Question about 2002 Ford Mustang

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Rpm fluctuation only when a/c air conditioning is on, rpm goes up almost 1000. when im driving it almost stalls while i let off throttle when not in gear. why

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There is an idle advance sensor, which increase the idle speed when the A/C is switched on, to stop the car stalling on tick over because of the load the A/C pump puts on the engine. The sensor may be giving wrong information to the ECU.

Posted on Jan 03, 2014

  • Robert anderson
    Robert anderson Jan 04, 2014

    I will let you know how it turns out . thank you for the help

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oldfishead
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SOURCE: When I accelerate it does a fluctuation in

Is the "check engine" light on??? to isolate your problem have you tried MANUALLY shifting the trans (automatic) and still doing it?? check the fluid level and condition of the oil...sound more like the trans is slipping...the "TP" sensor will effect the engine and trans.But not cause over-reving......hope this helps...GL

Posted on Jul 06, 2009

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