I know this is been asked so much.
heres my issue, I purchased this 04 G35 disassembled, I have spent the last month working on getting it back together so I could see how it runs.
I have only replaced gaskets on motor, including intake, v/c gaskets upper and lower pan gaskets, rear main seal, plugs.
new clutch ect.
I got driveline back in all wired back up,new plugs,battery, fresh fuel ect. Found couple issues 2 coil packs and cam sensor. Swapped out. Security light goes out when cranking over and when key is turned on.
This car will crank all day, gets fuel,spark and air but not starting. I'm at a loss. Scanner has no codes,and finding no information.
I have a couple short videos but not sure how to upload.

 

Have you confirmed the NATS (anti-theft feature) is working correctly - does the flashing red light on the dash go off?
Post your video on YT. All you have to do is paste the hyperlink in a post, it will embed itself. Gl!

 

the light does work and does go off when key is turned on

 

Never posted there before, but try george Greve on Yt. See if that posted

 

ok, so I have managed to get it to start and run, however I unplugged crank sensor for this to work. My question is the sensor or a flywheel issue?

 

Have you checked for codes or are you running blind

 

Have no codes at all. That's been issue. I read somewhere that someone had unplugged crank sensor and it started.
it was shot in dark for me,and paid off.
That's why I'm asking if sensor or flywheel?

 

I read that if it is the crank sensor, sometimes moving the car or putting it in 5th or 6th while cranking will fire the vehicle.
try that as a troubleshooting technique.
Also, cleaning the sensor and electrical pigtail may help. Was the sensor full of oil? Which sensor did you pull/ driver or passenger?

 

Didn't unplug cam sensors, unplugged crank sensor that is bottom of trans and engine. It was dirty but cleaned it before I installed it.