Join Date: Oct 2012
Location: Tri-Cities, WA
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To eliminate possibility of coincidence...
Change the FICM. Personally, it wouldn't surprise me if that is indeed the problem. REPAIRED FICMs are a bit of a gamble. Just think about what's been done.....someone opened a computer (that's what the FICM is, after all) and fiddled with the guts....probably soldering the capacitor banks, and a few other "questionable" areas know for solder cracking. This is all well and good, but solder likes to pop every now and then...and it only takes a small chunk of loose solder floating around on a printed circuit board to cause problems. And NOT Always is it a case of loose solder joints...caps and components go bad....the repair guy could have missed something. Does he have a means to test the full function of the FICM after the repair? Not too many individuals have that level of testing equipment.
I work on these 6.0 for a living. I have never advocated the use of "repaired" FICMs....and I DONT have any stake in parts sales.....so that isn't the reasoning. Unless you know for sure EXACTLY how the repair was performed, AND more importantly, how was the repair VERIFIED for proper function before shipping back to you... then you can't rule out the possibility of the FICM being responsible for the new noise.
It could be simply that something in the ficm is changing a value that the pcm sees just enough to delay or mess with the bypass function of the turbo. Which sounds like what you have going on.....the whooshing noise should cycle in and out during idle to control engine temp...but defeat its activity when the accelerator pedal is depressed off idle.