How to Replace Idle Air Control Valve 1996-99 GMC K1500

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In this video, we're going to be working with our 1996 GMC Sierra. We're going to show you how to remove and replace your idle air control valve or IAC on a 5.7l V8.

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Here are the items you'll need for this repair.

Lift up on the latches and remove the upper portion of air box. Unplug the intake air tab and mass airflow sensors. Pop the breather line off and undo the thumb screw. Rock the upper part of the intake forward and remove it from the vehicle. Your IAC or idle air control valve is located on the back of the throttle body on the driver's side. This is a little electronically actuated solenoid that changes the amount of airflow allowed to pass the throttle body for when your foot is off the throttle and the blade is closed. To replace this, we'll remove the electrical connector. You can then remove the two T20 Torx bolts with a Torx bit and a ratchet. Once the bottom bolt is loose, you can remove your idle air control valve.

Now that it's out, you can see where that bottom bolt hole is that sits in there kind of like this angle and it's pretty tricky to see that one once it's in the car, so you just got to feel around for it.

Reinstall the idle air control valve and start the T20 Torx bolts. Once the bolts are started, you can tighten them down with your T20 Torx bit and the ratchet. Reconnect your electrical connector.

Reinstall the intake tube by hooking the tab over the front of the throttle body and setting them back into place. Reinstall the thumb screw onto the stud. Reinstall the tube into the filter as well as locking into the back of the air box. Reconnect your mass airflow and intake air temp sensors. Drop the lid back into place. Secure the tabs. Install the breather line and you're good to go.

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