Originally Posted by MrKong
Whats kind driveability issue?
I use the cruise control a LOT. So when I drive a stretch of road @ 45mph going up a moderate grade, the wastegate or blowoff valve on the turbos would open and close rapidly causing a puh-chew sound to emanate from under the hood and noticeable bucking or surging of the vehicle. It was like the PCM called for more power but when it came it was too much so the PCM dumped boost to reduce power and the cycle repeated...rapidly.
Since the firmware upgrade, the issue occurs only 2 or 3 times on the same stretch of road versus 8-10 times before. It has definitely improved but not gone away completely. At this point, I notified the dealer that Ford needs to continue working on this issue but the jump in mpg makes it easier to live with in the meantime.