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Topic Review (Newest First)
08-22-2012 06:23 PM
banks316 ICM is short for Ignition Control Modual its what is used on carb engines. Compared to the ECU (Engine Control Unit) used on fuel injected. The vaccum advance is used to advance your timing through the distributor when at higher RPMs
08-22-2012 04:11 PM
8789yj Is the ICM something that I need to run, or is it connected to send information to the computer? I was under the assumption that due to being a vacuum advance distributor would eliminate the need for the computer to run the engine, but I am far from an expert yet so I could be wrong. Do I need to go buy one or can I get by without?
08-22-2012 11:28 AM
banks316 Red wire im thinking is the eletric choke.
The bottom pic is the oil pressure sending unit.

Two wires comming off your distributor should be going to the ICM
White wire could be voltage regulator or for the volt gauge.
08-22-2012 10:50 AM
8789yj
Engine wires I am not sure where they were supposed to be connected.

I was in the process of beginning of rewiring the basics to get my motor running again. It is an 87 4.2 6 cylinder. This morning I have come across a few wires that I just don't know what to do with or where to run them to. My friend who previously owned this Jeep was going to make a mud toy out of it, and basically cut through anything he figured he didn't need while removing the body, which included about 85% of the wiring. I have poured over my Haynes for a couple hours now, and I can't find anything helpful. I am hoping someone who knows these motors better than I is willing to point me in the right direction.


I have no idea what to do with the red one, which appears to be connected below the carb? It's red so I am thinking maybe it is a power wire? Also the green one which is randomly poking into the engine.

What is the little thingy sticking out of the motor on this side too? It looks like it certainly once had a wire plugged onto it, I just don't know what it does.

Also I forgot to take pics of it but there was two wires twisted together that were orange and purple leading off of my distributor and a white one leading off of my alternator. I found the ground wire for the dist easy enough and the power wires leading to the alternator. The orange, purple, and white ones have me stumped.

If anyone can help with any of them I would really appreciate it. Thanks!

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