Question about 2001 Pontiac Grand Am SE

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Engine idles high...in excess of 1200 rpm...replaced the inlet air control valve...did not fix the problem...any other ideas? vacuum line problem?

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  • cheap repair Sep 29, 2010

    did you clean the throttle plate? Use a can of spray carb cleaner and an old tooth brush. Replace the PCV valve or at least clean it. Then use the carb cleaner to spray on vacuum hoses to find a leak. The idle speed will change when the stuff hits it.
    http://www.youtube.com/user/scottykilmer...

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  • 233 Answers

Have you had the idle sensor checked? I had a 92 Grand Am that was doing the same thing. The mechanic checked it (after the wreck) and turns out that was causing the engine to idle high.

Posted on Sep 29, 2010

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1 Answer

WOULD A IDLE CONTROL VALVE/IDLE AIR CONTROL BE CAUSING MY 2000 CADILLAC DEVILLE TO IDLE AT 1400 TO 1750 RPM SOMETIMES IT IDLES OK..IS IT A HARD FIX..THANKS...


Try cleaning the throttle plate first . I wouldn't just change the IAC valve without testing , hooking up a scan tool that show engine data.
A few different thing's could cause high idle .The idea is to test all thing's that could cause a high idle till you find the problem. Vacuum leaks , throttle plate sticking because it's gummed up with carbon , varnish build up . Or is the PCM/ECM making it idle that hight etc... Is the throttle cable bound up.

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Clean out the throttle body carefully and replace the auxilliary air idle valve. There is a resetting process for this valve so dont just fit and hope!
Check on Google or forums but i think ...when fitted you turn on ignition but dont start car , then put the accelerator pedal slowly to fully open, hold it for a min then release. start and drive car until warm and the recheck.
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P1507 means "Idle Air Control Underspeed Error". It can be most commonly caused by a vacuum leak, a damaged Idle Air Control (IAC) assembly or a stuck IAC valve that needs cleaning. Essentially, your engine isn't idling at high enough according to your computer's programming parameters. Many times this shows up in colder weather as you try and start your vehicle. It will usually die unless you put your foot on the gas pedal and raise the RPM's. I have also read where a clogged air filter might be the problem. I would try cleaning your IAC valve first.

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