Originally Posted by rotorhead1250
Oakman, I dont know what a regen is? I'm a 7.3 owner and for us if its white somke, thats normally unburnt fuel. Does this happen on startup? If so its prolly a glowplug relay or several bad glowsticks. If its light color (could be mistaken for white) it may be oil bypassing the turbo and would lead to a turbo rebuild.
Regen = Regeneration of the Diesel Particulate Filter (DPF) on the 6.4 liter Fords. During a regeneration, extra fuel is dumped on the exhaust stoke to increase exhaust temperatures to burn out the accumulated soot in the DPF. This is the reason for the poor fuel mileage of the 6.4ís. When the engine goes into DPF cleaning a message is displayed on the message center.
The white smoke occurred twice during a DPF cleaning that I interrupted by returning to our campsite before it was finished. This was also a rainy/humid day so I can actually buy into the condensation explanation. The white smoke only occurred at lower speeds for a short time and once the DPF cleaning was complete it didnít occur again. It was enough white smoke that it looked like a gasoline engine with a blown head gasket for about 10 seconds.
It was embarrassing to be driving in a state park and belching out a ton of white smoke.