[willisodhiambo]

Are you sure engine is N52??? On a F10? Give me VIN please.

N52 indeed, preLCI C549399

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If it is a n 52 engine and the only fault you get is the misfire cyl 5. you should put the valvetronic system in limp mode or fully open the valves and see if still misfires..

How exactly do I do that, pull out motor plug?

Update. It now moved to cylinder 4! This is after we opened up intake to look for anything abnormal, air leaks e.t.c. but jumbled up coils and plugs when putting it back together!!!!!

I think this is a good sign. Asked the owner to thrash it for a day or so so we see if it sticks in cylinder 4 or moves about and whether it moves about in bank 2 or makes excursions into bank 1.

Will update after next encounter. I think it is an ignition problem but not ruling out injection entirely either!. I want to spend an afternoon with it (office work interferes a lot) and follow through the following in quick succession, each followed by a test drive and diagnosis,

1. Swap coils around, drive, diagnose. If changes recorded, replace all coils
2. Swap plugs, drive, diagnose, If changes occur and 1 above was negative, replace plugs
3. Swap injectors, drive, diagnose, If changes occur, replace injectors, if negarive and 1 and 2 also negative...
4. Pull out oxygen sensors, drive and diagnose. If misfire stops, replace these if misfire present proceed
5. Pull out valvetronic motor plug, drive and diagnose (Is that how to put it in limp mode) If misfire still occurs sit down, take a deep breath and drink some beer as we think of the next steps....which leave us with intake, airflow meter and DME