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Home >> BMW >> 1989 >> 325is Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Theory/Operation >> Computerized Engine Controls >> Input Devices >> Engine Speed/Reference Point Sensor
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Engine Speed/Reference Point Sensor

Located on lower right front of engine. It supplies the MCU with crankshaft position information. When the MCU has determined optimum ignition timing (based on input from various sources), information supplied by the reference point pick-up is used to signal ignition firing.