Long time lurker, first time poster. I have tried to gather all of the info I could from reading all I could find associated with my problem but am resorting to trying a new thread. I will give a basic issue of the problem then write you a book if this is the right place to do it.

05 F350 6.0 HD ran rough at steady cruising speed and while thinking sticky injector did anything and everything to ensure this was the problem. Last thing I did was change oil to T6 5W40 and put in the Hotshots Secret. Next day it fired up great and I could tell things were changing for what I thought was the better until I shut the truck off. Now it's a no start hot. Wait an hour and a half and it fires right up and runs perfect.

Is this the right place to start a thread to get a disccudisc going? If so I will type the lengthy story and go from there! Thank you very much!

 

 

I just got that set up a few days ago w torque pro so I have live data screen shots I can figure out how to post on here. I didn't know if I should go through start to finish what I had learned about the truck from the previous owner and what all I've done to this point as well. Thank you.

 

When you are experiencing the hot no-start, focusing on the cranking values for ICP (volts and psig) and for the IPR % duty cycle is the place to start. Read up on the air test for identifying leaks in the High Pressure Oil system. Dummy plugs and standpipes are the common and easy things to go after. If the HPOP discharge fitting hasn't been upgraded yet, then you should plan on doing that (installing the one-piece fitting). It could also be injector o-rings, or just a sticking/plugged, or bad IPR valve. This is where the air test helps.

 

Yes that's where I was headed next. May have to have some leak test it for me but I have new dummy plugs and a new one piece SCT headed this way.

Here are the codes I have:

P0261 cyl 1 injector circuit low
P0263 cyl 1 contribution balance
P2290 ICP to low
P0472 EBP Sensor Low (mine is unplugged)
U0306 FICM not flashed w PCM (I'd swapped a ficm to rule that out)

Didn't know if that one injector w both codes meant it was probably bad and would cause the no start hot so I was thinking possibly two problems.

 

Here are my scanned values:

KOEO cold
ICP volts 0.2
IPR % 14.7
FICM volts 49.0
Hpop 0

Idle cold
icp volts 1.0
IPR 27.8
Ficm 48.5
Hpop 791.7

2000 rpm hot

 

Sounds like a classic leak in the high pressure oil system. Time for an air test.

 

The good news is you have an 05, so it's likely not the HPOP since it's a robust pump on the later builds.
Bad news, from what I can see is you have a pretty good leak hot at least going off the numbers.

So yes, you need to start with an air test.
You can worry about the injector after the air test.

 

I'll bet it's the dummy plugs on the passenger side. How many miles?

 

210k for miles. It's a good truck though so I am committed to finding the issue. I will look up the ipc fitting size and make aa air Chuck and make it happen. I have to smarten up to remember where to test the driver's side though! Thank you all again. I will let you know what's going on.

 

That kind of miles,Id I order dummy plugs,stand pipes and nipple cup seals. Oh, and a STC fitting and dig in and get ER done.

 

Thank you I must be on the right track because that's exactly what I've ordered...I just didn't want to use a wrench until I heard from those more knowledgeable than I!

 

When was the last time the oil cooler was out?

 

I don't know about the oil cooler and the only reason at all I haven't freaked about it is the coolant temp vs the oil temp...I would change it out but temps are consistently 10 degrees apart. But...if you have a thought I am open to listen!

 

If your going in, I'd pull the oil cooler and check the screen under it and replace it with the updated one. Don't forget the screen in the IPR.