Question about 2002 Pontiac Grand Am
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Posted on Jan 02, 2017
The idle speed is not adjustable, it is computer (PCM) controlled, you can turn the screw for the hard stop, but the computer will just over ride that adjustment for the most part, what I think you may need to do is clean the throttle valve and the idle speed control air bypass valve, use carb spray, spray it in the intake with the engine running use the at least 1/2 the can, the engine will try to stall, keep it running, after you are done disconnect the battery for 10 minutes, reconnect and drive a few days so the computer (PCM) can relearn your driving habits and set the idle correctly based on your driving.
Posted on Oct 16, 2008
Make sure your throttle cable is not bound up on anything. Also where the throttle cable ends at the throttle body make sure it moves freely and there is nothing obstructing its movement..Rpms are a little too high to be a vacuum leak.
Posted on Jun 24, 2009
SOURCE: 1995 Grand Prix idling high
A verry large Vacumn leak .. check for a hose off somewhere..particularily the PCV hose..also were the O rings present or missaligned on the Injectors?? also the gaskets between the lower and upper Intake manifolds could cause this if they were not installed in the proper position.. If you have a scan tool Check Idle air controll motor...Under data stream IAC will read 0 counts this will confirm a vacumn leak
Posted on Nov 06, 2009
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