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

118,565

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 people found this helpful.

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

118,565

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 people found this helpful.

Your Answer:

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 60,745 nationwide Sierra 1500 listings starting at $1,495.

ZIP:

GMC Sierra 1500 Experts

  • #1
    dragonflyoffshore
    Reputation
    5,610
  • #2
    John Saffrahn
    Reputation
    3,940
  • #3
    Glenn Clingenpeel
    Reputation
    3,740
View All

Related Models For Sale

Used Ford F-150
2,398 Great Deals out of 200,117 listings starting at $1,300
Used Dodge Ram 1500
342 Great Deals out of 9,284 listings starting at $1,800
Used Toyota Tacoma
446 Great Deals out of 50,197 listings starting at $2,695
Used GMC Yukon
333 Great Deals out of 22,560 listings starting at $2,900
Used Chevrolet Tahoe
675 Great Deals out of 38,596 listings starting at $995
Used Chevrolet Camaro
260 Great Deals out of 27,404 listings starting at $2,900
Used Ford Mustang
297 Great Deals out of 40,392 listings starting at $1,312

Used Cars For Sale

2018 GMC Sierra 1500 For Sale
52 Great Deals out of 34,574 listings starting at $20,490
2017 GMC Sierra 1500 For Sale
134 Great Deals out of 5,506 listings starting at $18,250
2016 GMC Sierra 1500 For Sale
60 Great Deals out of 2,797 listings starting at $16,700
2015 GMC Sierra 1500 For Sale
87 Great Deals out of 4,712 listings starting at $11,995
2014 GMC Sierra 1500 For Sale
75 Great Deals out of 2,850 listings starting at $9,900

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.