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What's the difference between idle control valve and auxiliary idle air control valve?

The idle control valve regulates the amount of air that bypasses the throttle plate to maintain a constant engine idle speed. In contrast, the auxiliary idle air control valve regulates the amount of air that bypasses the throttle plate when the engine is cold. The idle control valve is located on the engine and is controlled by the computer. The auxiliary idle air control valve is located on the throttle body and is controlled by a vacuum regulator. When the engine is cold, the auxiliary idle air control valve allows extra air to bypass the throttle plate to keep the engine idling smoothly. As the engine warms up, the auxiliary idle air control valve closes, and the idle control valve takes over.

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