N43 Engine - Two Injectors Experiencing a complete loss of electricity

[IrvesBMW]

I need informed guidance on a problem with my engine misfiring (I understand this is not electrical, but I will explain my reason for posting here).

I own a 2010 E92 equipped with an N43 engine.


The misfire persists on cylinder 2 after replacing the spark plugs, coils, and injector 2, as well as coding and clearing the error code. Currently, the diagnostic codes I am receiving indicate misfires on cylinders 2 and 3. I conducted live data testing and found that after around 10 seconds of engine operation, the injectors are losing all electrical charge. I have examined the wire, and there are no visible signs of damage or corrosion; I am uncertain about the further steps to do.




Any assistance would be much welcomed in this matter. I am not a mechanic nor an electrician; nonetheless, I possess sufficient ability and confidence to attempt repairs before consulting a garage.

[IrvesBMW]

[IrvesBMW]

[IrvesBMW]

Any assistance would be much welcomed in this matter. I am not a mechanic nor an electrician; nonetheless, I possess sufficient ability and confidence to attempt repairs before consulting a garage.

[Mistral]

It suggests a potential internal problem with the ECU, however this is only a conjecture based on your description.

[IrvesBMW]

I was apprehensive about it myself. This may be better suitable for an automotive electrician.

[jennycarlotta]

The ECUs are known to float inside their container, obstructing the drain hole. It is advisable to inspect for a tide mark at the bottom of the ECU, since water may have infiltrated. If such is the situation, you may either fix it if you are so motivated or get a new and reprogram it.

[IrvesBMW]

Prior to pursuing the ECU option. Would the ECU deactivate the injectors to avert harm if a gasket failure occurred between cylinders 2 and 3? I am quite unfamiliar with ECU matters and am uncertain if it is advisable to examine that prior to the ECU.

[keithmerc220]

Obtain the pinout for the ECU and examine the power distribution. If they are definitively losing power, that is what I would examine.

[IrvesBMW]

I saw a fissure in the flexible pipe immediately after the catalytic converter. I have applied putty, which has resolved the misfire. I presume that external air infiltrated the system, causing confusion in the O2 sensor. Displacing objects and enriching the injectors, resulting in misfires.

White smoke is presently emanating, but it lacks a nice odor. I hope the head gasket has not failed.


The saga continues for the time being.