Injector fuse keeps blowing

Cadillac v8, no engine told but is a v8
and ive never seen any car with 8 injector fuses but we know it has 2. 1 per bank.
the fuse if good. (was)
blows only if 1 coil shorts, a 10 ohm injector uses 10 times less current than a fuse.
and are not ever gang fired, 1 at time sequentially. but ganged is 4amps, so moot.


and shorted coils in the injector do that.
or omg blown up PCM that turned them all on at one time
learn that injectors are PCM modulated to keep them cool
so on time super short. (called duty cycle)
i'd do not agree on sticking theory at all. sure fuel rates wrong./
ok bank 2 fuse blew.
it can only be this bank 2. current overload.

1: fuse was a china clone junk and fail try buying Little fuse/BUSS branded fuses. not junk fuses, or last owner did sure, they did., endless.
2: bad wiring sure, if they short sure the fuse blows or pcm blows up as a result. (PnP injectors,)_
3: bad PCM , injector driver transistors short and BOOM fuse blows.(repeats easy)
4: injector coil shorts if car (secret) 10 ohm coils and is way less , it is a bad injector, 20%error max. IMO
use any DMM meter in lowest range ohms and test each injector coil
all will read the same as a set, (at 1 temperature all)
did I miss any, I think not.

It could be a short in the injector circuit (and it's not that complicated), or it could be a shorted injector itself. You may be able to isolate and find it.
Begin by disconnecting all six injector connectors from the injectors. Now put a new fuse into the injector fuse slot and turn the key to on, not start. If the fuse blows again, there must be a short in the circuit-I'll get to that later. If the fuse stays good, then put one injector connector back on -key still on. Watch for the fuse to blow when you connect each individual injector back on. If you have a shorted injector (internally bad), it can blow the fuse and stop the injector power circuit. That injector must be replaced. The injectors can also be checked with a volt ohm meter, if you have one.

So if your circuit is bad, from fuse to the injector harness connector a pink/black wire supplies constant battery voltage to all injectors-always hot in run or start-each injector gets a splice from this pink/black wire. The other wire at each injector is the dark blue ground wire. From each side of the engine the ground wires splice together-so 3 to each side-and head into the ecm on the 22 pin blue ecm connector. The pin numbers are D3 and D9. When the computer internally grounds one side or the other for a split second, that is where you get the pulse-the injector solenoid is energized, opening the injector for fuel to spray out. So now you know where all the injector circuit is, and where to look for a short. Having a DVOM would help you immensely in troubleshooting any thing automotive. Good luck, let me know what you find.

It could be a short in the wiring-a bare wire touching metal, but sometimes an injector will go bad and short out blowing the fuse. Try unplugging all the injectors, then put new fuse in and turn key on. If fuse blows again, it must be a bad wire in the injector circuit. Each injector has a power wire and a ground wire, the power wire probably derives from the engine computer, and the ground wire definitely goes to the computer.
If the fuse didn't blow right away, try connecting one injector at a time (key on). If connecting one injector causes the fuse to blow-that is a shorted injector. It will have to be replaced.
If connecting all injectors did not blow the fuse, try the wiggle test on the wires, with key on. You may cause the fuse to blow by wiggling or moving a section of wire, and that is the likely source of the short. Separate the wires and examine them closely. Look for exposed wire, melted insulation, things like that. Look for where the wiring harnesses may chaff or rub against something, may be stretched or stressed. If you still can't find it, you may need to run continuity or resistance tests on each individual injector wire. For that you would need a multimeter, a good digital volt ohm meter (DVOM) at a reasonable price is a necessity for automotive work.

Hi K Jones, I'm glad to help!

The only way other then checking the resistance of each Injector would be to unplug one Injector at a time until the fuse doesn't blow then you have found the bad injector. NOTE: Don't rule out a wiring issue grounding out on the engine somewhere because this happens a lot. Hope this helps and have an awesome day K.

So it is the injector fuse, not the pump fuse? The injector circuit must have a short in it, or an injector may have a short and be bad. Have your injectors tested with a "resistance test"-they do not have to be removed for this.If injectors test out good, you need to inspect the injector harness for bad wiring. Maybe you missed some of the melted wires?

IF YOU HAVE CKED FOR A SHORT THEN MOST LIKELY YOU HAVE A BAD INJECTOR. YOU CAN UNPLUG ONE INJECTOR AT A TIME UNTIL IT STOPS BLOWING FUSES OR YOU CAN TAKE IT TO A REPUTABLE TECH WHO CAN HOOK IT UP TO A SCAN TOOL AND IT SHOULD SHOW THE BAD INJECTOR.

why are all the dash lights out and the fuse keeps blowing but it still runs

if the injector fuse is blown then the car won`t start as its not getting fuel into the motor to fire.if the fuse keeps blowing then you could have an injector/s that is drawing too much or the injector driver in the ecm may not be any good and needs replacing or a used ecm.it could be a short some where in the wiring for the injector system that is going to ground.

Might want to chk. for a bear wire on the injector harness that might be grounding out, or might be pintched, if its had engine work done on it in the past. Also chk.wear the injector harness plugs into the maine harness too.

Check for any wiring pinch which might have occurred when the injector was replaced. The injector is driven directly by the computer, so it seems to point at the new computer as being faulty. (pulse signal is always 'on')