The Idle Control Valve used in Lincoln Navigator cars is designed to maintain the speed of idle rotation of the engine with the help of the air stream bypassing the throttle plate. This component also integrates with the engine control unit and assists to prop the engine so that it does not stall during load fluctuations. The valve is normally an electrically operated actuator, which uses a linear servo motor for the purpose of controlling the air flow and for sustaining an idling speed. Through the years, Lincoln has incorporated many types of Idle Control Valves in the Navigator, especially employing the idle air control (IAC) actuator. Despite the above provisions that make these actuators rugged and immune to jamming, they still face challenges including the jamming problems resulting from presence of dirt or dust resulting to erratic idling. Cleaning is also part of the Idle Control Valve maintenance and recommended every now and then to prevent everyday use of its components to lead to failure would warrant a replacement.
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