I apologize if this has been touched before but couldnt find anything on an 03.245000 miles,bone stock no mods. I replaced HPOP,ICP around 190000 miles,had 6.0 tech do it on side.
Replaced injectors as well,has number 1 and 2 fail at 245k. I replaced these myself,it has the log type oil rail in it. Not being able to get a tool to remove the HP stainless oil line I just picked up rail and did injectors on both sides. Truck ran fine for about 2 weeks and all of a sudden started dieing when I suddenly let off pedal. Did this erracticlly then when using AC got worse,now it does it pretty often. Idles and starts fine no problems,can even keep it running if I catch it quick enough but when you get to around 70 under load it starts to buck a little.
I have changed oil,air,fuel filters just to make sure and still doing it on a regular basis after it gets hot. It just dies and will crank back up after a few seconds of starting and then runs fine for a while.
Any help would be appreciated on which way to look. Getting ready to sell the thing and cant do it in the condition its in. Thanks guys!

 

Check your fuel pressure

 

Tim is Right need to check Fuel Pressure, also what is ICPV saying when acting up, try unplugging ICP connection and see if this helps if so Pig tail connection would be in order also any oil out the back of ICP or in connection?

 

I replaced the fuel pressure regulator spring and housing just because I couldnt find the fitting to attach to check pressure at the time. I pulled valve cover and I had messed up the oil fitting/check valve on the oil rail. Put everything back together and it starts up fine and idles great,even sounds better running. Ran it for about 20 minutes and cut off 3 more times before I could get home. Did a rolling start just to check performance and it will fly like it always has. After that I drove it about 5 miles and it didnt cut off when coming to a stop or turning.
As far as the ICP I dont have a live data scanner. I cant see or feel any oil from the ICP sensor but mine is behind the turbo so its hard to get to. If you guys think it still may be the ICP I may just have to take it to a shop and have them diagnose it. Thanks guys.

 

The scan gauge would help for Info ? like if the ICP has the pressure needed for the IPR , the IPR if no screen make allsorts of problems , and the ICP volts could do it as well, on your year pulling the FICM is the only way to get a good shot at both, I would save your self some Dealer money and do it your self, not that bad of a job . and try Riff Raff diesel products for the OEM parts, you may have to get the ICP Pig tail from the dealer.

 

yeah the ICP I have changed before not that bad. I think I'm gonna take it to an individual shop and have them scan it. I just need to get this fixed so I can sell the truck. Thanks again and will let u know when I find out what it is.

 

Some but not all Auto Zone will scan your truck for DTCs just write them down if any and we can help