Engine will not start

Electrical problem
1990 Nissan 300ZX 6 cyl Two Wheel Drive Manual 150000 miles

My car trys to start but will not. I first thought it might be the timing belt jumped. After removing the front covers all my timing marks line up. So after reassemble I noticed I have no spark. I changed out the PTU still nothing. I checked the CPS it was good. Come to fine my harness had a short. So I replaced the harness. Now I have spark life is good. SO I thought! The car acts like it wants to start but wont. I checked the code on the ECU and it says CPS. I know this can't be. Could I not be getting enough spark? Could the ECU be bad? Where do I go from here?

I have fuel,
I have spark,
even tried a little starting fluid
still nothing?

Ok I have 150psi on average cyl.
And 40pis on fuel

thanks for looking

Electrical problem
1990 Nissan 300ZX 6 cyl Two Wheel Drive Manual 170000 miles

I installed an after market radio in my Z and everything worked fine. Then I tried to install an amplifier for a subwoofer. The wiring was left from the previous owner who had an amplifier, so I did no re-wiring whatsoever. Unfortunately I didn't disconnect the negative cable from the battery before I connected the power (12v) wire running from the amp to the positive terminal of the battery and there was a small spark when I connected that wire.

Now the car wont start; it won't even turn over (crank). There is full power to everything. The radio works, headlamps, windows, everything. Its similar to when when you turn the key on a car that is standard but you haven't pushed the clutch in. Everything is lighting up on the gague cluster just as it normally would.

Any suggestions?

Thanks.

Thanks for your response. Any idea which fuse it could be? I checked all the ones that were ignition related but they were fine. Could it be a fuse that is not ignition related?
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Computer problem
1990 Nissan 300ZX 6 cyl Two Wheel Drive Automatic 140ooo miles

my zx stopped one night would not start again smoke signal appeared on dash lights I think one of the sensors has tripped the computer could be something to do with the catalytic converter but if the converters blocked it should still start been trying to find a solution for over a year. How do I untrip the computer do I have to have a diagnostic analysis done Thank you

I have a 1990 nissan 300zx. It has around 156000 miles on it. When I put the key in the ignition, all the acc. Lights come on. So I know there is power, but when I try to start the car it blows my battery fuse and in turn wont start or turn over. I have checked the starter and it said it is good. Do you think it could be the alternator or a bad ground.

Easy. Do a voltage drop test on ur starting sys.
Tell me which fuse it blew. We must have work on 100 300ZX last year. No big deal.
Good luck man