OK, I've searched this forum and google but haven't found what I'm looking for yet. Lets see if anyone here can find my answer.

I have a 2000 Cherokee Limited, 4.0L. What are the specs for the resistance readings for the fuel injector coils? (min-max)

All of my injectors are reading 14.7 ohms except the #5 injector is reading 13.4 ohms. And it just so happens that cylinder #5 is completly dead (misfire). I'm almost certain that my problem is in the ECU because it won't even drive a noid light and the wiring checks good. But I'm still courious what I should be reading for the injector coil resistance.

Thanks

 

12-15 IIRC for the Bosch we run.

 

I've heard of guys swapping their injectors around to troubleshoot. In my supper limit experience, (did one set years ago), they can be delicate. One was leaking, then soon three where. Anyway I guess good ones can be swapped. New 0 rings and a little Vaseline or something is involved I think. Thought that might help.

 

If the noid light is not firing, chances are pretty good that the #5 injector driver in the ECU is at fault as long a you're sure the wiring is good.

 

Thanks for the replies folks. I checked it out with an oscilloscope last night and #5 injector drive circuit is simply not working. It's a solid 12 volts and not firing low to drive the injector. I did move the #6 injector connector to the #5 injector and the #5 fuel injector did work. Looks like I'll be ordering a new ECU from autocomputerexchange today.