So you check fuel pressure without a gauge and read codes without a code scanner. Got it.

 

I think I might have found the issue. its the connection between the computer and wiring harness. how I came to that conclusion is a about a month back the jeep cut out just as I was leaving work and would not restart. with limited tools, I determined there was no spark. I kept trying to start it but no luck. eventually I pushed on all the electrical connections to make sure they were tight and then it restarted. while it was running I pushed/wiggled on the connector going into the computer (the far right one towards the drivers side) and the engine momentarily cut out. i drove it like that until the weekend when i had a chance to go to the JY to pick up a wire harness thinking that there might be an intermittent wire in the harness near the connector and was thinking I would change it out to see if it takes care of the problem. but before I was able to install the new-used harness I thought I would try using an electric connectivity grease just in case that over the years the connectors had worn down and not conveying the 5v needed to run (easy to try in comparison to changing out the harness). so I found this stuff (no-ox): http://www.sanchem.com/electrical-co...lubricant.html


using a pin, I applied just a touch on each female connector and thoroughly cleaned the face so that there would not be any shorting. since I was in there I removed the harness grounding wire connection (located near the coil) and cleaned those up and added some connectivity grease there as well.


since adding the grease I have been driving the jeep for the last few weeks with no issues so I think that was the problem. I did not use any on the crank/cam sensor but once the weather gets a little better i plan on using it there as well. Hopefully this helps someone else and is certainly worth a try since its so easy to do.

 

The best way to clean up those connectors is with a plastic-safe electrical spray cleaner, then use a tiny flat pick to slightly collapse the female connectors so they hold tighter on the male pins. Carefully, so you don't cause a misalignment that can bend a pin, that is. Too much dielectric grease can cause a no-contact problem.

EDIT: I just checked your link and I see you're using a conductive grease. Good deal.

One other problem that is common with PCM connectors is the weight of the cables can cause the solder connections inside the PCM it crack. Those can be resoldered with some care as well.

 

Thank you Dave - dielectric grease was my first thought then I looked into it and discovered its an insulator, not a conductor. I did not state it in my last post but yes, I used electrical spray cleaner. electrical cleaner does not leave anything behind and does not melt plastic.


for comparison here is a link describing dielectric grease in case anyone is interested:
http://www.wisegeek.org/what-is-dielectric-grease.htm