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Posted on Jan 02, 2017
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Dec 21, 2016 | 1994 GMC Sierra
May 28, 2015 | Cars & Trucks
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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Unplug the electrical connector on the IAC valve located on the back of the throttle body near the firewall. No tools are needed to unplug the connector. Squeeze the release tab on the plug and pull to remove it.
Turn the ignition key to the run position but do not start it at this time. Unplug the electrical connector once again, and turn the key off.
Start the engine, and adjust the minimum air rate by turning the adjusting screw located on the throttle cable side of the throttle body until the idle speed is 650 rpm plus/minus 50 rpm. Turn the engine off, and plug the electrical connector back in--pushing until it clicks into place.
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