why is F150 surging when heater is on

Ron Hamacher

Asked by Mar 10, 2016 at 04:26 PM about the 1995 Ford F-150 XLT SB

Question type: Maintenance & Repair

Idles up and down when heater is on.

1 Answer


YOu will have to find a diagram of the idle engine control systems. I've seen some Fords have the engine temp sensor send a signal to the PCM, which in turn, will attempt to either bring the engine up to temp or cool it down via engine speed.

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