Why when I stop at traffic light it starts jerk the car, only when AC is on ?

Asked by Guru3BM81 Jul 05, 2020 at 02:50 PM about the 2016 Lincoln MKC Select FWD

Question type: Maintenance & Repair

when I stop at the traffic light it starts to jerk the car only when AC is on

1 Answer
1,845

Peter answered 4 years ago

Some vehicles like my 2000 VW Jetta have a sensor that when the rpm drop, ie: a/c on, headlights on, etc that tell the computer to raise the rpm to compensate for the extra engine power used for the accessories. I would check the throttle position sensor and the idle/air mixture valve. If those check out then have the a/c compressor checked.

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