I have a 03 g35 so my problem with it is when I try to turn it over it just goes clank and nothing else. Also, the fuel pump is loud when its in ignition mode.

 

Do you have any codes?

 

There is no code. It's like the engine is locked but when I opened it up everything was still in its place nothing was loose or out of place. Pistons were still there no holes in the block so now I'm just stuck. Could it be the engine is vapor locked and the pressure would cause the engine to not turn over?

 

What about turning it manually from the crank pulley? If you can't spin the engine by hand then SOMETHING is locked up.

Pull the spark plugs, that way there's zero chance of a hydrolocked cylinder that's preventing you from turning it.

If it still won't turn then pull the access cover opposite side of the block from the starter and see if there's carnage in the bellhousing preventing the flexplate from turning.

If everything checks out then it's probably a spun crank bearing, drain the oil and look for glitter.

 

Engine is def locked up since I can’t even manually spin the crank even if I have the spark plug out. But hopefully it’s not a spun crank hub since this engine is fairly new.