[bluebeemer]

So I had a rough cold start and threw a CEL - cylinder 4 misfire on my '09 135i. I swapped #4 coil with #1, and another rough start and cylinder 4 misfire. I FINALLY found my spark plug socket and cylinder 4 plug was wet and black, vs all others gray/tan and dry. Swapped cylinder #4 plug with #1 plug and did a cold start. Still a little rough but no CEL. Pulled #4 plug and it is already black after a two minutes at idle. Bank 2 Short Term Fuel Trims were still running ~ negative 12 or 15, and slowly climbed closer to zero after a minute or two - similar to previous starts.

Am I missing something or is it time to do my first injector change out? Fuel rail pressure bled down to 60 pounds overnight with the car idle. Is this "normal"?

Any advice would be appreciated...