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Thread: Bump on idle

  1. #1
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    Bump on idle

    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

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  3. #2
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    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

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    c_dog's Avatar
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    Maybe the throttle boddy needs cleaning\aligning? Sorted out my dodgy idle. There are some threads knocking about on how to do it.

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    if your under the car you can hear it allmost miss its strong enough to hear

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    throttle body has been cleaned re alined etc about 8 months ago? new maf as well

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    c_dog's Avatar
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    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!

  8. #7
    1animal1's Avatar
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    boost leak somewhere more than likely, check for split pipes under the inlet manifold especially
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  9. #8
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    ray vag com`d my car and said on sheet it was running mint ...

  10. #9
    1animal1's Avatar
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    id still not rule it out..... the 1.8T is a weird engine when it comes to lumpy idle
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  11. #10
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    could it be my bottom end going or such

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    1animal1's Avatar
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    honestly wouldnt have thought so..... the 1.8T just idle crap..... sometimes worse than others due to various things
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  13. #12
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    what else would cause a missfire?

    and why would that explain hearing it allmost a clunk when it coughs

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    I HAVE THIS PROBLEM, HELP!! please tell me did you ever find the cure????? old post i know but im desperate

  15. #14
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    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
    2003 S4 Moro Blue Saloon

  16. #15
    1animal1's Avatar
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    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
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    i'd try abit of the old redex first might be abit of crap 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.

 

 

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