Engine won't start

[julielewis]

I have a 1989 520i 2L BMW and I changed the engine to a 2.5L. No current is reaching the plugs. I also would like to know if the oil temperature sensor could cause it not to start. I am also at a loss as to which connector the crank position sensor and spark sensor should be plugged into.

[whiskychaser]

I have a 1989 520i 2L BMW and I changed the engine to a 2.5L. No current is reaching the plugs. I also would like to know if the oil temperature sensor could cause it not to start. I am also at a loss as to which connector the crank position sensor and spark sensor should be plugged into.

Good swap! I didnt know the 525 had an oil temp sensor - only a coolant sensor-but if yours does I doubt it would could the engine not to start. Perhaps you could post pics of the cps and spark sensor so we can help you decide which is which?

[julielewis]

The crank position sensor was in the wrong location. The engine is so much more powerful. So far I am happy for the swap.

Good swap! I didnt know the 525 had an oil temp sensor - only a coolant sensor-but if yours does I doubt it would could the engine not to start. Perhaps you could post pics of the cps and spark sensor so we can help you decide which is which?

[Dave M]

Good job, thanks for the follow up. After an M50 rebuild, I had the cam position tag/ID thingy on upside down, so starting was, well, not an option. Took some headscratching.

Dave M