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

152,235

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 ?

152,235

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.

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