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

118,935

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

1 of 1 people found this helpful.
Best Answer Mark helpful
118,935

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.

1 of 1 people found this helpful.
20

Is that valve in the TB?

1 of 1 people found this helpful.
118,935

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.

Your Answer

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 61,781 nationwide Sierra 1500 listings starting at $1,295.

ZIP:

GMC Sierra 1500 Experts

  • #1
    dragonflyoffshore
    Reputation
    5,520
  • #2
    John Saffrahn
    Reputation
    3,820
  • #3
    Glenn Clingenpeel
    Reputation
    3,570
View All

Related Models For Sale

Used Chevrolet Silverado 1500
2,711 Great Deals out of 157,508 listings starting at $1,000
Used Ford F-150
3,001 Great Deals out of 230,370 listings starting at $1,300
Used Toyota Tundra
624 Great Deals out of 35,729 listings starting at $1,500
Used Toyota Tacoma
554 Great Deals out of 40,654 listings starting at $2,600
Used Dodge Ram 1500
319 Great Deals out of 10,795 listings starting at $1,950
Used Ford F-250 Super Duty
434 Great Deals out of 47,653 listings starting at $2,400
Used Chevrolet Tahoe
806 Great Deals out of 40,144 listings starting at $1,900
Used GMC Yukon
496 Great Deals out of 19,415 listings starting at $1,995
Used Chevrolet Camaro
382 Great Deals out of 31,387 listings starting at $3,495
Used Ford Mustang
337 Great Deals out of 41,985 listings starting at $1,488

Used Cars For Sale

2018 GMC Sierra 1500 For Sale
9 Great Deals out of 29,978 listings starting at $22,639
2017 GMC Sierra 1500 For Sale
87 Great Deals out of 5,711 listings starting at $20,999
2016 GMC Sierra 1500 For Sale
118 Great Deals out of 3,473 listings starting at $14,500
2015 GMC Sierra 1500 For Sale
178 Great Deals out of 5,671 listings starting at $13,500
2014 GMC Sierra 1500 For Sale
202 Great Deals out of 4,263 listings starting at $9,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.