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Old 01-31-2009, 08:19 PM   #2
Squareback
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Join Date: Oct 2007
Location: East Syracuse, NY
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2005 ION-2 Sedan
Default Re: My 2002 Saturn SC1 idles at 2000 RPM while in park. There is also a knocking soun

Your intake is leaking. It's a known defect that was assembled incorrectly at the factory. Spray some Brakleen or carb cleaner (engine running) where the head and intake meet at cylinder #1 (closest to the passenger side, behind the power steering pump if your car is so equipped). You will hear the change in idle when you spray it. Replacing the gasket is an easy DIY project that can be done in a day without a problem. I would also check for other vacuum leaks, 2K RPM is pretty high. Any CEL on?

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