Of greatest importance to the idling management of a BMW Z3 vehicle is the idle control valve or IAC which is the one responsible for controlling the airflow that passes around the throttle plate. It is an electrically operated gadget that is connected with the help of the engine control unit so that the engine should not stall at the time of load variation. IAC usually consists of a linear servo motor that by moving a plunger changes the airflow through the throttle body to achieve needed idle speed. Several years different types of the Idle Control Valves might have been fitted to different Z3 models in an attempt to improve endurance and power. But even typical problems like the uneven build up of dirt can cause jamming, and this leads to variations in the idle speed. These issues should be attended to emphasize cleanliness since they affect the IAC in its ability to provide required functionality to the vehicle.
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