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Re: Idles high after going from park to gear and back.
Quote:
Originally Posted by ChevyTech
Is the IAC new?
The IAC is a stepper motor and if it does not move for the pulses sent to it the system knows the idle is not right but it does not know if the IAC actually moved. They can get sticky. The IAC gets short pulses of electricity to move.
If any carburetor cleaner gets into the IAC it can damage it.
Another IAC problem that happens is the terminals in the IAC connector can loosen up so they don't have tension for a tight fit.
Looking at the ECM data would be what I would do. You could watch the desired RPM, the IAC count and the actual RPM reading. Another thing to look at would be the Park/ Neutral switch as you shift.
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Thanx for your response. All those answers are in my opening post.
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