Originally Posted by lubbockguy1979
to best awnser your question. when replacing the ficm, ford will typically update the ficm tunung to the latest flash which is good and bad. not going to get into that. iirc the dont have a choice as to reflashing the pcm and tcm. if you had aftermarket tuning loaded to the pcm it was over written. the loss of power could be attributed to 3 things. the loss of aftermarket tuning. a different ficm tune which is probably detuned from what your probably had. and lastly again a different pcm tune which is likely also detuned from the original. i would do a little reasearch on ficm tuning and pcm roll backs. this will give you more insight on the issue, as far as aftermarket tuning your on the right track with the sct and custom tuning.
Seems that the tech reset everything on me, FICM and PCM, with the latest flash for the 6.0L, so I'm running totally stock now.
I've been doing a lot of research on the threads on this forum and must admit my head is spinning a bit trying to make sense of the difference between CHIPS, PROGRAMMERS and TUNERS, etc...
Thanks for chiming in and clarifying on the original question.