ok i previously had a sds em-2 on my sr20det nissan s13 and everything ran perfectly. however the programmer and ecu were stolen.
i recently bought and installed the em-4 i was told everything could be used except the old inj box to run n thats proven true except that my injectors arent spraying. i installed the resistors from the old box n still nothing i cant figure out why im not getting inj. ive checked and i do have spark as well as fuel but no injection plz help!!!^^

You could try contacting shannon at western motorsports and he could diagnose your problem. They have a website just type it in google.

I assume that your getting spark and crank triggers are working. Also that there is fuel pressure.

Make sure that your 12V+ to the injector harnes gives a voltage reading when the ignition key is turned or the engine cranked. Make sure the injector drive harness ground wire is getting a good ground(to ECU).