Help!! 240sx wont turn over!!

[Jcillest26]

I have a 90 single can 240sx. I rebuild the head, put everything back to place, and its turns on fine. 3 days later, the car doesn't turn on. I check if it has spark, fuel, change ecucleaned injectors, checked sencors, fuses, and anything I might know about cars. But nothing, idk what's wrong. Can anyone help please!

[Josh@NSP]

Does it click when you try to turn it over or does the engine turn over and not crank? I'm assuming it had spark, fuel and the other things you checked?

[Jcillest26]

Yes, it wants to turn over, but nothing. I put starting fluid, and it turn on for a couple of seconds.

[Josh@NSP]

Check your fuel pump fuse, sounds like you aren't getting fuel. If it's not the fuse, it's probably the pump. You can test it by hardwiring it and checking for fuel at the motor, but I do not suggest this to anyone who isn't comfortable with wiring. Exposed wires near a fuel pump aren't safe without proper understanding.

[Jcillest26]

So I've check one of the fuel hose from the fuel rail and gas come out. Maybe not enough pressure?

[Josh@NSP]

It would have to be a pretty low pressure not to allow it to at least run at idle, as it only requires around 32psi, and I have seen cars idle on 10psi and lower. Now I'm thinking injectors. They receive the signal from the distributor as well, so both of these are in question. Injectors click when they are firing properly, they make simple stethoscopes for cars and this works great for injectors. If you listen to the metal injector cap, you can hear a consistent click. If that isn't an option, you have to ohm out the injectors to get a reading. Using an ohm-meter, touch both pins of the injector itself (unplugged from harness) and test for resistance. You should get about 11-14 ohms. Only thing is that I think it's odd for injectors to quit working after just a few days of use, it's generally the other way around. Might wanna give your ecu an old fashioned "sniff" test. If something happened to it, it will smell like fried electronics unmistakably.

[Young explorer]

I had the exact same problem with my 240sx,..I just finish doing a head gasket replace, test drove it and no problem for couple of days and then next time I started the car it turn over for a few minute and die out,..and after that it won't turned over,..it took me months to find out the problem,.I had to replace the ECU twice because it was burnt out,..finally I trace the problem and found a grounded wire located next to the injector between the head and the block,..I had to trace every single wire that is wrap!....it was a black wire that was smash flat exposing just one bear wire,it is hard to see the expose wire you need to really look closely to it,..with a very bright light,..that one single wire was slightly touching between the head and block that causes the ECU to fried...

[Jcillest26]

That's exactly what I would think. Looks like I'm about to check my wire harness to see if that can be.

[davidoliva]

Try to do a leak down test see what you come up with