Question about 1995 GMC Sonoma

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Engine occasionally idles at 2000 rpm, if you shut it off and restart idles at 1000rpm which is the normal for this truck. any ideas?

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Dirty Idle Air Control (IAC) valve. it's common for the IAC to seize with carbon build up and will need to be cleaned. You can clean it with throttle body cleaner, just follow the instructions on the can of throttle body cleaner and clean out all the passage ways throughout the throttle body and pay attention to the IAC passage way. You may have to use two cans to clean out all the carbon and note there will be lost of smoke from the tail pipe, but that's just the carbon and residual cleaner burning out and should clear with in 10 min if not less. Do Not Use Carburetor cleaner, the carb clean is too corrosive to the gaskets used on the throttle body system. Good luck and keep me posted.

Posted on Dec 09, 2009

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Posted on Jan 02, 2017

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