My car emitting black smoke/stalling/oil pressure light.

[Spc1953]

Hi there, sat there writing this in a pub where my 325i auto is stuck in a car park. Feeling really pissed off as just put my car through expensive MOT, took it out to celebrate it running and it's totally gone nuts.

Oil pressure light seems to come on at low rpm, and idle. Checked the level, seems fine, but the oil was dripping off the dipstick so seems very thin. Anyway, took it out, ran fine, stopped at a pub, fine.

Got to a junction and the thing seemed to just stall while I was waiting. Started up again fine, then when I was driving seemed a little juddery. Pulled into a car park and it really started juddering, spluttering, and a bit of black smoke started to come out of the exhaust. No smell other than exhaust fumes. I tried to leave by reversing out the space, but it was not happy idling, and the MPG gauge started flapping back and forward like mad, and my car died. Turned the key few times, nothing. Still out there.

Had the car a year and feeling really demoralised. Is this sounding like a big fix? Is this something to do with the oil pressure?

[Brianmoooore]

Sounds like you're dumping LOT of fuel into the cylinders, and enough has got into the oil to thin it enough to affect the oil pressure.
Remove a spark plug and describe the co;our and condition of its tip.
Replace the spark plug and try to start the engine when it's cold. If it starts and runs reasonably well, but then rapidly deteriorates as the engine begins to warm up, the problem is associated with the cold start enrichment system, and the first thing to do is to measure the resistance across the engine temp. sensor pins at the ECU plug with the engine cold, and then hot.