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Electrial Issue Sanity Check....
I've had a long term problem with my 2001 F-350 7.3 Powerstroke. When running highway speeds truck would die and dash lights would all cycle, like starting, take foot off accelerator and press back down and go on.
If idle, likely truck would die. Only code ever set was CPS sensor. It's been replaced a few times.
I cleaned the connector at the EEC and no difference. Tonight I changed the CPS again and this time cleaned some of the wiring harness grounds to frame.
Something new I found was at the big square connector on the drivers side valve cover. I took it loose and 3 of the wires had melted insulation where they had been in contact with the valve cover. I used a high temp tape and covered the damage. I also swiped about 3 inches of jacket from the end of the battery cable and put that around these wires to try and isolate them from the heat of the valve cover.
Seems to run OK now but will need a road trip to confirm.
What I would also like to know is how were these supposed to come from the factory? There was a 3 inches of uncovered wires between the plug and the PVC jacket and no standoff to keep these off the valve cover. I would really like to have a wire standoff there but don't know what to use. Thanks....