Dead injector wire?

[eboy0]

So i was driving my car normally when all of a sudden i shifted and it kinda bogged... when i gave it some gas it bogged even more...
Pulled over and it threw a injector malfunction 4, it idles but idles on 3 cylinders... which makes it sound like a tractor..

Anywho, i limped home..

Here's what I did so far;
1. when i pull the plug on #4, the condition doesn't worsen, when I pull the plug on any other injector the condition worsens.
2. checked resistance on each of the plugs; (4 = 0 ohm) (3 = 444 ohm) (2 = 520 ohm) (1 = 500 ohm) don't know which setting i had it at, but i'm guessing its only a decimal thing.
3. With car running, took a different injector I took off the car a while ago, which was working, and plugged it into plug 4, i didnt hear any clicking, plugged it into plug 3 it clicked
4. Swapped in a different ECU... same thing, just idled a big higher because didnt have my deadtimes set or anything.

So, it seems i ruled out many things.... so where exactly do I go from here, tried to follow where the injector wires go, but they just kinda run into one fat loom... where do I go from here guys??

 

[luv2rallye]

Sounds like your injector #4 resistor is bad or it's wire is shorted to ground. What resistance do you have measuring from injector #4 harness plug's solid green wire to ground (injector unpluged)? If 0 there's a short. Unplug the injector resistor pack (the metal can bolted to the firewall in the middle with 5 wires coming out of it) and measure again. If still 0 the wire between the two is shorted. If now infinite, the short is in the injector resistor pack. Each resistor in the pack should be 5.5-6.5 ohms (solid red to each). Also test #4 injector itself to make sure it also isn't damaged (2-3 ohms).

 

[eboy0]

Sounds like your injector #4 resistor is bad or it's wire is shorted to ground. What resistance do you have measuring from injector #4 harness plug's solid green wire to ground (injector unpluged)? If 0 there's a short. Unplug the injector resistor pack (the metal can bolted to the firewall in the middle with 5 wires coming out of it) and measure again. If still 0 the wire between the two is shorted. If now infinite, the short is in the injector resistor pack. Each resistor in the pack should be 5.5-6.5 ohms (solid red to each). Also test #4 injector itself to make sure it also isn't damaged (2-3 ohms).

Great info, i'll give this a try in the morning, since the stupid resistor box is kinda hard to get your hands on, and I've sworn enough today... i'll let you know tomorrow
Thank!

 

[Mikael SS]

unplug the suspect injector and wire it to another injector. if the problem goes away, you know the injector is ok.

i know on high impedance injectors they can be tied together, not sure about low imp.

And to anyone else who wants to come in here and say "it'll misfire since the injector timing is off" save your fingers, and read up on batch fire injection.

 

[eboy0]

This can be marked as resolved, it was the resistor pack that went bad... never knew they can go bad out of the blue, but I guess they can.... thanks for the help guys.