over heading/high idleing

Asked by Jul 28, 2016 at 12:29 PM about the 1989 Mercury Cougar

Question type: Maintenance & Repair

2 questions.why does my car idle at high RPMs
when overheated? And why doesn't my
transmission want to shift into gear while
driving?

1 Answer

69,325

On some vehicles the computer will speed up the idle by advancing the ignition timing when overheating is indicated by the coolant temperature sensor. If the idle only speeds up with the overheating, I'd consider it normal. - Jim

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