Ignition System - Runs Rough/MIL ON/Misfire DTC's Set
SI B12 08 03Engine Electrical
June 2003
Service Engineering
SUBJECT
M roadster/coupe and M3 with S54 Engine; Ignition Coil Replacement
MODEL
B36/7; M roadster/coupe with S54 from 02/2001 up to 06/2002
E46; M3 with S54 from 03/2001 up to 11/2002
SITUATION
Engine may run rough, and "Check Engine" light is illuminated. Misfire faults are stored in DME control module
CAUSE
Reduced ignition firing power of BREMI coils, due to coils internal insulation deterioration
CORRECTION
Follow the appropriate Test Plan from DIS Plus/GT1.
If BREMI ignition coil is found to be defective, and the production date stamped on top of other coils housing's is 42/2002, or earlier all six coils have to be replaced. For replacement instruction refer to RA 12 13 511 found in BMW TIS.
The last four digits stamped on the top of BREMI ignition coil housing, indicate the calendar week and year of production.
As shown on illustration: Week 42 2002
Only coils manufactured by BREMI are affected. BREMI coils are easily recognizable by all black, shiny housings.
Bosch coils, which can also be fitted in M roadster/coupe and M3 vehicles with S54 engines, are not affected and should NOT be replaced as a set. Bosch coils have silver, aluminum housing.
PARTS INFORMATION
WARRANTY INFORMATION
Covered under the terms of the BMW New Vehicle Limited Warranty.