1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Cant work out why its misfiring HELP

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

  1. Jonesy
    Offline

    Jonesy Member

    Joined:
    Jun 27, 2004
    Messages:
    570
    Likes Received:
    1
    [Apr 12, 2011]
    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
    #1
  2. Ads

    Ads

    [Oct 21, 2014]

  3. s3dave
    Offline

    s3dave TFSI Hybrid Supporter

    Joined:
    Nov 11, 2009
    Messages:
    10,120
    Likes Received:
    729
    [Apr 12, 2011]
    Did you go for the recall? coilpacks breaking down dont always show on vagcom as there may be a weak spark
    #2
  4. beachbuggy
    Offline

    beachbuggy Well-Known Member

    Joined:
    Jan 27, 2010
    Messages:
    1,767
    Likes Received:
    140
  5. Jonesy
    Offline

    Jonesy Member

    Joined:
    Jun 27, 2004
    Messages:
    570
    Likes Received:
    1
    [Apr 12, 2011]
    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
    #4
  6. s3dave
    Offline

    s3dave TFSI Hybrid Supporter

    Joined:
    Nov 11, 2009
    Messages:
    10,120
    Likes Received:
    729
    [Apr 12, 2011]
    What make are the 2 replaced? not heard great success with cheaper unbranded coils esp with a remap
    #5
  7. s3 Hoggy
    Offline

    s3 Hoggy Whats going on???

    Joined:
    Apr 4, 2009
    Messages:
    1,657
    Likes Received:
    98
    [Apr 12, 2011]
    I had exactly the same problem was a coilpack, mine was on cylinder 4
    #6
  8. Jonesy
    Offline

    Jonesy Member

    Joined:
    Jun 27, 2004
    Messages:
    570
    Likes Received:
    1
    [Apr 12, 2011]
    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:
    #7
  9. s3dave
    Offline

    s3dave TFSI Hybrid Supporter

    Joined:
    Nov 11, 2009
    Messages:
    10,120
    Likes Received:
    729
    [Apr 12, 2011]
    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..
    #8
  10. Jonesy
    Offline

    Jonesy Member

    Joined:
    Jun 27, 2004
    Messages:
    570
    Likes Received:
    1
    [Apr 12, 2011]
    Thanks for the help. Ill pop to Audi on my next day off. Anyone know how much they go for?
    #9
  11. s3 Hoggy
    Offline

    s3 Hoggy Whats going on???

    Joined:
    Apr 4, 2009
    Messages:
    1,657
    Likes Received:
    98
    [Apr 12, 2011]
    around £35 now mate
    #10
  12. Jonesy
    Offline

    Jonesy Member

    Joined:
    Jun 27, 2004
    Messages:
    570
    Likes Received:
    1
    [Apr 12, 2011]
    cool thanks Hoggy
    #11
  13. Stanley
    Offline

    Stanley Member

    Joined:
    Aug 9, 2010
    Messages:
    201
    Likes Received:
    2
    [Apr 12, 2011]
    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 ;-)
    #12
  14. steve bain
    Offline

    steve bain Member

    Joined:
    Aug 16, 2010
    Messages:
    643
    Likes Received:
    0
    [Apr 12, 2011]
    maybe i'm a tight arse, bu get a pair genuine ones off bay for cheap. then go back for the recall? :)
    #13
  15. DaveA3
    Offline

    DaveA3 Audi A-Trizzle!

    Joined:
    Feb 25, 2010
    Messages:
    2,374
    Likes Received:
    14
    [Apr 13, 2011]
    **** it i would. try a different audi garage if theyve already seen the car
    #14
  16. Jonesy
    Offline

    Jonesy Member

    Joined:
    Jun 27, 2004
    Messages:
    570
    Likes Received:
    1
    [Apr 18, 2011]
    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.
    #15
  17. s3 Hoggy
    Offline

    s3 Hoggy Whats going on???

    Joined:
    Apr 4, 2009
    Messages:
    1,657
    Likes Received:
    98
    [Apr 18, 2011]
    good to hear pal!
    #16

Share This Page