jivemiguel
NAXJA Forum User
- Location
- US
Hey y'all first post here, but you guys have been a huge resource for me since I bought my XJ a few years back, so thanks for all of the great resources...
So today I am officially stumped. The other day I fired it up and the engine was rough and threw a CEL out of the blue. I put my scanner to it and there's an open ground on injector 4.
What I don't understand (I'm handy but not a mechanic) is that the wire to the injector has continuity all the way to the pcm, but it's pulling lower voltage. Looks like the other injectors were firing around 3v, and the number 4 was round 0.2v.
Now I had some squirrels in there a couple years ago, and they did in fact eat the wire to the number 4 injector, but I got a new pigtail and soldered it in, shrinktubed it and it has been fine ever since. The first thing I did when I saw it was the number 4 injector, was check my soldering and the pigtail. I even tried soldering in a new one. The issue is not there.
One other thing is the second wires to the injectors (green and orange- I am assuming these are grounds) have all apparently been soldered together in the harness. Or at least it looks like injectors 3-6 are all glommed together and stuck into a large piece of shrink tubing. One assumption I am making here is that since the other injectors are fine, this ground wire is not an issue. So far as I can see the little bit of ground wire that comes out of that mess into the injector appears undamaged.
Here's a pic of that for the curious.
So I don't know where to go from here. Injector wire lights up the test light. There's continuity all the way to the PCM. But the voltage is low.
I also swapped lines and rescanned the car, and it definitely looks like the injector is fine. This is also supported by swapping lines and watching the engine.
Sorry for the long text here. I have been down for a couple days, and I am kinda losing my marbles over here.
So today I am officially stumped. The other day I fired it up and the engine was rough and threw a CEL out of the blue. I put my scanner to it and there's an open ground on injector 4.
What I don't understand (I'm handy but not a mechanic) is that the wire to the injector has continuity all the way to the pcm, but it's pulling lower voltage. Looks like the other injectors were firing around 3v, and the number 4 was round 0.2v.
Now I had some squirrels in there a couple years ago, and they did in fact eat the wire to the number 4 injector, but I got a new pigtail and soldered it in, shrinktubed it and it has been fine ever since. The first thing I did when I saw it was the number 4 injector, was check my soldering and the pigtail. I even tried soldering in a new one. The issue is not there.
One other thing is the second wires to the injectors (green and orange- I am assuming these are grounds) have all apparently been soldered together in the harness. Or at least it looks like injectors 3-6 are all glommed together and stuck into a large piece of shrink tubing. One assumption I am making here is that since the other injectors are fine, this ground wire is not an issue. So far as I can see the little bit of ground wire that comes out of that mess into the injector appears undamaged.
Here's a pic of that for the curious.
So I don't know where to go from here. Injector wire lights up the test light. There's continuity all the way to the PCM. But the voltage is low.
I also swapped lines and rescanned the car, and it definitely looks like the injector is fine. This is also supported by swapping lines and watching the engine.
Sorry for the long text here. I have been down for a couple days, and I am kinda losing my marbles over here.