The Crankshaft Position Sensor continuously monitors crank angle and rpm to enable the engine computer to fire injectors and spark at the perfect moment. In each BMW automobile model 328i with electronic controls, the compact unit sits by the flywheel or crank pulley and sends out timed electrical pulses, which superseded old manual timing nudges. Many of the early 328i units implemented an inductive Crankshaft Position Sensor that produces its own voltage as a toothed wheel passes by the tip. Later BMW versions accepted hall Crankshaft Position Sensor or magnetoresistive designs that were able to read a stationary magnetic field for faster starts and steadier idle. A less common optical Crankshaft Position Sensor provides ultra precise edge detection, although oil or dust build-up can foul the sensor. When heat, vibration, or corrosion cause breakage in the sensor's connection, the ECU essentially loses rpm data. As a consequence, the engine may idle roughly, misfire, stall, or even refuse to start. Changing the Crankshaft Position Sensor on a BMW 328i restores correct fuel and ignition timing.
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