Figure this one out. It's weird!!

[Powerage]

OK about a year ago my wife was on a trip with the truck a couple hundred miles away. She gives me a call one morning says the truck won;t start. Just cranks. So i tell her over the phone how to read the codes with the livewire. Nothing out of the ordinary. Typical tuner set codes. Like a KAM error code. Not sure what the number is but it has been on my truck since the SCT install. Anyway i get her to reprogram the truck to stock. She turns the key and it fires right up. Good i'll check it out when she gets home. She comes home i find nothing obviously wrong. Reprogram it with a custom tune. So i keep driving it thinking it will happen again. It doesn't until just now. Cranks fine but no start. Check codes and there is a p2614 cam sensor circuit open. (i think). Anyway reset codes and crank again. No codes this time. Instead of reprograming it to stock again like the last time i pull the battery wires and let it sit for about 5 mins. Put the cables on and it fires right up. Runs fine again???

Does anyone know what the problem is? Bad PCM? Bad FICM? is what i'm; thinking as it runs and starts fine after a reset. But i don't want it to totally quit on a trip somewhere.

Truck is a late build 2004. It has a livewire running looney tune and a tow tune regularly, straight pipe, and an airaid intake.

[OregonStroker]

so it never runs wierd while driving? only after you shut it off it wont start?

[Powerage]

That's right. Runs fine while driving and for the past year. Just won;t start. It has only happened twice now though. Drove it yesterday after pulling the battery terminals. Ran fine yesterday. Haven't tried starting it today though.

[Powerage]

OK so it did it again this morning. But instead of unplugging the batteries for a minute i wiggled the wiring harness around the ficm and the one going to the pcm. Started up after that!! So where does the harness usually rub through so i can have a look at it?

OH ya and the P2614 code came back.

[Powerage]

Anyone have the part # for the harness i need? Truck is late build 2004 crew cab 4x4 6.0L (obviously). LOL Just incase that's what it turns out to be.

[OregonStroker]

well hopefully someone can help you man. heres a bump.

[Powerage]

So i pulled the intake out and pulled the degas bottle out of the way. I found 3 spots that were starting to wear through. looked at the wires and them look fine. Re covered with loom and electrical tape. The i found a black wire with a ring on the end loose near the rear of the engine. Looks like it is supposed to be on the manifold stud beside the turbo. But i don't really know. The stud is there but the nut that is supposed to hold the wire on is gone. If that's where it is supposed to go. The wire is coming out of the rear most FICM connector. Is that the FICM ground or something else? If it is a ground i will put a new nut on the stud and bolt it down but don;t want to bolt it down if that's not what it is for. Anyone know?

[Powerage]

So i bolted that wire down that i think is a ground. Put everything back together and it has been running fine since the 1st of the month.

Maybe that fixed it?

Does anyone know what that wire I bolted down is for? Is it a ground wire or other? Maybe a tech who takes these trucks apart daily would know?

[m-chan68]

Originally Posted by Powerage

So i bolted that wire down that i think is a ground. Put everything back together and it has been running fine since the 1st of the month.

Maybe that fixed it?

Does anyone know what that wire I bolted down is for? Is it a ground wire or other? Maybe a tech who takes these trucks apart daily would know?

Yes, that IS the main FICM ground. Have you tried wiggling the ENGINE harness by the driver side valve cover to see if the engine reacts or stalls? How about the FICM harness? They usually like to short out on the intake manifolds or studs.

Another thing you can try, is to power wash the engine compartment with the engine running to see if it reacts. For what it's worth, both the FICM harness and the main engine harnesses are very reasonably priced from Ford, believe it or not.

There are two part numbers for the main engine harness depending on the Navistar stamping number on the harness. For a late-build 2004 truck it will either be 4C3Z-12B637-AA or 4C3Z-12B637-CA. The FICM harness is 5C3Z-9D930-A for a 2005 truck, but I'm not too sure if it is the same number for a 2004 truck.

[Powerage]

Thanks M-Chan. Yes i have tried wiggling it and only once it stumbled for a second and then it was fine.

Once i recovered the wiring and bolted that ground wire down i tried wiggling it and nothing happened. It has been running good since i did this also. I just wanted to be sure that the wire i grounded was supposed to be grounded. LOL. I think that was the culprit. Have your ever seen that ground come loose or break causing a no start M-Chan?

Also i may take your advice and replace the harnesses. The I hopefully won;t have any problems.