BMW M3 318i 323i 325i 328i (1992 – 1998) Ignition System

All engines covered by this article use an advanced engine management system. The engine management system incorporates on-board diagnostics, fuel injection, ignition and other advanced engine control functions.

The engine management system variants include: 4-cylinder M42 (1.8l) BOSCH DME M1.7; 4-cylinder M44 (1.9l) BOSCH DME M5.2 (OBD II); 6-cylinder M50 (2.5l/1992) BOSCH DME M3.1; 6-cylinder M50 (2.5l/1993-1995) BOSCH DME M3.3.1; 6-cylinder M52 (2.8l/1996-1998) SIEMENS MS 41.1 (OBD II); 6-cylinder M52 (2.5l/1998) SIEMENS MS 41.1 (OBD II); 6-cylinder S50US (3.0l) BOSCH DME M3.3.1; 6-cylinder S52US (3.2l) SIEMENS MS 41.1 (OBD II).

All engines use a distributor-less ignition system with individual ignition coils for each cylinder. There is no distributor cap or ignition rotor. Each coil can be selectively controlled by the engine control module on a cylinder-by-cylinder basis. On later systems, knock sensors are used to monitor and control ignition knock (ping) and adjust timing accordingly.

Ignition timing is electronically controlled and not adjustable. The engine control module (ECM) uses engine load, engine speed, coolant temperature, and intake air temperature as the basic inputs for timing control. Knock detection is also an input to the control module, where applicable.

The initial ignition point is determined by the crankshaft position/rpm sensor during cranking. Once the engine is running, timing is continually adjusted based on operating conditions.

BMW M3 318i 323i 325i 328i (1992 – 1998) Ignition System Wiring Diagram

BMW M3 318i 323i 325i 328i Ignition System Wiring Diagram

BMW M3 318i 323i 325i 328i Ignition System Wiring Diagram



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