Engine sometimes races to 3000 RPM a few minutes after starting.

1993 PONTIAC BONNEVILLE
120,000 MILES
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DAVE KENNEY
  • MEMBER
  • 1 POST
Pulling over and stopping and restarting the car immediately fixes the problem. It does not happen all the time and only when the engine is cold. It never happens when the car is at the repair shop.
Nov 19, 2011 at 3:26 PM
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DRCRANKNWRENCH
  • ✓ASE Certified Mechanic
  • 3,380 POSTS
  • ASE Certified Mechanic
It soundslike Idle Air Control Valve or a vacuum leak.
i am giving you a diagnostic walk through that will help you go through the car and find and fix common over rev issues.
It tells you how the IDLE AIR CONTROL works as well and how to check it.
You can find the IACV on the intake manifold near the throttle body.
Nov 19, 2011 at 3:59 PM
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DRCRANKNWRENCH
  • ✓ASE Certified Mechanic
  • 3,380 POSTS
  • ASE Certified Mechanic
I forgot to give you the link.

https://www.2carpros.com/articles/engine-idles-too-high
Nov 19, 2011 at 4:00 PM
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