How to Clean a Toyota IAC Valve

by Johnathan Cronk
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The idle air control valve in the Toyota is an important component in controlling the Toyota's idle speed. The valve, commonly referred to as the IAC valve, allows the correct amount of air to bypass the throttle plate in order to maintain the proper idle speed. The valve will become dirty over time and cause the Toyota to stall or idle roughly. Cleaning the IAC valve takes a few short steps and can be completed with minimal tools. It's important to keep the valve clean to ensure the efficiency of the Toyota.

Step 1

Place the Toyota in "Park" on level ground and let the vehicle cool for twenty minutes.

Step 2

Locate the IAC valve under the hood of the Toyota. The valve is located on the throttle body and is a 4-inch cylinder unit. If needed, the Toyota owner's manual will have a diagram.

Step 3

Disconnect the valve harness by unhooking it. Remove the two bolts that secure the valve into the valve mount using a socket wrench. The valve will now be loose enough to remove. Gently pull the valve off of the mount.

Step 4

Spray the inside of the IAC valve with throttle body cleaner. Clean any carbon, dirt and debris using a wire brush and rag.

Step 5

Place the IAC valve back onto the mount and replace the two bolts that secure the valve in place. Use the socket wrench to tighten and secure the bolts. Reconnect the harness and close the hood of the Toyota.

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