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Home >> BMW >> 1989 >> 635CSi Automatic >> Repair and Diagnosis >> Engine Performance >> Theory and Operation >> Theory/Operation >> Ignition System >> Ignition & Timing Control System

Ignition & Timing Control System

Ignition system is completely controlled by the MCU, according to sensor input from the cylinder identification sensor and the engine speed/reference point (crankshaft position) sensor. MCU acts as ground for ignition coil and triggers primary circuit collapse.