BMW Engine Electrical System
Ignition Timing Change
Complaint/Condition: Surges while acceleration and poor driveability at low speeds.
Remedy: From 12 th May 1984 all model 318i vehicles have had the ignition timing requirements altered from 15 degrees plus/minus 1 degree at 2000 RPM to 26 degrees at 4000 plus/minus 50 RPM.
Ignition Timing Change (Field Fix no. 85 – 1.8-5
Model: 318i produced from October 1983 to December 1984
Complaint:When acceleration revs extend between 2000 and 4000 RPM a surge occurs.
Remedy: This is due to the Bosch ignition distributor P/N 0 237 002 096 falling at the bottom of the tolerance band when the revs extend between 2000 and 4000 RPM.
Complete the following checks: Ensure the ignition timing has been changed to meet the new recommendations (see notes above). Ensure the CO has no faults, if so correct.Fit a field fix revised timing decal onto the drivers side fender well.
* This change does not effect vehicles equipped with ignition distributor P/N 0 237 002 080.
High Performance Platinum Spark Plug
Complaint: Sooty deposits forming on the insulator which can lead to spark plug misfire.
Remedy: High Performance Platinum Spark plugs allow the spark to slide over the insulator preventing sooty deposits forming. By using the high performance platinum spark plug the benefits will include increased service life, consistent operation throughout the service life, improved cold start performance, better idle quality and acceleration, less susceptibility to misfire.
Engine Cranks but does not start
Model: Z3 (E36/7) produced from September 1998
Complaint: Fault code 209 will be set in the DME due to the engine although it will crank it does not start. This is due to a software error in EWS 3D module SW version 05.
Remedy:Remove the faulty EWS module and replace with EWS 3D module SW version 06.
Modified Distributor Cap and Rotor
Model: M3 (E30)
Complaint/Condition: When using the new distributor cap and rotor, which have been introduced into production since December 1988 they must not be mixed. For example the old style distributor is not compatible with the new style rotor. Therefore, if changing the distributor, the rotor must also be changed, or vice versa to remain compatible.
Model: M3 (produced prior to May 1987)
Complaint: Engine Misfires
Remedy: Ensure there are no cracks, wear or damages in the distributor cap. If this gives a positive result then either clean or replace it.
Ensure the secondary ignition cables are working sufficiently to ensure a good fit in the distributor cap.
Wire Connections to Ignition Coil
Complaint: The engine is difficult to start or does not start, displaying erratic cranking.
Remedy: The wire to the positive terminal of the ignition coil has been installed incorrectly. If the metal part of the wire connector makes contact with the metallic coil housing an electrical short circuit will occur. Therefore install the wires correctly.
Ignition Coil Primary Harness Connectors
Model: E31 and E38 with M73 engines
Complaint: The primary harness connectors may not have been fully locked onto the ignition coil housings during production.
Remedy: The primary harness connectors of ignition coils from cylinder banks 1-6 and 7-12, need to be checked and locked into position.
Ignition Coil Replacement
Model: All vehicles with M1.1 and M1.2 DME fuel injection systems.
Complaint: If the DME ignition fails it may cause over heating which in turn will damage the ignition coil.
Remedy: Replace the DME control unit as well as the corresponding ignition coil.
Engine Control Unit
Model: 1982 633CSi/733I, 1983 533i/633CSi/733i, 1984 533i/633CSi/733i
Complaint: If the engine is cold or warm, the vehicle will emit a hesitation or have poor throttle response during the first few minutes of starting. This is due to the internal re-programming of the Motronic Control Unit was not able to compensate for the elimination of the external 560 OHM resistor.
Remedy: Install an external resistor in the NTC line.
E46 330xi and E36 Z3 with M54 3.0 Hesitates, Stumbles at Idle
Model: 330xi with M54B30 produced up to August 2000, Z3 roadster coupe with M54B30 produced up to August 2000.
Complaint: These vehicles will hesitate and stumble when idle, especially when turning the steering wheel. Fault codes are not stored in the DME. This is due to a calibration in the DME/ECM.
Remedy: Reprogram the DME with CD23 after loading the CD23 update.
After reprogramming align the DME-EWS, clear all adaptations and all fault codes in the DME/EGS.
MS43 DME Removal Precautions – EGS Failure Avoidance
Model: All vehicles which have a MS43 control unit.
Complaint: After the ignition has been switched to the off position, the MS43 control module may stay active, this is due to the DM-TL test.
Remedy: Ensure the ignition key is in the off position, and allow 3 minutes to elapse before disconnecting the DME.
If this procedure is not followed irreparable damage to the EGS control module will occur.
M54 EDK Throttle Adaptation Procedure
Model: All vehicles which have a M54 or MS43 control unit.
Complaint: Once a new engine control module or a new EDK unit has been fitted, it is imperative that the electronic throttle control adaptation is reset. If this process is not performed the vehicle will not run, or will run in fail-safe mode.
Remedy: If the vehicle begins to run in fail-safe mode, or does not start at all, then replace the DME or EDK then:
Turn on the ignition for 10 seconds, it is not necessary to crank or start the engine.
Turn the ignition off for 10 seconds. Start the engine.
M5 DME replacement
Model: E39 M5, M5 with S62 engines produced from September 2000 to October 2000.
Complaint: If the engine runs with too rich fuel mixture it may set various oxygen sensor and mixture faults. This will occur due to an incorrect DME being installed.
Remedy: In order to determine if a vehicle is affected it is necessary to utilise the Service Menu of the Dealer Communication System. Based on the results of the system either follow the procedure below or take no further action.
Procedure: Ensure the DME has a green dot sticker. If the green dot is present then replace the DME. If no greet dot is present then no further action is required.