Changed out motor now injectors won't fire??

[kjmacke]

Hello all new to the forum?? My son has a 96 200sx He blew it up so we got another engine and dropped it in. engine won't start getting spark to the plugs getting voltage to one sie of the injector but getting nothing from the pulse side of the injector. So it isn't spraying any fuel. Have checked all the grounds have even gone as far a tring a different ecu nothing seems to work. Please can anybody point me in the right direction. I am by know means am expert when it comes to this stuff. Need help please!!!! Thanks kelly

[RED_DET]

Double check to make sure the injector harness is plugged into the main harness.

[Tr0uble]

Apparently you have an open ground somewhere. Get an FSM and trace from the injector back to the ecu. You probably already know that the ecu opens and closes a ground circuit to make the injectors fire since you even went as far as trying another ecu. Your problem is obviously somewhere between the ECU and Injectors. I'm probably already pointing out something you already know, but hope this helps.

[mcblacktiger]

Tr0ble is probably right....

When I did a motor swap in my 91 sentra I had EXACTLY the same problem. If you check you probably also have signal but no power to the coil. I don't know SX wiring harnesses, but on my sentra there are 2 clusters of 2or 3 ground wires that bolt to the intake at the same spot. I forgot to hook them up and when I did I still had nothing; so I tried some other things and nothing else worked, so I got pissed and tore the wiring harness apart at the same point as the other ground wire cluster,and found that I had tore off one set of the ground wire clusters(which the plastic wiring sheath was hiding) and when I hooked it up, the car fired right up.

If it's any consolation, it took me over two weeks to figure this out. Hope it helps.