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

107,545

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

1 out of 1 people think this is helpful.
Best Answer
107,545

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 out of 1 people think this is helpful.
20

Is that valve in the TB?

1 out of 1 people think this is helpful.
107,545

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

Add photo

Related Questions

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 64,792 nationwide Sierra 1500 listings starting at $1,500.

ZIP:

Search GMC Sierra 1500 Questions

GMC Sierra 1500 Experts

#1 dragonflyoffshore
dragonflyoffshore
Reputation 4,850
#2 John Saffrahn
John Saffrahn
Reputation 3,420
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 3,020
View All

Related Models For Sale

Used Chevrolet Silverado 1500
2,014 Great Deals out of 160,759 listings starting at $1,995
Used Ford F-150
2,429 Great Deals out of 211,450 listings starting at $895
Used Dodge Ram 1500
454 Great Deals out of 11,502 listings starting at $700
Used Toyota Tundra
531 Great Deals out of 32,465 listings starting at $2,995
Used GMC Yukon
400 Great Deals out of 16,382 listings starting at $1,800
Used Toyota Tacoma
550 Great Deals out of 38,152 listings starting at $2,900
Used Chevrolet Tahoe
631 Great Deals out of 27,855 listings starting at $600
Used Ford F-250 Super Duty
398 Great Deals out of 47,835 listings starting at $400
Used Chevrolet Camaro
137 Great Deals out of 35,611 listings starting at $1,995
Used GMC Sierra 2500
4 Great Deals out of 164 listings starting at $2,400

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
33 Great Deals out of 38,994 listings starting at $21,410
2016 GMC Sierra 1500 For Sale
83 Great Deals out of 3,830 listings starting at $18,990
2015 GMC Sierra 1500 For Sale
125 Great Deals out of 4,053 listings starting at $14,999
2014 GMC Sierra 1500 For Sale
133 Great Deals out of 4,462 listings starting at $14,495
2013 GMC Sierra 1500 For Sale
75 Great Deals out of 2,283 listings starting at $8,096