Question about 2004 Pontiac Grand Prix

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My 2004 Grand Prix GTP starts right away when cold, but once it's warmed up it's hard starting. It will just crank and crank until you give it some gas. What is wrong and how can I fix this problem? Thanks, Dustin

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  • Pontiac Master
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The usual cause for this problem is the IAC valve. It gets carbon buildup on it that becomes sticky when it is hot, such as after reaching normal operating temperature.

Carefully remove the valve from the throttle body, paying close attention to where the rubber o-ring is...it may come out with the valve or it may stay seated to the valve mounting hole. Either way...don't lose it.

On the valve is the pintle that sits in the throttle body air path, allowing or restricting air intake when your foot is off the pedal...if it is stuck, then pushing the pedal is the only other way your engine can get air.
Use a tooth brush and brake cleaner or throttle body cleaner on the IAC valve and inside it's mounting hole. Carbon buildup in this area is completely normal, however, running premium fuel and keeping a clean air filter will help the engine keep the right air to fuel mixture and minimize the problem...and save your starter too.

Posted on Oct 10, 2010

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Posted on Jan 02, 2017

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