1990 Nissan 240SX wont turn over.

Diagnostic says everything is fine and dandy unfortunatly, no help. We think it might be somthing electronic seeing as it was monsooning when it died. As far as the fuel, it seems to be making it to the rail but isn't being injected.

Alright.I'm the owner of the car in question, here's what I've checked:

-spark is sent to the plugs without fail.

-fuel pressure is fine to the rail, but my guess is it's not being injected due to an ecu issue or grouding failure, likely from the rain (it was raining so hard the cabin was leaking a little, which may have shorted something in the wiring around the ecu).

-I have the ecu sitting in two pieces on a table, there is some light rust and corrosion just from age but no major burns. There is slight water damage on the outside of the case but no evidence it penetrated to the board. The ecu does power up but returns a 55-No Malfunction when checked for codes.

-timing chain is intact, as the camshaft spins and the valves open and shut. It is theoretically possible it jumped a cog, but I'm hoping to rule this out as the engine was under no real stress at the time (cruising at 2500rpm, no accel) so I don't see how it would happen.

I was having the same issue with my truck and couldn't figure out what the issue was. Check the sending unit in the gas tank you may have a short in one of the wires. After I replaced mine it was working like new again. Just a thought

Mmm. Checked, fuel is delivered to the rail fine.

Update: I finally got her to start up and idle at about 500 under her own power for about 30 seconds. Tps disconnected, throttle full open (died shortly after releasing it), shaking like crazy as if only one or two cyls were firing. Gotta pull all the plugs again when I get home tonight and retest everything. Any new ideas on this?