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Bump on idle

Discussion in 'A3/S3 Forum (8L Chassis)' started by basscrazy, Mar 15, 2009.

  1. basscrazy
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    basscrazy Member

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    [Mar 15, 2009]
    a while now ive been having a bump on idle like its trying to missfire...I had a coil pack error up so presumed it was that

    Replaced coil packs all of them codes gone and its still there?

    When driving its absolutley mint never skips a beat but soon as you just idle it has this cough?

    Any ideas?


    cheers
    #1
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  3. basscrazy
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    basscrazy Member

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    [Mar 15, 2009]
    to give you an idea how well it drives were talking 34.9mpg when driving normally its just as soon as you hit traffic lights etc there it is
    #2
  4. c_dog
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    c_dog Member

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    [Mar 15, 2009]
    Maybe the throttle boddy needs cleaning\aligning? Sorted out my dodgy idle. There are some threads knocking about on how to do it.
    #3
  5. basscrazy
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    basscrazy Member

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    [Mar 15, 2009]
    if your under the car you can hear it allmost miss its strong enough to hear
    #4
  6. basscrazy
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    basscrazy Member

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    [Mar 15, 2009]
    throttle body has been cleaned re alined etc about 8 months ago? new maf as well
    #5
  7. c_dog
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    c_dog Member

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    [Mar 16, 2009]
    Would be worth getting VAGCOM to log for misfires. Although as I understood it a coilpack either works or it doesn't and there isn't really an inbetween. Maybe worth looking down that route, or see if VAGCOM throws anything else up!
    #6
  8. 1animal1
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    1animal1 The Clar!! it mouves!!! VCDS Map User

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    [Mar 16, 2009]
    boost leak somewhere more than likely, check for split pipes under the inlet manifold especially
    #7
  9. basscrazy
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    basscrazy Member

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    [Mar 16, 2009]
    ray vag com`d my car and said on sheet it was running mint ...
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  10. 1animal1
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    1animal1 The Clar!! it mouves!!! VCDS Map User

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    [Mar 16, 2009]
    id still not rule it out..... the 1.8T is a weird engine when it comes to lumpy idle
    #9
  11. basscrazy
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    basscrazy Member

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    [Mar 16, 2009]
    could it be my bottom end going or such
    #10
  12. 1animal1
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    1animal1 The Clar!! it mouves!!! VCDS Map User

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    [Mar 16, 2009]
    honestly wouldnt have thought so..... the 1.8T just idle ****..... sometimes worse than others due to various things
    #11
  13. basscrazy
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    basscrazy Member

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    [Mar 16, 2009]
    what else would cause a missfire?

    and why would that explain hearing it allmost a clunk when it coughs
    #12
  14. Mattfaced
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    Mattfaced Member

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    [Dec 30, 2009]
    I HAVE THIS PROBLEM, HELP!! please tell me did you ever find the cure????? old post i know but im desperate
    #13
  15. s4mark
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    s4mark Member

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    [Jan 5, 2010]
    I too am getting this cough when sitting at lights etc (well not right now as car is at work stripped awaiting repair) want to have a good look and clean under the bonnet see what i find. Want to replace all hoses with some forge ones maybe and will give the throttle body and maf a clean at the same time and just hope this cures it
    #14
  16. 1animal1
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    1animal1 The Clar!! it mouves!!! VCDS Map User

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    [Jan 5, 2010]
    i had it for ages, had it checked by JBS for a different fault and they found the pipe that was causing it........ pure luck

    when you think you've searched this engine there will always be another pipe you've missed :)
    #15
  17. ricko
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    ricko Member

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    [Jan 7, 2010]
    i'd try abit of the old redex first might be abit of **** in your injectors. have you had a look at your spark plugs to see if there all the same colour and check the gap's.
    #16

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