I have a v36 07 g35 that I recently did spark plugs and coil packs for and it ran and drove fine after. It was idling a little weird since the rpms moved up and down a little but I assume that’s because the intakes were all cracked. I let it sit for a while, maybe a week(crazy rain during this time) and when I went to start it again, it had a dead battery. I also noticed a fat puddle of water on my passenger side. Charged the battery and it cracks and start but stalls immediately. Now I read a lot about the sunroof drains and the bcm going out so I fixed the drain, cleaned all the water under the carpet, got a new bcm, and reprogrammed it. Still won’t run. Thought it maybe a vacuum leak, changed the intakes tubes, breather hose, cleaned the mafs sensors and throttle bodies but nothing. I changed my crankshaft too before it started not running since it would have long cranks when starting. I double check to make sure all my coil packs were connected right and checked under the battery tray for water but it was just dirty and I cleaned it. Kinda lost what it could be but if any of you have any information or ideas what it could be, I would appreciate it a lot. Does not throw any codes btw

 

Take apart the IPDM engine bay fuse box and see if it's wet inside.

 

Did that already too, double checked today and it’s dry. I even made sure it was closed properly.

 

This is pretty much what happens every time I try to start it up. Gassing it doesn’t do anything either, it just stays on a bit longer but eventually stalls.

 

Might be a wet ECM as well, take off the kick panel and inspect the primary harness for the ECM, pop the screws on the ECM cover and see if it's wet inside.