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Variable revs when idle !?!?!

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by Mikebabs1, May 26, 2009.

  1. Mikebabs1
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    Mikebabs1 Member

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    Hi all,

    Hoping you helpful chaps can ... err ... help! :)

    Recently my 2001 A4 2.0 petrol has been experiencing varying revs when idle. The rev counter sways between 9k - 12k RPM when stationary with my left foot on the clutch, or in neutral, and my right foot nowhere near the throttle. The difference is audible, as if I was pushing/releasing the throttle.

    There's also a noticeable lag when pulling away, but no engine management light or any other symptoms. Not sure if it's related but I had a coilpack go a couple of months back, which I replaced myself.

    Any ideas what the cause could be? It's on 105,000 miles and recently serviced at an independent (who couldn't find a problem).

    Cheers.

    Mike
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  2. blackpool1974
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    blackpool1974 Member

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    The rev counter sways between 9k - 12k RPM when stationary


    I hope you mean 900 and 1200 or else your engine is going to blow up pretty soon
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  3. Mikebabs1
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    Mikebabs1 Member

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    Ha! Yes indeed, sorry, you're right. :)
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  4. J7USS
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    J7USS Shuddup Foooool!!

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    :haha: @ Blackpool!!
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  5. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator

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    Throttle body could prob do with a good clean and an Adaption
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