The primary job of the Acura TL Idle Control Valve is to keep the engine idling smoothly by letting the engine control unit meter just the right amount of air around the closed throttle plate. It is located on a dedicated bypass passage in the throttle body on many Acura vehicles where a small DC motor operates a lead screw plunger, opening or restricting airflow and quickly adjusting to added electrical loads or gear engagement to prevent motor sputtering. Earlier TL versions were applied in conjunction with throttle bodies attached by cable-driven setups. But the later drive-by-wire editions use the same basic valve coupled with the electronic throttle control, removing linkage problems and also working with stability systems. On second-generation Acura models and later TL variants, this Idle Control Valve is still in the form of a separate service and, unlike the throttle body, the Idle Control Valve often responds to a simple cleaning. Dirt, dust, or air leaks may gum up an Idle Control Valve, causing rough idle or stalling, and although cleaning often reconstitutes function, for a seized servomotor, swapping out the Idle Control Valve is the only way to regain steady idle quality, making every Acura TL calm in traffic.
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