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How to Clean the IAC Solenoid:

This is recommended at every Tune-Up to prevent excess carbon buildup on the IAC plunger. In some cases, you'll notice a slightly erratic idle quality. This is the first step in taking care of that problem. IAC = Intake Air Control (Solenoid).

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Remove the Air Hat from the Throttle Body
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Disconnect the sensor harness from the IAC Solenoid (Rear of Throttle Body)
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Remove the two Torx-25 Screws
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Remove the IAC Solenoid (Be careful not to lose the rubber O-Ring)
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Spray some Carb/TB Cleaner in the IAC port on the Throttle Body and let it sit
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Spray some Carb/TB Cleaner on the tip of the IAC Solenoid and wipe clean (Do NOT forcefully twist or push the plunger - You will damage the Solenoid. Wipe very gently.)
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Spray a little bit more Carb/TB Cleaner in the IAC port on the Throttle Body and wipe clean with a thin/lint-free rag
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Reinstall the IAC Solenoid (Make sure you don't lose the rubber gasket on the solenoid)
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Reinstall the sensor connector and airhat
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Start the engine and let idle for about 1 minute.