought it. Anyway I'm happy again, thanks for the help.
     
  17. s3 Hoggy

    s3 Hoggy Whats going on???

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    good to hear pal!
     

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