RPM Tachometer fluctuation/bouncing/jumping/pulsating while driving on side roads

Discussion in 'Tech' started by switchbacker, Oct 8, 2017.

  1. switchbacker

    switchbacker Junior Member

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    RPM Fluctuation/bouncing while driving on side roads
    I'm looking to clear the adapts on my 2008 Chevy Cobalt LT 2.2l Auto
    RPM Fluctuation/bouncing while driving on side roads.
    Once your going full blast on the Highway it doesn't happen. Only on the side roads.
    the tach needle goes up and down about a hundred or two rpm's It's more annoying than a real
    mechanical problem. I have read about relearn. I'm not sure how to proceed.
    Thanks for any replies!
    Switchbacker:|
     
  2. David S

    David S Junior Member

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    Relearn is a lie. Had this happen to my 2007 Cobalt, 2.2 LS.

    Best thing for this one is to check the wires on the electrical, that's the problem... nothing mechanical. Clean them, switch them out, check fuses whatever you gotta do.

    This happened to me several time over 12 months. Then it finally started to stall out, because it happened in intersections.
     

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