IrvesBMW Posted September 15 Share Posted September 15 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. Quote Link to comment Share on other sites More sharing options...
IrvesBMW Posted September 15 Author Share Posted September 15 Quote Link to comment Share on other sites More sharing options...
IrvesBMW Posted September 15 Author Share Posted September 15 Quote Link to comment Share on other sites More sharing options...
IrvesBMW Posted September 15 Author Share Posted September 15 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. Quote Link to comment Share on other sites More sharing options...
Mistral Posted September 15 Share Posted September 15 It suggests a potential internal problem with the ECU, however this is only a conjecture based on your description. Quote Link to comment Share on other sites More sharing options...
IrvesBMW Posted September 15 Author Share Posted September 15 I was apprehensive about it myself. This may be better suitable for an automotive electrician. Quote Link to comment Share on other sites More sharing options...
jennycarlotta Posted September 15 Share Posted September 15 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. Quote Link to comment Share on other sites More sharing options...
IrvesBMW Posted September 15 Author Share Posted September 15 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. Quote Link to comment Share on other sites More sharing options...
keithmerc220 Posted September 15 Share Posted September 15 Obtain the pinout for the ECU and examine the power distribution. If they are definitively losing power, that is what I would examine. Quote Link to comment Share on other sites More sharing options...
IrvesBMW Posted September 15 Author Share Posted September 15 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. Quote Link to comment Share on other sites More sharing options...
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