Why is my car revving to 4000 RPMs in neutral?

Tiny
BENUPSHUR
  • 1989 SUZUKI SIDEKICK
  • 175,000 MILES

My car started idling very high a week ago. When it starts and is sitting in neutral, it goes to about 4000 rpms. When I put it in first, it kicks down to around 2500. Every time I shift gears, it revs back up to 4000, when the clutch is depressed, then back to 2500 when in gear. I can basically drive it down the road without using the gas pedal at all! Hard on the clutch and brakes. A friend took the vacuum line off the map sensor and the idle kicked down temporarily. Not sure what that means though. It's back up to 4000 now. It's leaking coolant a bit from the water pump so I'm wondering if that has anything to do with it. The mechanic can't figure it out and said he can't plug a diagnostic tool in.

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Friday, April 27th, 2012 AT 4:41 PM

3 Replies

Tiny
FIXITMR
  • MEMBER

Check IAC valve. And see if throttle butterfly is returning to closed properly.

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Friday, April 27th, 2012 AT 6:28 PM
Tiny
BENUPSHUR
  • MEMBER

Where is it located exactly? On the throttle body? For some reason, I can't find it.

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Friday, April 27th, 2012 AT 6:34 PM
Tiny
FIXITMR
  • MEMBER

89 is built into throttle body.

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Saturday, April 28th, 2012 AT 2:06 AM

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