Mechanics

THE RPMS WONT STAY AT IDLE IN PARK OR DRIVE WITHOUT MY FOOT ON THE GAS WHAT WOULD BE THE PROBLEM

1998 Jeep Grand Cherokee • 230,000 miles

I have replaced the crank postion sensor, throttle postion and control valve


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Ken44
July 4, 2012.



Base idle needs to be set or dirty throttle body.

Roy

Thank you for that info but how would I set the base idle

Tiny
Ken44
Jul 4, 2012.
Idle isn't adjustable on that engine. Was the battery recently disconnected or run dead?

Caradiodoc
Jul 4, 2012.
Yes it was recenttly disconnected to charge the battery and it was dead

Tiny
Ken44
Jul 4, 2012.
The Engine Computer lost its memory and has to relearn "minimum throttle" before it will know when it must be in control of idle speed. It also might not give you the normal "idle flare-up" to 1500 rpm when you start the engine. To meet the conditions for the relearn to take place, drive at highway speed with the engine warmed up, then coast for at least seven seconds without touching the brake or gas pedals.

Caradiodoc
Jul 4, 2012.