Truck has high idle and gets higher when it warms up? Gets up to about 1600rpm

20

Asked by Dec 01, 2013 at 11:38 AM about the 1999 GMC Sierra 1500 SLT Extended Cab SB

Question type: Maintenance & Repair

Replaced rad sensor didnt help!

5 Answers

113,295

Dirty or faulty idle air control valve can cause this issue.

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Best Answer Mark helpful
113,295

A vacuum leak can also cause it. I would check that first.

20

Thanks it's my buddy's truck! Yah we used carb cleaner and sprayed around to check for vaccume leaks got nothing.

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20

Is that valve in the TB?

1 of 1 people found this helpful.
113,295

Yes. Can't seem to get a picture to down load. Sorry. Google this :: 1999 sierra 1500 idle air control valve --- it will give you a picture of one.

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