When it makes the noise, have you looked in the passenger side mirror for black smoke releasing from exhaust? With mine "pharts" when under torque
and shifting sometime going back and forth between 2 gears. Until 19,000 miles and a new MAP sensor it also triggered a CEL.
I also found that the Ford Powerstroke Forums have many with the 6.0 having the same issue if that is what you are referring to. I just had mine in again for the CEL issue related to the "trait" they have and that makes 4 dealer visits and the newest program that is supposed to help. They just do it and it is hard to trigger it with a dealer mechanic plugged in. Mine shows "excessive exhaust back pressure" which seems to tell the turbo to release
boost.
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2008 Gulfstream Conquest Super-C
with the International Chassis
"There comes a time in a mans life that he must
take the bull by the tail and face the situation."
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