Question about Pontiac Grand Am
Simple test if you have a vacuum brake booster
put the hand brake on and start the engine
if it idles bad --possible vacuum leak from gaskets , vent controls sensor problems
if it idles fine , put the foot on the brake
if it idles bad now -- replace the brake booster
Posted on May 02, 2017
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Posted on Jan 02, 2017
The PCM controls idle speed to ensure good driveability. The PCM will only attempt to maintain the desired idle speed when it “knows” the throttle is closed. A throttle switch or the TPS input is used to determine when the throttle is in the idle position. Motors and solenoids are used by most PCM’s to control idle speed. Many PCM’s are programmed to attempt to control the idle speed by adjusting spark timing and then by controlling the idle speed actuator. Some computers of the early 80's did not control idle speed.
Posted on Oct 19, 2008
Something similar happened to my van, and it ended up being that I needed to replace a tie rod in one of my wheels. Hope this helps! I know this was posted awhile ago.
Posted on Dec 28, 2008
Not sure what is causing it, but it sounds like you're running on 3 cyllinders. Check plugs, wires, timing . timing belt may have jumped, bad injector, low fuel pressure.
Posted on May 13, 2009
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