1991 Isuzu Pickup - Injectors Won't Pulsate

Most fuel injection systems supply the 12 volts to the injectors as long as the key is on and then switch the injectors ground side on and off. Your ECM may not be working or has lost power, ground or its timing reference sensor signal that it uses to know when to fire each injector.

Hello timlisaallie,

Only a though

I would check your camshaft position sensor, if it is ok...

Remove sensor and rotate engine. See if cam is rotating. If not the timing chain or belt broke or camshaft is broke in half.

Elect. Schematic diagram shows pulse comes from ECM with respect to engine timing and orientational position.

Regards.Tim