2003 Jeep Cherokee Idle at start up 2003 GrandCherokee Lare

Tiny
EDEPALMO
  • MEMBER
  • 2003 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 88,500 MILES
Sometimes at start up of Engine at least 50% of the time. The Engine Idle speed at start up is 2000 RPM or a little above.
If you turn the ignition off and restart it will be at the normal Idle of around 1500 RPM
I have changed the Idle positioning sensor twice, still have the same problem
Tuesday, February 9th, 2010 AT 10:23 AM

6 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Has the check engine light come on? Have you checked for vacuum leaks?

Let me know.

Joe
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Wednesday, February 10th, 2010 AT 1:03 AM
Tiny
EDEPALMO
  • MEMBER
  • 4 POSTS
Joe No the check engine light is NOT on. I've checked for Vacuum leaks, but found none yet
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Wednesday, February 10th, 2010 AT 7:35 AM
Tiny
EDEPALMO
  • MEMBER
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[quote="Jacobandnickolas"]Has the check engine light come on? Have you checked for vacuum leaks?

Let me know.

Jo
No check engine light isn't coming on. I have checked for vacuum leaks. Have not found any.
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Wednesday, February 10th, 2010 AT 8:06 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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I feel there is a problem with the throttle position sensor, but I can't be sure without a trouble code.
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Thursday, February 11th, 2010 AT 4:02 PM
Tiny
EDEPALMO
  • MEMBER
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Joe; The Service Engine light is not on. Put tester on and can't get any codes at all. In my original post I said I replaced the Idle positioning sensor twice. I meant I replaced the Throttle positioning twice. It still does the same thing.
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Thursday, February 11th, 2010 AT 10:24 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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If there is no check engine light, you replaced the TPS, then my guess is a vacuum leak (I realize you checked) or a temp sensors, or a fuel pressure issue.

Please bear with me. I'm not there and without the check engine light, it becomes a guessing game until the problem is located.
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Thursday, February 11th, 2010 AT 10:32 PM

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