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My truck is idling really high?

Tiny
BRIANNA ALETA
  • MEMBER
  • 2000 CHEVROLET S-10
  • 4 CYL
  • 2WD
  • MANUAL
  • 225,114 MILES
When I crank it up it idles very high. It will go down a little bit when I first crank it up but when I'm driving it and go to stop and mash the clutch it idles very high again. I know I have a vacuum leak somewhere in the HVAC system when I cut the defrost or feet on you can hear the difference. I also have a black vacuum hose coming off the top of the engine that I have no clue where it goes.
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Sunday, April 16th, 2023 AT 5:09 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,913 POSTS
This sounds like you may have a vacuum leak under the throttle body, or the IAC motor needs to be replaced and the passages serviced (cleaned).

Here is a guide that can help:

https://www.2carpros.com/articles/engine-idles-too-high

And use this guide when the engine is cold only:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Here is the location of the IAC motor so you can swap it out. Check out the images (below). Please let us know what happens.
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Monday, April 17th, 2023 AT 12:10 PM

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