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1999 GMC Jimmy 4X4

Tiny
CAROLYNS1
  • MEMBER
  • 1999 GMC JIMMY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 171,000 MILES
Vehicle idles up when vehicle gets warm. Have to put vehicle in neutral to stop vehicle on snow and the idle goes to 1500 rpms. After sitting for a little while the idles drops. Idle doesn't go down when you take foot off the pedal.
Monday, December 6th, 2010 AT 2:59 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Has the check engine light come on? Have you checked your idle air control motor? Have you checked for vacuum leaks?
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Monday, December 6th, 2010 AT 3:01 PM
Tiny
CAROLYNS1
  • MEMBER
  • 2 POSTS
I have checked for vacuum leaks and replaced iac motor. The idle goes down eventually if you sit there for a while. But right now I plowed a fence down because the idle would not go down when I applied the brakes. The check engine light has been on for about 2 years and it has been the same code the whole time.
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Monday, December 6th, 2010 AT 3:41 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
What code are you getting from the check engine light? Also, have you checked the throttle position sensor (TPS)?
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Tuesday, December 7th, 2010 AT 1:06 PM

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