2003 Pontiac Grand Prix idles funny

  • 32 POSTS

Engine Performance problem
2003 Pontiac Grand Prix 6 cyl Front Wheel Drive Automatic 139000 miles

when I start my car it will usually idle just under 1000rpm, but somewtimes it will go up to a bit past 1000rpm and back down under the 1000rpm mark. Back and forth a few times till it put it in drive. Don't know if this is a problem or not?

Do you
have the same problem?
Wednesday, August 20th, 2008 AT 12:04 PM

1 Reply

  • 77,149 POSTS

Do you have a check engine light and when was the last tune-up?

For a start you can clean the idle air control valve

Disconnect the air intake ductwork from the throttle body.

Start the engine, then increase and hold the idle speed to 1,000 to 1,500 rpm.

Spray the throttle cleaner or engine cleaner into the throat of the throttle body, aiming for the idle air bypass port (usually located on the side or top of the throttle body opening). Give this area a good dose of cleaner (about 10 second's worth).

Turn the engine off to allow the cleaner to soak into the IAC passageway.

Wait about three minutes.

Restart the engine, rev and hold at 1,000 to 1,500 rpm, and repeat the cleaning process again.

Turn the engine off again, and reattach the air intake ductwork to the throttle body.

Start the engine and rev and hold to 1,500 to 2,000 rpm until no white smoke is coming out of the exhaust pipe.

If this fails to make any difference, you can remove the IAC valve from the throttle body and spray cleaner directly on the tip of the valve and/or into the ports in the throttle body. Let the cleaner soak awhile, repeat as needed, then reinstall the IAC valve, start the engine and run it at 1,500 to 2,000 rpm as before until no white smoke is seen in the exahust.

If the idle speed still surges after this, the IAC valve is defective and needs to be replaced.

Was this
Wednesday, August 20th, 2008 AT 12:11 PM

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