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

104,345

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

1 out of 1 people think this is helpful.
Best Answer
104,345

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.
104,345

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 60,427 nationwide Sierra 1500 listings starting at $1,299.

ZIP:

Search GMC Sierra 1500 Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

GMC Sierra 1500 Experts

#1 dragonflyoffshore
dragonflyoffshore
Reputation 4,630
#2 John Saffrahn
John Saffrahn
Reputation 3,240
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 2,900
View All

Related Models For Sale

Used Chevrolet Silverado 1500
2,608 Great Deals out of 152,726 listings starting at $1,500
Used Ford F-150
3,136 Great Deals out of 208,989 listings starting at $1,200
Used Toyota Tundra
660 Great Deals out of 28,450 listings starting at $2,798
Used Dodge Ram 1500
518 Great Deals out of 13,131 listings starting at $1,800
Used Toyota Tacoma
722 Great Deals out of 32,217 listings starting at $2,750
Used GMC Yukon
573 Great Deals out of 17,251 listings starting at $1,875
Used Chevrolet Tahoe
871 Great Deals out of 28,110 listings starting at $1,700
Used Ford F-250 Super Duty
470 Great Deals out of 43,396 listings starting at $2,750
Used Chevrolet Camaro
433 Great Deals out of 40,831 listings starting at $3,500
Used GMC Sierra 2500
193 listings starting at $4,999

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
22 Great Deals out of 32,863 listings starting at $23,800
2016 GMC Sierra 1500 For Sale
74 Great Deals out of 4,722 listings starting at $18,710
2015 GMC Sierra 1500 For Sale
127 Great Deals out of 4,267 listings starting at $15,888
2014 GMC Sierra 1500 For Sale
171 Great Deals out of 4,281 listings starting at $8,988
2013 GMC Sierra 1500 For Sale
120 Great Deals out of 2,470 listings starting at $9,500