infector diagnosis

i pulled a fuel injector the other day can cant tell if its working correctly. if hooked it up manualally to another battery and the injector did nothing. i tried to run some fuel through it and still it didnt even drip from the bottom when i hooked it up to the battery.

did i test it corretly? if not, what would be the best way to test function?

if its a PWM (peak and hold) injector, you probably just destroyed it, if it wasn't already.

Measure the resistance across the terminals. compare it to the other injectors, they should all be close to equal.

That doesn't necessarily mean the injector is good. thats only "testing" the electrical side of the equation. To really know if an injector is working properly, you need to check the spray patern, flow rates and you can't do that with a couple jump wires off a battery

ok didnt answer my question i dont care about the electical equation i know there voltage and amps goin to the injectors the cuirt can be made. i want to klnow how to test the injectors for spray.

hook it up to the car and turn it over.

Without specialty equipment you can't check it for spray. If you put it in the car then remove the spark plug and put like the cap from a can of spray paint over the spark plug hole and turn it over. If after turning it over there is either fuel or the smell of fuel in the cap then it's not clogged but may not be spraying right. Only way to guarantee spray is replace it unless you find an entire circuit schematic for the ecu and wiring harness to see which wires do what and when.

assuming the rail can be pulled away far enough, you can watch the spray pattern directly, but its a bit of a fire hazard and is hard to see the spray patern

I've been told its easier to see if you hook up a timing light and point it at the injector.

the injector problem (i believe) is coming from an 87 ford f150 with the 5.0 liter motor. the truck ran good from tucson to vail (a 42 mile treck). when my friend was headin home, about 1/2 mile from my house it just died comepletely. i replaced the fuel filter since it was completely clogged and tried to fire the motor but the motor wouldnt kick over. fuel makes it to and through the filter and makes it to the fuel rail since i tested for fuel volume and pressure from the pressure testing nipple on the return side of the rail. this is why i believe it is an injector problem. hope this info helps in any way.

there is no computer in the truck, just an inline fuse that was replaced, not by me. since the truck had a problem with the inline fuse before and wouldnt kick over, would the inline fuse be the problem as well? if so where in the truck is it?

huh? If its injected, it definitely has a computer. If it won't turn over (wont crank) then you should be looking at the starter circuit or possibly a siezed motor.

If it is cranking, and you've verified fuel pressure and flow, have you tested for injector pulsing? A test light can verify this. If you have no pulsing, assuming you don't have a shorted injector, your problem is elsewhere.

If you are blowing fuses, something is shorting out.

if its a PWM (peak and hold) injector, you probably just destroyed it, if it wasn't already. Direct battery voltage/amperage to a "dry" injecter multiple times (at least ten just to "make sure") how is it NOT totally F-ed up now? :dunno: