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Idles to fast

Tiny
V-STAR07
  • MEMBER
  • 1995 ISUZU RODEO
  • 6 CYL
  • 4WD
  • MANUAL
  • 200,000 MILES
I have a 1995 isuzu rodeo 3.2L V6. When it cool outside it idles above 3000 RPMs at a stop. When you drive it down the road then push in the clutch the idle jumps back and fourth between 900 to 2000 RPMs. When you come to a complete stop the RPMs jump back up above 3000 RPMs. It keeps doing this even when the engine has warmed up.
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Tuesday, December 28th, 2010 AT 11:19 AM

2 Replies

Tiny
ERNEST CLARK
  • MECHANIC
  • 1,730 POSTS
First check for a vacuum leak from one of the hoses and/or intake manifold (gasket). Then check for dirty/sticking throttle. These are the easiest things to check so you do those first. Also, the reason the rpms fall when you engage the clutch: you're putting a load on the engine. It's design to do that.

But you're definitely idling too high. If no vacuum leak, scan computer.
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Tuesday, December 28th, 2010 AT 2:24 PM
Tiny
LEGITIMATE007
  • MECHANIC
  • 5,121 POSTS
I agree, the above mentioned is most likely the problem, you may also want to clean/check/change the Idle air control valve(IAC)
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Tuesday, December 28th, 2010 AT 9:38 PM

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