Question about 1999 Pontiac Sunfire

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1999 pontiac sunfire idle

When the car heats up to normal temp the car idles very low and the engine starts to quiver. almost seems like the car is going to stall. Replaced spark plugs. Now check engine light is on. anyone tell me what could be causing this problem.

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It sounds like an airleak on the indution side of the inlet manifold, as the car reaches temperature the aluminium manifold will expand allowing a tiny gap to get bigger.
Try spraying WD40 around the inlet manifold gasket area, if you notice a sudden change in the way the engine is running it is a reasonable indication that some WD40 was just sucked through the leaky gasket and for an instant the car ran on WD40.
The check engine light could be the ECU telling you that you have a lean mixture. (leaking inlet manifold gasket)

Posted on Sep 22, 2008

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