So my 2003 f250 6.0 powerstroke has started to randomly die, usually around 190 degrees or so. Does not throw any codes. Will restart after about 10-15 min cool down, but will only make it about 1-2 miles before it dies again. I just replaced the ICP and pigtail, gained some throttle response that i havent had since purchasing the truck back in december. Nothing aftermarket has been done. Scangauge 2 hooked up.
ICV:.25v
FICM main power 54.5v
FICM logic power 12v

Any ideas?

 

Data needs to be accompanied with the conditions in which it was taken.

Is your data above simply at KOEO, is it cranking data, is it data at idle?

 

Data is taken with KOEO

 

That indicates a good ICP sensor and that the FICM Power board (assuming it is a modified 54 V FICM) is ok initially.

Now we need data when cranking (when you get the no-start).

To start with, we need:
ICP pressure
ICP volts
IPR % duty cycle
FICM MPower
FICM LPower
FICM sync
Cranking rpms

Probably the most common issue on the 03's and 04's when you have a hot no-start is the ICP and next is the HPOP. You seem to have resolved any potential ICP (or ICP wiring) issues, so the next most likely issue is the HPOP. That said, it is expensive and you don't want to just jump at replacing it! You might also want to start reading up on doing an air test on the high pressure oil system.

 

OP -- highly likely it's the pump, distribution system

I'd also do a relocation on the ICP when in there ............................most tractor / AG supply vendors have all the parts you need......approx $35 or so and will save future headaches on accessing the ICP........try keeping the length to around 16" or less and go with the newer model ICP too

 

While cranking
ICV .47
Icp pressure: 273
Ipr duty cycle 84.7. (I think we found the problem)
Ficm main power: 54.5
Ficm logic: 11v
Ficm sync: 1
Cranking rpm: 272

If i wired up the signal and reference volt wires on the pig tail backwards, could that be an issue? I know i have the pressure wire correct.

 

The engine should start w/ the ICP unplugged, so that is the best way to distinguish between an ICP sensor (or wiring) issue and a real issue w/ low HPO pressure. IMO, with your readings, it looks like you have the wiring correct.

You will probably need to air test, but the likely scenario is a new HPOP. That said, you could have a leak at one or more injectors. That is why you do the testing!

 

Yes, reversing ground and that 5V would affect it...................I'd backprobe it to ensure all three pins are hooked up properly........I'm still thinking HPOP and a general housekeeping on all the o-rings, seals.............most o-rings out there start hardening after 50-60,000 miles and they're on a slippery slope thereafter...............