What could it be????

[Drummerboi]

Just did a engine swap...or replacement...hehe...(M50 for another M50...since i screwed up mines)...anyways..the problem is that the car won't start up..... installed everything and when trying to start up the car...the car wouldn't start....the car is cranking but it won't start....could it be mis-wiring....check everything and they all seem to be fine...you guys have any idea???

[Haelo]

To diagnose something like this you have to narrow it down. See if there is fuel getting to the engine, then see if there is spark, and just start narrowing it down logically until you find the problem.

[Drummerboi]

does bmw require to reset after swapping???