3-Series (E46, E90)Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.
I have owned the car for 4 years and it has been regularly serviced.
Whilst driving on the motorway I suddenly lost power, the engine temperature was normal and I had good oil pressure. RAC recovery man arrived andt ran some tests (fuel pump, injectors all okay). The engine is not firing on cylinders 2 & 3. The RAC man replaced the coil pack unfortunately this did not cure the problem. He advised that it is very likely that the Engine ECU had failed. I purchased a used Engine ECU, EWS, Ignition key and Ignition barrel transponder. All fitted okay, but the engine still refuses to fire on all 4 cylinders.
I have checked all of the fuses, cleaned all the electrical connections, etc.
The engine is has started (briefly) on two cylinders, but is obviously very lumpy.
Is it possible that the replacement coil pack fitted by the RAC man was faulty? Are there any other tests that I can perform before taking the car to a specialist BMW garage?
No, and the coil-pack is its own boss (except for the signal to Fire)
Are you sure the blocked fuel injector wouldn't do that? I have an 06 325i and i had a misfiring cylinder, everywhere i went they said to start by replacing plugs and if that didn't work then try new injectors.
Fortunately for me it was just a bad ignition coil so i didn't have to replace an injector.
Did this problem ever get solved? I have a 99 328i that has the #5 and #6 cylinders not firing. I swapped with a known good coil pack but problem didn't change. I can hear the fuel injectors ticking but I was wondering if they might be clogged. Let me know
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