2003 7.3 Liter F350 running rough (missing)

[rexpendergraft]

I have a 2003 7.3 Liter F350 diesel that has a problem in that after running a few minutes (15-20 minutes) and it is warmed up it starts missing especially when under a little bit of a load: Meaning going up a hill versus on level ground or down hill. Also I use 100% or less bio diesel for fuel depending on the outside temperature.

What I have done so far:

1. Drained all bio fuel and removed the fuel tank and inspected for anything that would cause fuel starvation (i.e. clogging, debris, junk, bio diesel residue,… etc). Tank was clean and suction screen clean on sending unit. Remounted tank and filled with new regular diesel fuel.

2. Removed and replaced frame rail mounted fuel pump.

3. Installed new fuel filter.

4. Removed and install new Injection Driver Module (IDM)

Problem still exists and error codes still point to the IDM as the problem but this can't be unless new one was also bad.

Truck starts and runs great when cold but after a few minutes the engine starts missing and rough running with ever decreasing power available (especially under load). If I am going up a hill it will actually stop (engine shuts off after coughing and sputtering).

Has anyone had the same problem and what do you suggest next.

[rexpendergraft]

UPDATE:

Today replaced the ICP (injector Pressure controller). Before this ICP replacement I had a 1212 (ICP bad) and a 1298 (IDM bad) code. Now the problems still exist and there are no codes set.

Now I think I am really up the creek.

[Bad Night]

Did you ever figure this out ? Have a friend w the same problem.

[highraven99]

my truck was doing this almost exactly a month back, except mine never died. the last thing i did fixed mine. i replaced my cps, all i can figure is it was getting weak and could tell things as good. dieing is also a symptom of a cps.

[dmd]

When a CPS gets warm, that is when it goes out if it is starting to fail.. When they
cool off they will work fine again.. It is a cheap part now, worth a try.

Some just go out, and some just start having problems. Did you get the CPS recall
done? If not you can get a CPS for free, just have to schedule an appt with they
dealer... I would just buy one and put it in, less of a hassle.

[rexpendergraft]

Originally Posted by Bad Night

Did you ever figure this out ? Have a friend w the same problem.

The problem is with the mixing bowl screens inside of the fuel tank sending unit. Remove the tank / remove the sending unit. Disassemble the sending unit lower end and remove / clean / reinstall the screens. I know of 2 different trucks where this was the problem and the associated fix.