Revving to high after starting

Asked by Apr 24, 2017 at 08:16 PM about the 1997 GMC Sierra 1500

Question type: Maintenance & Repair

would not start and after a boost it is revving up too high

3 Answers

92,715

Check for vacuum leaks as this can cause high idle speeds and also too lean and that makes it hard to start cold or hot. Now if you have to jump it just to get it to crank over then you could have a bad battery, a draw on the system or a alternator with low or no output.

1 of 1 people found this helpful.

Would it help to take a battery cable off to reboot the computer ?

92,715

If you do that you loose any codes that might be helpful in location any other problems you have, so then you have to start all over again. I forgot to mention the IAC motor assembly, these can get carbon build up and holds the pintle open so you might want to check and clean both it and the throttle body with throttle body cleaner. If it iis really dirty you can use a small brass brush to get it knocked loose.

1 of 1 people found this helpful.

Your Answer

Add photo

Related Questions

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 7,542 nationwide Sierra 1500 listings starting at $3,950.

Postal Code:

Search GMC Sierra 1500 Questions

GMC Sierra 1500 Experts

#1 dragonflyoffshore
dragonflyoffshore
Reputation 5,010
#2 John Saffrahn
John Saffrahn
Reputation 3,540
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 3,150
View All

Related Models For Sale

Used Ford F-150
296 Great Deals out of 8,122 listings starting at $2,499
Used Dodge Ram 1500
52 Great Deals out of 478 listings starting at $2,500
Used Toyota Tacoma
16 Great Deals out of 766 listings starting at $4,950
Used GMC Yukon
12 Great Deals out of 710 listings starting at $9,741
Used Chevrolet Tahoe
531 listings starting at $4,995
Used Chevrolet Camaro
984 listings starting at $13,999

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
5,604 listings starting at $25,170
2016 GMC Sierra 1500 For Sale
13 Great Deals out of 180 listings starting at $23,995
2015 GMC Sierra 1500 For Sale
36 Great Deals out of 460 listings starting at $20,775
2014 GMC Sierra 1500 For Sale
19 Great Deals out of 409 listings starting at $18,888
2013 GMC Sierra 1500 For Sale
24 Great Deals out of 257 listings starting at $15,800

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.