knock at idle?

Discussion in 'Modifications & DIY how-to' started by crashtke, Sep 24, 2006.

  1. crashtke

    crashtke Member
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    Ok so I finally got the ST software and got everything installed. I did some logs today and for some unknown reason I have an occasional knock at idle...not anywhere else in the RPM's, ran it all the way to redline in 4 gears several times and it never knocks....except the occasional one while idling. Any ideas? This was after a reset and new flash of the ECU, but it seems to correspond to an increase in idle speed and increased AF.
     
  2. nsvwrx

    nsvwrx Active Member

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    i dont think its "real."

    atelast thats what SS told me when he was tuning my car
     
  3. crashtke

    crashtke Member
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    really? lol, so your does the same thing? Odd that the wideband goes a bit lean and RPM's rise a bit when it happens though.
     
  4. moose

    moose Infina Mooooooose!

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    I'm going to throw out a guess here that what you're seeing is your a/c compressor cycling (note that you do not need to have the a/c button pushed for this to occur) causing the bump in rpm's and enough noise/jolt to trip the knock sensor.
     
  5. crashtke

    crashtke Member
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