Join Date: Aug 2019
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Interesting 03' 6.0 Issue, Help! PO278
I am aware this has been discussed many times before, however money is tight and I cannot afford to throw parts at the truck at the moment. The motor has Studs, CAI, Alliant 155/30 injectors which are 1 year old, Coolant bypass kit, EGR is deleted, Blue spring mod, 4" turbo back with a muffler, and the fuel filters and oil filters have always been changed with OEM materials, and Rotella t6 with Archoil Fuel and Oil additive. The truck is running the motor and trans safe tune from PHP.
The issue, The truck idles OK with a vibration, you can feel it in your seat, and driving in OD also gives a vibration, almost like a out of balance tire. If you ever so slightly push the accelerator, it will almost buck, as if it was confused. It does this very rarely. It has plenty of power, Starts easily, doesn't smoke anything- ever. Drives well aside from the vibration, I thought it felt off so I pulled the Codes via Insight CTS2, Got a PO278 code. Wiggled the harness, no change. Unplugged #6 Injector, motor immediately began to miss, plugged that back in. All cylinders passed a compression test. FICM voltage never drops below 50. Does not leak oil, coolant, nothing. Some common values at Idle speed are as follows. The ICP looks low to me, so I am suspecting a ICP sensor? Could that cause the code and rough running? I will be conducting a buzz test when my buddy finds his laptop.
IDLE SPEED, warmed up
FICM sync: 1
Any and all help is appreciated, have a long trip coming up, and looking to get this resolved quickly. Thanks!