WTS/WIF light flash and stall issue

[Southtexasidi]

I just bought a 2004 F350 6.0 6speed. Truck has 260k on it, but the previous owner seems to have taken good care of the truck. It is pretty much stock with the exeption of a sinister diesel coolant filter, and the blue spring mod. The truck ran great on the way home, but the next day I started having an issue that needs to be addressed.

The problem: I am experiencing an intermittent stumble, stall, or loss of power when I try to accelerate when the truck is cold. When the truck does this stumble, the WTS and WIF light flash. I lose all throttle control and it acts as if you turned the key off. Then it will pick back up and run perfectly. It did it once where the truck completely died and was hard to start back up. The issue seems to go away when the engine reaches operating temp.

I did some reasearch on the issue and found that there is actually a TSB out for 2003-2004 6.0's explaining that some may have harness chaffing issues, which is exactly what the issue seems like to me (shorting harness). I could be wrong. I hooked up auto enginuitiy to it and found it had a code for glow plug #8 circuit. I did a quick visual inspection of the GP harness and did not see anything out of the ordinary, but I wonder if it would be a good idea to change both sides harnesses? I don't want to just throw parts at it but I know wiring issues can be hard to track down.

For troubleshooting purposes the truck has 2 new batteries in it and no other know electrical problems. If anyone has had this issue could you tell me what you found was wrong with it please. I only found a few threads about this issue on Google, so any help is appreciated, thanks

 

[blickcd]

SOLVED. I know this is an old thread but I had the same problem and checked here months ago. Random loss of power as if I had let off the throttle, WIF and wait to start lights would come on for a few seconds. Not long after that I would have normal throttle response.

I was able to solve this but only after the situation deteriorated to a crank no start condition. Only then did I have a code for an open circuit on the camshaft position sensor. Checking that wiring connection, one of the two wires was broken at the plug, with insulation deteriorated or possibly chewed by rodents on the second wire. A replacement plug cost $95 and was spliced into the engine harness in just under an hour. You only need to remove the air filter to reach down to unplug the connector and pull it up to a point where you can make your splice.

Have been driving the truck every day for two weeks and it runs good as new at 219,000 miles. You can visually check the plug and wiring from below. Look up a video on replacing that sensor to see the location. One final note, the crankshaft position sensor is on the other side of the engine behind the AC compressor. Even more difficult to see and probably just as accessible to rodents. If your cam position sensor wiring looks good, check the crank sensor wiring.

The scan tool I used was a Snap-On Modis Edge, which I was able to borrow from my employer's fleet mechanic. Thanks, Perry!