Question about 2004 Pontiac Grand Am

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High idle in a 2004 Grand Am

I have a 2004 grand am. After driving for some time at high way speeds my car's idle speed will want to stay up higher than usual. The other strange part is that this doesn't always happen - it can go several days before happening again. The normal idle speed is about 650 to 700 (with A/C on). However, when the car is acting up it will want to idle between 1000 to 1200 in drive and when in park it can shoot up to 1500 to 2200. The car is well maintained, clean oil (and new oil filter), new spark plugs and wires, new air filter. Since the problem start I have replaced the Idle Air Control Valve and thoroughly cleaned the opening in which it sits. However, the problem persists. On a recent road trip the problem showed itself again with a new twist (this is the only time it has acted this way). After driving high way speed for a while I approached a bridge and when I pressed down on the accelerator more I wasn't getting any more power. However, the car was maintaining its RPM. Then after this happened, when accelerating from a stop the car wanted to rev up really high to take off with out much demand from the accelerator. I am think of checking and replacing the throttle position sensor next. Any ideas?

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  • dechurch May 08, 2009

    Also no engine light is coming on, so no help from the computer in pin pointing the problem.

  • dechurch May 27, 2009

    This seems to have corrected my high idle problem, it has not returned since I replaced this sensor. However, when driving at high way speeds and taking my foot off the accelerator the RPMs dip down to an idle speed of about 700 and then jump back up quickly. Whereas in a normal deceleration from highway speed the RPMs drop steadily as speed drops, rather than that quick spike down and back up. While this is having no impact on how the car runs, I'm not sure if its a hiding symptom of something else.

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  • Pontiac Master
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Yes, the sensor is the first thing you should replace.

Posted on May 08, 2009

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Hi my 2003 grandam gt idle to high

Posted on Jul 26, 2013

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