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The RPMs wont stay at idle in park or drive without my foot on the gas what would be the problem

Tiny
KEN44
  • MEMBER
  • 1998 JEEP GRAND CHEROKEE
  • 230,000 MILES
I have replaced the crank postion sensor, throttle postion and control valve
Wednesday, July 4th, 2012 AT 2:27 AM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Base idle needs to be set or dirty throttle body.

Roy
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Wednesday, July 4th, 2012 AT 2:31 AM
Tiny
KEN44
  • MEMBER
  • 2 POSTS
Thank you for that info but how would I set the base idle
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Wednesday, July 4th, 2012 AT 3:24 AM
Tiny
CARADIODOC
  • MECHANIC
  • 33,729 POSTS
Idle isn't adjustable on that engine. Was the battery recently disconnected or run dead?
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Wednesday, July 4th, 2012 AT 6:19 AM
Tiny
KEN44
  • MEMBER
  • 2 POSTS
Yes it was recenttly disconnected to charge the battery and it was dead
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Wednesday, July 4th, 2012 AT 3:24 PM
Tiny
CARADIODOC
  • MECHANIC
  • 33,729 POSTS
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.
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Wednesday, July 4th, 2012 AT 6:11 PM

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