Discussion in 'GM Electrical Tech' started by gmcboy717, Oct 7, 2013.

  1. gmcboy717

    gmcboy717 New Member

    just recently im driving and i turn the ac on because its hot and the car acts like it wants to shut off in one incident it did turn off and i turn off the ac and it turned back on with no hesitation i have no clue what can be wrong
  2. csltrains96

    csltrains96 Rockstar 100 Posts

    Is it doing this while you are driving down the road? Or only while idling at a stop? If it is only while idling, it would sound like the throttle isn't getting bumped by the computer to help overcome the torque of the AC clutch being activated.

    Need more info about your ride. Motor size?

    Maybe another member has more advice.
  3. gmcboy717

    gmcboy717 New Member

    Engine size is 4.2 say i start the car and i let it warm up i turn on the heater or a/c the idle start to jump and sometimes it drops and turns off if im driving when i slow down thats when it tends to start surging thanks again
  4. csltrains96

    csltrains96 Rockstar 100 Posts

    I may be wrong, but a surging throttle has to do with the Throttle Position Sensor (aka TPS). Your engine may be stumbling at idle when the heater or AC is turned on because it can't sense exactly where the sensor is at.

    Anyone else have some ideas?

    Good luck.

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