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I have swapped the engines out, flashed the ecu with the 330 tune. It cranks but won***8217;t start. I didn***8217;t use any parts from the 325 except for the O2 sensor harness. I don***8217;t have the 325 engine anymore so I***8217;m not able to swap any more components from it. Any suggestions where to start to figure out what the problem is?
 

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SO, you put a 330ci engine (M54B30) in a 325ci car ? is that right?

Did you keep the 325ci DME (Ecu) - which matched the car and then flash it to the 330 tune?

Do you have any codes ? Can your code reader (or INPA, etc) communicate with the DME? Sounds like you have an EWS pblm or possible a DME ground pblm. Who flashed your ECU? Do it yourself?

Figure out if you have fuel, or spark

The increasingly common method is to get it running using the original 325 DME then flash later
 
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