I believe you have an idle speed control motor, not a valve. This unit has a nose switch incorporated into it that senses when the throttle is closed, so the ecm can start controlling idle. If it senses the throttle in a closed stated when it is not, it will retract fully. It thinks the speed is too high for a closed throttle, and results in a stall when the throttle physically closes. At the throttle cam, where the cable connects, you will see this motor. If you lift the throttle by hand, and press on the isc plunger, you will see it retract. If it stalls and you look and see the plunger retracted, this could most likely be the fault.
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Friday, March 20th, 2009 AT 11:19 PM