Key Additional Information: The vehicle's idle speed control valve is designed to allow the electronic control unit to regulate air flow to the engine independently of the driver's throttle input.
When the engine is idling, the ECU uses both the idle speed control valve and ignition timing adjustments to compensate for the various loads the engine must overcome to maintain the desired idle speed.
If the idle speed control valve malfunctions, the vehicle may experience an unstable idle or even fail to start properly.