1992 Chevy Corsica

I'd check for an rpm signal. With the key on, you do have voltage at the injector? The rpm signal comes from the crank sensor, close to or underneath the ignition module.

scan tool shows cranking rpm it shows voltage on both wires to injectors

had autozone check ignition module said it is ok

Use a noid lite on injector plug, should be a pulse, engine cranking.


With all the injectors unplugged, key on, there shouldn't be voltage on the ground circuit, in my opinion. Maybe the ground circuit is shorted to voltage somewhere?