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2000 GMC Jimmy 2000 Jimmy - High Idle while driving

Tiny
RONF
  • MEMBER
  • 2000 GMC JIMMY
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 100,000 MILES
Hi, 2000 4.3 l jimmy, lately when driving in winter, the rpms hang around 1500 rpm, and while trying to slow down they stay up there pushing the jimmy forward. If I also shift into neutral while driving, they stay up at 1500 and while coasting if I press the gas, they goupto say 2300 and stay there, untill I actually come to a stop, at that moment they drop back down to 700. When I pull it into drive they jump back up. After it warms up all goes normal. Also noticed that the other nite at -20 C out it stayed that way two hrs. Seems to be somehow temp related and also if you are in gear and moving?
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Monday, January 28th, 2008 AT 3:31 PM

2 Replies

Tiny
LEIF-MINDY
  • MEMBER
  • 1 POST
I have the same problem with my 1998 Jimmy. HAve you found a fix yet?
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Monday, February 18th, 2008 AT 5:02 PM
Tiny
TRUCKCHEVY4
  • MEMBER
  • 23 POSTS
I would check the not sure of technical name of it but its a cold start sensor causes motor to high rev when cold to help warm it up.
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Wednesday, February 20th, 2008 AT 9:52 PM

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