In April I was driving my 2005 F-350 6.0L up a mountain when the turbo blew, I turned the truck around and coasted it back down the mountain to our home. The truck sat for about 3 months before I could replace the turbo. I got it replaced and now the truck starts and idols hard. The truck doesnt have power and the turbo only boost to about 20 psi. I ran it on OBDII and it came back 4 injectors bad (P0264 #2, P0267 #3, P0273 #5, P0282 #8) so I checked the FICM and its staying constant at 48-50v while running. The truck run great before the turbo blew. Also had to replace one of the batteries and have the other one charged since it sat for 3 months they were dead. Why would my injectors go bad all of a sudden, could it be the harness or the FICM even though it shows good volts?

 

Yep you or who ever did the turbo likely knocked the wiring harness loose from the ficm. Just wrap you hands around the ficm (one hand on each side) and with your finders squeeze each harness connector up into the ficm. I bet you will find them loose. It is weird that it is 2, 3, 5 and 8 as they cross the engine e.g. not one harness... There are three plugs on the ficm. The right bank of injectors, the left bank of injectors and the main harness from the truck to the ficm. If you can't run it back to the people who did the turbo, then i would make sure the plugs are plugged into the ficm and then under the intake (between intake and valve cover) you will see small black round plugs. These are the connection to the injectors. Don't pull but make sure they are seated. They are held on with C clips and it is easy to break the plug if they are pulled on.

If the output power from the ficm is good then it is not likely the ficm itself. It could be but the logic board does not usually go bad. It is possible the ficm lost sync with the main computer but is not common. If all of the wiring checks out then that would be the next step. If you have an edge insight or scan gauge 2 you should be able to see if the ficm is in sync.