2005 Excursion with late 2004 motor, 250,000 miles on the clock. My friend was low on fuel. Lost power and pulled to the side. He had a transmission code for a stuck solenoid(don’t remember which one ) that has been resolved with a fluid change. Has not been driven enough to see if that one will come back or not. Back at his house now. Super rough idle and codes as follows...p22849icp circuit range and p2288 is too high. Had cylinder contribution codes for a couple of cylinders that i cleared and they have not returned. What we have done...New Motorcraft ICP sensor and pigtail. Also,since low on fuel and no history of filter change i put new Racor filters in. Interestingly I did not get the normal diesel bath when changing the filters. Also the secondary filter bowl was empty of fuel. This led me to a fuel delivery problem. I removed the fuel return line and fuel supply line from the hfcm and ran hoses to a can of diesel. Filter bowl fills up quickly. I was hoping for a pump issue which this seems to eliminate. Still rough as heck idle. Rented a fuel pressure tester and with Koeo I have 65 pounds. With engine running it stays at 65 according to the pressure tester. Any and all suggestions welcome. Thank you.
Update. Just went out to check the codes and fired the truck and for the first time the idle smoothed out and sounded great!! Unfortunately or fortunately I pressed the accelerator and back comes the rough idle. A clue I hope.

Thanks Jack. Chris here. Cylinder 8 once and moved to cylinder 4. I don’t know if you saw my edit that I just had a great running truck for a minute until I touched the accelerator. This is with the fuel lines hooked back to tank with a 1/4 tank of fuel. Thanks.

Just added another 10 gallons of fuel. Tank at a smidge over half. Same scenario with a smooth great running truck touched the brake and the idle went down and back to terrible idle. Let it idle like that for what seemed like forever and it did not smooth out again. Still have the ICP codes(2284 and 2288) and the cylinder 8 contribution is back. Surprised there are not codes for all the injectors the way it runs when rough. Is it possible that it is still needing a higher fuel level? Also of note is no smoke of any color while this mess is going on.

We ran some diagnostics. Here are some of the values...
KOEO/KOER
ICP .25 Volts / 3.1 Volts

We compared to a good running engine and only these one stood out as off. Which makes sense we are getting an ICP too high code. We had just changed the ICP sensor with a motorcraft ICP sensor and are still getting these high values. Is there any other reason why these would be so high other than a bad sensor?

Thanks!

Thanks for the video Smackdaddy. The truck is an hour away so this will be a drawn out deal. I will swap in my known good ICP sensor(should have done this first but sometimes you miss the obvious) and check the connector for voltage. I am leaning toward #8 injector especially with the high mileage and being originals I think. I wish I knew if a sticky injector would cause the ICP codes. All the injectors passed the click/buzz test by the way.

Thanks Bismic. Using Forscan Lite for ios. We did get the 2288 ICP too high and 2284 ICP sensor circuit range. We only changed the sensor once. Sorry for the confusion. I was using an ipad with autocorrect on that I hate and had to proof read to correct its corrections. When this didnt help with the codes or rough running I then changed the pigtail. Next time I am out to the truck I will check voltages on the wiring although I think I matched it up correctly ,but the 2288 and 2284 codes remained. I agree about the injectors. #8 and # 4 popped up with #8 coming up twice now. So I guess an injector can stick and then be fine and stick again randomly which explains how it could smooth out nicely then go rough again. I did not think of it at the time but next I will swap in the ICP from my F350 to eliminate the sensor. Oh and we did unplug the ICP once while it was running so that might explain the 2284?? Thanks again