Understanding the BMW Eccentric Shaft Sensor/Actuator BMW’s Valvetronic system is a key component of its efficient and high-performance engines, offering precise control over valve lift for improved fuel efficiency and performance. Central to this system is the eccentric shaft, eccentric shaft position sensors, and actuators. These components work together to fine-tune the engine’s airflow and enhance responsiveness. Role of the Eccentric Shaft, Sensor/Actuators The eccentric shaft in BMW engines adjusts the angle of the intake valves, allowing for variable valve lift. This eliminates the need for a traditional throttle body, reducing fuel consumption. The eccentric shaft position sensor monitors the position of the shaft and sends data to the engine control module (ECM), ensuring accurate adjustments. The actuator, on the other hand, receives commands from the ECM to rotate the eccentric shaft.  In short, it saves you on gas money through increased engine efficienc ... read more