New genuine renault idle air control valve laguna megane ... (Peter Morgan) The valve is a major management component of the engine which will either decrease or increase the number of revolutions per minute, depending on what the current operating conditions call for. This causes the idling speed of the engine to change as needed. Chrysler calls theirs an Automatic Idle Speed (AIS) motor while Ford refers to theirs as an Idle Speed Control (ISC) solenoid.
This is controlled by the engine's computer.
Common signs of a failing or bad idle air control valve include irregular high idle speed, breaking when idling and the Check Engine Light turns on.
The idle air control (IAC) valve is a crucial engine management component and it will be connected to the throttle body and managed by the ECU (engine control unit). This causes the idling speed of the engine to change as needed. The valve, commonly referred to as the IAC valve, controls the idle speed by allowing air to bypass the throttle plate.
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