Question about Jeep Grand Cherokee
Idles too fast.
on a gas engine, the idle speed is 100% controlled by PCM at all times. hot.
so its out of control that means the PCM closes the ISC valve.
and RPM will not drop. (its stuck open) or vacuum air leaks
jeeps use speed density EFI system using the MAP sensor.
this means all air leaks on jeeps , cause wild fast idle speeds.
that is all you need to know , to find problem (find leaks)
clean the ISC yet (idle speed control) valve.?
Posted on Mar 29, 2015
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Posted on Jan 02, 2017
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