Having researched posts and topics I'd really appreciate some help, giving best description of problem.
1. Engine stumbles, then falls off to idle 8-900RPM, does not respond to throttle even wide open throttle (foot to floor) for 3-4 minutes then responds to throttle input. This happens twice I take Excursion back to house and park it.
2. Called tow truck Excursion taken to dealership - 3 days of trouble shooting no codes and could not duplicate the problem I came and picked the Excursion up.
3. Next morning, 6AM Saturday, wife and I are out stop get breakfast - truck starts we get out of parking lot into traffic - Excursion dies will not restart manage to get to side of road, glad it's early morning no traffic
4. Excursion will not restart - engine spins stumbles then dies refuses to start and run
5. Tow truck comes - Excursion dropped off at dealership - made one last attempt to start Excursion when it was dropped off, would not start, dealership refuses to look at truck until Monday - team system and "my team" are off this Saturday so no other team will touch Excursion.
6. Monday, I'm CA on business trip, I call in and find out Excursion starts runs with no problem and no codes have been written.
Excursion has 120,000 miles on it, EGR was replaced at 80,000, trubo disassembled and cleaned, CAC replaced - in short over $4,000 in replaced seals, and gaskets along with cam position sensor ICP, etc.
Oil and oil filter changed less than 100 miles before this problem, both fuel filters changed in last 5,000 miles.
It's under Ford ESP program thank heaven, I really like Excursion, but am deeply concerned about safety and reliability we do about 2-3 3,000 mile trips a year and the comfort traveling long distances in Excursion is really great any assistance or insight would be appreciated especially to point them in the right direction right now the dealership is throwing their hands up and declaring "We can't fix it if we can't find anything wrong."

 

Tell them to drive it for 50 miles and cut it off......don't come back until it fails. I think they also have some kind of instrument they can install on your vehicle and YOU drive it until it fails....the instrument will remember the conditions.

 

Thanks I will discuss it with them tomorrow of course have heard nothing back from them since Monday when I called them

 

Spoke with dealership today they've had their tech drive truck for 60 miles with recorder box plugged in - truck did not die all fuel pressures and signals diagnostics work - am having. Am really bewildered throughout all of this they say there are no codes at all nothing to go on - any help would be really be appreciated

 

Sounds like they just kept throwing parts at it until the got it figured out. At leeway your know where not to go when its on you're dime.

 

I wanted to close this post out so that others would benefit as this might become a more frequent issue as the 6.0 PSD ages- After 35 days of trouble shooting here's the result HPOP internal o-rings were failing at certain temperature range, it appears that they were within a narrow band of temperature losing tension allowing pressure to bypass and without enough pressure the engine would die or only run in safe mode. If temperature did not drop low enough to cold soak HPOP and engine, it would not die and there is no code to recorded in PCM or FCIM, as there is no code associated with this type of failure. Once dealership figured out how to get it to consistently fail, they forwarded the results over to Ford Engineering, who made the determination to replace HPOP o-rings - bad news 3K for the repair good news thank heaven I have Ford ESP - out of pocket only $100

 

I do not know what HPOP stands for. Please tell me.

 

High Pressure Oil Pump