4 out of 6 clynders are not firing
I am helping my son's friend who has a 95 525-i (m50, I think). It started running very rough. We got the car to start and run with no engine codes showing up.
We started disconnecting the coil wires.
After we removed 1, 2, 3, and # 6. ( all 4 were removed ) there was no difference in how sad the motor ran. It appeared that only cylinders 4, and 5 were actually firing.(Yes it was running with only 2 coil wires conneced)
I got 12 volts at all 6 coil connectors.
The resistance was about .8 to .9 for the cylinders in question.
Number 4 and 5 were about .4 to .5 ohms.
We are planning on swapping number 4 and 5 coils with other cylinders to see if any difference.
Forgive me for I am a BMW nubie...
or if we have caused other problems by our uninformed testing procedures...
Any other possible sensor or an engine ecm issue?
A frustrated father.