When the key is turned to on the fuse under the hood labled f/inj blows immeadiately. If I unplug the ECM the fue does not blow and there is power across it. I disconnected all the injectors thinking there was a short but it still blows. Could there be a problem with either the crank sensor or cam sensor?
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What seams to be the problem Jessica ? No fuel ? This vehicle has no inertia fuel cut off switch ! I 'm looking at a wiring diagram for this vehicle, there is a fuel pump relay in the under hood fuse / relay box . In the instrument fuse box is a fuse marked F/P-INJ. fuse 15amp.this supply's power to the fuel pump through the fuel pump relay. If you knew how to do it you check for power at the fuel pump relay ! GM Fuel Pump Relay Testing
You ohmed them but did you check them for continuity to GROUND, to find out if one of them is grounded out ! They normally ground to ecm/pcm not to eng. so check them for short to grd with wire harness unplugged from all injectors and check 1 at a time, If they all show open...no ground then check your power should be pink for chafing or bare short to ground. this will be on Bank 2 you are checking which is the Head that setsfarthest back to firewall. Bank 1 is Head farthest to front towards Radiator.
it will not blow when ECM is disconnected, cause there is no power to the injectors when you disconnect the ECM. When you turn ignition on check for fuel pressure at fuel rail. Release pressure at nipple on fuel rail. If no pressure exists puel pump is shot. If there is pressure your fuel filter might be plugged.