I ask this question a few days ago, the engine idles to fast when cold for about five minutes. Once it goes into close loop it idles fine. If I unplug the idle motor of either of the temp sensors it idles fine. You guys suggested a vacuum leak. I checked for that long ago, brake booster, PCV intake gasket, and any other thing that has vacuum on it. Besides if it was a vacuum leak when I unplug the idle motor and the rpm slows down, it would run rough or shut off. It doesn’t, it run pretty well. Also I can remove the air intake duct and filter, slide a restrictor across the intake for the idle air passageway and the motor slows down and runs at the correct rpm. Like I say once it warms up and the ECM goes into close loop, the motor idles fine around 600 rpms. I think something is setting the idle steeper motor to run at the higher speed 1900, 2000 rpm, I just can’t figure out what. I get no codes set in the ECM.
Thanks for your help anyways.
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Friday, November 13th, 2009 AT 3:08 PM