I have a problem which recently happened on my 1993 525i with M50 engine. The timing suddenly went out of tune. I took it to my mechanic and he said that #5 cylinder is not working and it could be the coil pack. I took the car home figure that it is an easy job. I bought a used coil and installed it. When I started, it is still out of tune. I ended up replacing all of the plugs and still out of tune.
I called my mechanic and he said it could be the injectors now or the ECU. I looked for injectors and ECU and I came up with the following part#s:
Injectors:
1.BOSCH 19 # FUEL INJECTORS PART # 0-280-150-700
2. 19lb Ford/BOSCH fuel injectors for use with the BMW motors
ECU:
1. BMW Part number 0 261 200 405
2. BMW Bosch 413 DME ECU
Which one is which on this items.
BTW, these are from EBay.
Help-Help-Help