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2004 Other Jeep Models High idle after start

Tiny
OZZYDOG1
  • MEMBER
  • 2004 JEEP
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 98,000 MILES
This morning my 2004 jeep grandcherokee started fine, but instantly idled up to about 4000rpms and slow came back down to about a normal 1000rpms ish. It drove fine, after letting sit for a few hours it start up with a real high idle again. Any ideas?
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Wednesday, August 4th, 2010 AT 9:06 AM

3 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
May need to clean out the throttle bore with carb cleaner and a rag, ifit gets too dirty the idle will go all over the place. Also inspect for any vacuum leaks and be sure the coolant level is correct. Has the check engine light come on when itis idling high?
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Wednesday, August 4th, 2010 AT 4:48 PM
Tiny
OZZYDOG1
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No the check engine light didnt come on when this was happning. This morning it started up and ran fine. Ill try and clean it out this weekend. Once in the past the check engine light did come on and it idled hight, but after driving a few miles the light went off.
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Thursday, August 5th, 2010 AT 7:39 AM
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
It may have stored a code in memory. When the light comes on as it is acting up it is a good idea to have it scanned to see what failure the PCM sees
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Thursday, August 5th, 2010 AT 8:25 AM

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