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Well, if the FCIM voltages all check out (main power 48v, logic power, and key on power), HPO system checks to be fine with correct ICP pressure/voltage, correct IPR%, crank and cam signals are in sync to the FICM and PCM, fuel delivery has been verified with steady pressure....All of the above parameters were met when diagnosing my truck too. When I did the cylinder balance test, it showed cylinders 2 3 5 8 were off. These were all on the X2 connector at the FICM. Even though the FICM voltages were correct, the logical side of the FICM was still corrupt.
Have you performed a cylinder balance test? Buzz test the injectors at KOEO? With engine warmed up, turn off the injectors one at a time and see if the condition changes. It may help narrow down your problems.
Last edited by fixxxer-upper; 12-31-2011 at 09:16 AM.