Help! 84 vette crossfire injector lead fail

[jlineman]

my 84 crossfire is down an injector, green /white leads are working, red/blue are not I swapped leads an the injector is working,I unwrapped the harness back to the fire wall and seperated wires visual there are no breaks or discolor to any of the wires,I replaced the ECM and PROM the problem still exists.:eyerole

 

[ex-x-fire]

You need to find out what missing at the injector connector, get a good wiring harness diagram. One side has voltage & the other is a ground. Do a continuity check between the inj. connector & the ecm & anything else thats on the diagram. The ground side pulses when cranking.

 

[Schrade]

I don't think the injector wiring is power and ground; I think it's PWM pulse width modulation. This could be why leads on one injector show no current.

OP - why did you replace the ECM?

I think you need to do static fuel pressure test. Do you know how?