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The IAC is located in the throttle body and controls idle speed and prevents stalling do to varying engine load. It controls the amount of air that is bypassed around the throttle plate, more air the idle increases, less air the idle decreases. The IAC has a conical shaped tip that it moves in and out to block/open the bypass air passage. The IAC is moved in small increments called "counts" and can be read by most scan tools
A stuck IAC will cause a high idle, low idle, or perhaps correct idle but it won't change if you turn the A/C on (idle increases with A/C).
A stuck IAC will cause a high idle, low idle, or perhaps correct idle but it won't change if you turn the A/C on (idle increases with A/C).
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