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

102,155

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 ?

102,155

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

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 66,259 nationwide Sierra 1500 listings starting at $1,995.

ZIP:

GMC Sierra 1500 Experts

  • #1
    dragonflyoffshore
    Reputation
    5,400
  • #2
    John Saffrahn
    Reputation
    3,740
  • #3
    Glenn Clingenpeel
    Reputation
    3,430
View All

Related Models For Sale

Used Ford F-150
2,581 Great Deals out of 197,076 listings starting at $1,300
Used Dodge Ram 1500
390 Great Deals out of 10,843 listings starting at $1,500
Used Toyota Tacoma
598 Great Deals out of 44,633 listings starting at $1,790
Used GMC Yukon
473 Great Deals out of 22,227 listings starting at $1,995
Used Chevrolet Tahoe
734 Great Deals out of 41,543 listings starting at $1,995
Used Chevrolet Camaro
441 Great Deals out of 30,817 listings starting at $2,495
Used Ford Mustang
610 Great Deals out of 36,332 listings starting at $899

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
94 Great Deals out of 22,347 listings starting at $23,500
2016 GMC Sierra 1500 For Sale
142 Great Deals out of 4,079 listings starting at $16,990
2015 GMC Sierra 1500 For Sale
178 Great Deals out of 5,281 listings starting at $16,900
2014 GMC Sierra 1500 For Sale
172 Great Deals out of 5,018 listings starting at $13,750
2013 GMC Sierra 1500 For Sale
71 Great Deals out of 2,149 listings starting at $7,950

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.