Question about 1999 Ford Expedition
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Jul 04, 2014 | 1998 Ford Explorer
The Idle Air Control (IAC) valve adjusts the engine idle speed. The valve is located on the side of the throttle body. The valve is controlled by a duty cycle signal from the PCM and allows air to bypass the throttle plate in order to maintain the proper idle speed.
Do not attempt to clean the IAC valve. Carburetor tune-up cleaners or any type of solvent cleaners will damage the internal components of the valve.
Fig. Fig. 1: The IAC can be monitored with an appropriate and Data-stream capable scan tool
REMOVAL & INSTALLATION
Fig. Fig. 2: IAC solenoid location-4.6L engine
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