Driving it off the cliff

[piper6909]

Originally Posted by Stl-986

I think you are right. One of the pins is 12v, another is ground from the dme & the other is engine ground (gp12).

This is an area that is not my strongest. I do decent, but not great.

Here is the rub with all this though. the misfires are not constant, that are sporadic. sometimes get a lot of them, sometimes it's 30+ seconds in between misfires

I'm not great here either.

It could very well be a break in the wire with the broken ends close enough together. Somtimes it gets continuity, sometimes it doesn't. Temperature and engine vibrations would contribute to the problem. So would a short between two wires rubbing against each other in the harness. The latter is harder to diagnose because a continuity test would still show continuity. If you're lucky in that case you'd find voltage on a wire that's not supposed to have it, then that would indicate a short somewhere. Besides that, you'd have to cut the harness open and check each wire for a break in the jacket.

I've been following this thread and I empathize with you. Electrical gremlins are a PITA to solve. Hopefully at worst you just have a break in the wire and not a short.

[blue62]

What I found out about VS 42 is that VS=voltage supply.
It is a key on 12volt. So any VS with a number in these wiring diagrams is a key on constant Voltage Supply point.

I would think that any wire that has a break in it but still shows continuity would also show greater resistance on an ohms test.

[piper6909]

Originally Posted by blue62

I would think that any wire that has a break in it but still shows continuity would also show greater resistance on an ohms test.

Correct. Another way to check for breaks is by moving the wire harness while checking continuity.