Hey guys, I have a 2009 g37x Sedan that I just did an engine swap on because the old engine spun a bearing. The new engine is off of a 2012 M37x, we got the swap done but the engine is cranking but not starting. Engine turns just fine and has good compression, o2 sensors and cats are still off along with the headlights. Is there something we could be missing? Thanks in advance

 

the upstream o2 in the header is in the car though right? that's an important one, but doubt it'll affect starting.

grounds all properly attached?

coil pack plugs in the correct placement? I made the mistake of swapping cylinder 3 and 5 when i did my swap.

confirmed enough voltage in the battery?

 

everything seems to be plugged in right, it has a code for P0603 which seems to have something to do with the ecm,

 

So I had the ECM removed and looked at by a Nissan tech and he said it looked fine to him. I’m kind of at a loss as to why it’s not starting. It sounds like it’s so close to starting but just doesn’t get there. I appreciate anyone who takes the time to try and help

 

has good fuel pressure?

Any chance timing is off?

 

just curious cause I also did engine swap 2014 q50 into my 2011g37 and everything seems good just get no spark and don't know why ,did you ever get it going?

 

2009 g37x, old engine spun a bearing so I swapped a 2012 m37 engine into it, swapped over old fuel rail, new spark plugs, verified fuel pump is fine, but car still won’t start, it cranks but doesn’t fully start, o2 sensors are currently unplugged as cars are off the vehicle, could this be a reason?

 

When an engine cranks, but doesn't start its time to get the scope out:
• verify a correct signal at the crank and cam sensors
• verify the crank/cam signal correlation / phase

Download the EC.pdf at nico club dot com for the reference diagrams.