Apparently I forgot how to post...
This was just posted on another forum. Maybe it will help.
The issue was with the Bremi coils, which may have not made it into the Z4M series. I have read on this forum, regarding a Z4, with a hesitation and new(er) coil packs being installed by the dealer, although it did not resolve the problem.
Here is the old SIB:
This Service Information bulletin supersedes S.I. B12 08 03 dated November 2003.
designates changes to this revision
Bremi Ignition Coil Replacement
E36/7; M roadster/coupe with S54 from 02/01 up to 06/02
E46, M3 with S54 from 03/01 up to 11/02, and from 01/03 up to 07/03
E46 with M54 from 09/02 up to 11/02, and from 01/03 up to 07/03
E39 with M54 from 09/02 up to 11/02, and from 01/03 up to 07/03
E53, X5 3.0 from 09/02 up to 11/02, and from 01/03 up to 07/03
E85, Z4 from series introduction up to 11/02, and from 01/03 up to 07/03
Engine may run rough and "Check Engine" light is illuminated. Misfire faults are stored in DME control module.
Reduced ignition firing power of BREMI coils due to coil internal insulation deterioration.
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, or in the range from 01/03 up to 24/03 all six coils must be replaced . For replacement instructions
refer to RA 12 13 511 found in BMW TIS.
Only coils manufactured by BREMI are affected. BREMI coils are easily recognizable by the 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 a silver, aluminum housing.
SI B 12 08 03
The last four digits stamped on the top of
BREMI ignition coil housing indicate
the calendar week and year of
As shown on illustration: Week 42 of
Covered under the terms of the BMW New Vehicle Limited Warranty.
Note:The following explanations will spell out the correct use of the work times.
Part Number Description Quantity
12 13 1 712 223 BREMI ignition coil Maximum of 6
Defect Code 12 13 91 12 00
Labor Operation: Labor Allowance:
Main Work 00 54 124 11 FRU – E46, M3 with S54
8 FRU – E36/7, M roadster/coupe with S54
7 FRU – E85, Z4 with M54
9 FRU – E39 with M54
7 FRU – E46 with M54
7 FRU – E53 X5 with M54
+ Associated Work 00 54 692 9 FRU – E46, M3 with S54
6 FRU – E36/7, M roadster/coupe with S54
6 FRU – E85 with M54
6 FRU – E39 with M54
7 FRU – E46 with M54
5 FRU – E53 X5 with M54
Main Work: Use this labor operation number when the only repair performed is the
listed warranty repair.
Use this labor operation number when other repairs or services are
performed along with the listed warranty repair.
Under no circumstances should both labor operation numbers be claimed.
Attempts to claim both times will result in an unnecessary delay in claim
processing and payment.
[ Copyright © 2004 BMW of North America, LLC ]