SoCalManche

I will definitely need to do that since my output for the CPS is minimal.

Sounds good to me.

Hmm....well, it is a 30 year old injector. Is there a way to attempt to ungum it? Does fuel injector cleaner actually work?

Well like you guys said, these ECUs are rather resilient and to find them being the issue as a last resort right? I've seen things here and there about pulling fuel injectors from GM motors, but the different spray rates apply. You well versed in this topic?

https://drive.google.com/open?id=15VdMClg5f8gGDGqYZBlPiWAanOs-FNwU Yeah, I don't really see a lot going on.

Well, I think we may have come to a halt for the time being! The only issue remaining, at least I believe, is the fuel injector. I can try to timing light trick again to see if we can see a spray pattern, but other than that, the other tests seemed to check out. And like I've said, I have really seen a spray out of it at all.

Yeah, should probably drop it off at an auto parts store tomorrow.

Needs one good FIRE to get the alternator charging that battery.

Well, thanks to all the testing, the battery voltage has diminished a bit. Sits at roughly 12.1V. Still FIRES the engine, but the cranking seems a bit rough probably because of the voltage.

Test Light shines bright, also!

New milestone, boys! I had 12V at FP connector, with fuel pump disconnected. Will FIRE without fuel in TBI, but will not stay running. I'm slowly becoming more convinced (X) = Injector.

Yeah, orange wire looks good. All the wires in the cab look pristine, at least where I can see them. I haven't gone up under the dash yet. I can disconnect C_200 and test it, yeah?

https://drive.google.com/open?id=15PUsED9JeYRVHWpinhYtJxcXIS977iGB

Ah, I see now. So the late-model '86 is the true unicorn. Haha!

Hey man, extra caution is good. I always like to double/triple check things to solidify my findings, so I appreciate the tip.

Are you sure pink w/ tracer? It doesn't dip down into the next connector. Maybe orange w/ tracer.

I will do both. When I check voltage, do you mean check at the FP connector?

Screwing it back in is a piece of cake. I bought flexible extensions, and damn do they make life easy. I am down for anything and everything when it comes to the MJ.

Well what would be another solid test inside the cab to track down an electrical gremlin for the FP?

Interior panels have already been torn up from last year when I tried hunting down the issue initially. Well, at least the panels near the driver's side door all the way to where the wires dump under the cab to the FP connector.

Yeah, sorry. I understood after I posted. It seems to be a hair over 5 ohms.

Are you meaning after I connect it back up and go probe it under the dash?

The only prong that hits batt voltage after jumper connects is 100_F4.

So I got three batt voltage readings, but comparing my connector to the diagram, they would be 100_D1, 100_E1, and 100_E4, not 100_D4.

Haha, sorry. I was kind of talking out loud about needing to find three. I haven't found that. I just wanted to know if I needed to check with or without relay in socket. And you gave me the answer accidentally! I'll report back briefly.