i have a 2006 m35 sport that cranks and wont start. it first died and started right back up and had a code for the cam sensor. i replaced both cam sensor and crank sensor. it still cranks and wont start after a few miles of driving. i also replaced the ipdm, ecu and still nothing. btw, the cam and crank sensors are all after market parts but it does not throw any codes. spark plugs are also new. any suggestions would help. i dont hear the fuel pump running. it will start up when vehicle is cold. not sure if the maf or intake air temp sensor can cause no start without throwing any dtcs.

If fuel pump isn't priming then that's your biggest issue. You need air and fuel, and you're not getting fuel. Does the car start if you spray starter fluid into the manifold?

I'd check your fuel pump relays, fuses, etc.

MAF would likely cause a rough idle.

The sequence by which you changed the parts is not clear. If ECU (ECM?) was changed then the keys would normally have to be re-programmed. If not you'd have a no-start condition.

The fob maybe

If u took the maf out make sure u didnt put it in backwards

Check the fusible link at the batt+ too