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Mines at the dealership now for exactly the same thing. They said it was a cracked y tube. I think its tripping the passive regen mode which is why your getting the white smoke. The first couple of times mine did it I figured it was normal passive regen but when I started smelling fuel in the cab and my mileage went to about 6mpg I decided to take it in. I'll let you all know exactly what it was when I get it back next week.
Got mine back last night. It had a bad crack in the passenger side y-pipe and a bad CAC, (Charge Air Cooler). There's a TSB 11-2-2 that addresses the CAC issue. Apparently the CAC problem is well known and gives the appearance that the system is going into Passive RGen if you've had the latest firmware update.
I guess I was sort of lucky in a sense. My Y-Pipe had cracked reducing boost and my EGT's were all working perfect so when the CAC dumped water into the turbo and compression/temps rose the EGT's saw it and dumped boost out and pumped fuel in to cool things down. That say's a heck of a lot for the active monitoring system on the 6.4L models. Saved my rear for sure. All my work was under the power train warranty and except for the two batteries I had them replace I walked away free of any charges.
I know some of you are running tuners on these motors and have removed the EGR's and DPF's. All that's cool if you're out of warranty and have the bank to pay for the repairs but if you're still under warranty, leave them stock and let Ford pay for your repairs.
Santa Rosa, Ca
08' F350 Super Duty 4x4 OffRoad. 6.4l, Fabtech 6" lift, Procomp 20" wheels/Toyo 37's, K&N Intake. 9" total over stock lift.
Last edited by sschefer; 12-29-2012 at 08:04 AM.