Genuine BOSCH Idle Actuator
Part number 0280140516

The Idle Air Control Valve (IACV) in a car is a crucial component of the engine's control system. It is responsible for controlling and maintaining the engine's idle speed, ensuring smooth and consistent operation. The IACV works by precisely regulating the amount of air that enters the engine when the throttle is closed. This control becomes essential when the car is idling, as the throttle is fully closed during this time, and air is needed to maintain the engine's idle speed.

When the engine is idling, the IACV helps prevent stalling by adjusting the airflow to ensure the engine receives sufficient air and maintains a stable RPM (revolutions per minute). The IACV achieves this by opening or closing a bypass passage in the throttle body, allowing varying amounts of air to enter the engine. The control of the idle speed is achieved by the car's Engine Control Unit (ECU) continuously monitoring various engine parameters like coolant temperature, oxygen levels, and throttle position, and then adjusting the IACV accordingly. This ensures optimal engine performance, smooth idling, and efficient fuel combustion.