750 bank 2 down and why.....
I got a 91 750il where bank two is down with no EML light on. Both fuel pumps runs. Fuel is flowing to both regulators ok. Checked the spark on bank 2 and all wires have ok spark. A fault code is stored saying that there's a problem with the ignition on bank 2. Viewed the fuel injector pulse width and it's at .4 ms and shows the load being at 0 on bank 2. Other side has normal readings. Also the scan tool says the the ignition fault would cut off fuel injector pulse width. Tried swapping coils, dme and maf, nothing's changed.
Found that the spark plug on # 12 was fouled causing the cylinder identification 2(bank 2)signal to be skewed because it runs off of cyl. number 12 spark plug wire for info to the DME. It thought that it had a dead cylinder and the engine management would cut off fuel pulsewidth to that bank.
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