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'03 Jeep Grand Cherokee idling high, intermittent

Tiny
DKBIRD1
  • MEMBER
  • 2003 JEEP GRAND CHEROKEE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 122,000 MILES
Recently, the Jeep was idling LOW, intermittently, so I replaced the IAC at the advice of a mechanic. Now it idles HIGH sometimes (no more low idle). What might be the next logical step?
Sunday, January 16th, 2011 AT 6:44 AM

1 Reply

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Idling speed varies with the volume of air getting past the IAC and throttle plate.

Check for vacuum leaks and ensure the throttle plate had not been tampered with to allow more air past it. Components as leaking hoses, bad PCV etc would allow additional air into system.

Ensure there is sufficient coolant in system.
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Sunday, January 16th, 2011 AT 10:26 AM

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