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2003 6.0. Miss when hot, P0275
A while back I picked up this truck for a project. It ran rough and had a miss when cold, or when in overdrive, but otherwise ran fine once hot. I had it looked at by a friend who is a ford diesel tech. He brought over his lap top and ran cylinder balance test and failed number 5. Also said 3 and 7 were low. Truck was not throwing any codes at the time, and once it was hot seemed to run normal.
I changed all 4 injectors on that bank, 1,3,5,7. I also sent my ficm away to ficmrepair.com and had them fix it as I was getting only 40 volts when cold. While I was inside I also replaced oil cooler and updated fuel pressure spring to the blue spring. New filters and oil all the way around as well. I put it all back together and flashed it up. Ran perfect cold. Once it was hot I noticed a stumble, worse then before, and throwing P0275 for cylinder 5 again. I then suspected FICM harness as the x2 plug was broken and held onto ficm by wire ties. I ordered a new harness and installed. Still have same result. Rough when hot and P0275.
Now this wouldn't be the first time that I have heard of a injector being faulty right out of the box, but what are the odd's it would be number 5 again, the same injector as before.
Any ideas? If I were to venture a guess I would say maybe a slightly longer crank. About the time your brain thinks hey this should of started, it starts.
No other faults other then P0275
FICM voltage at 48 volts at all times