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Mine will do it on cooler days <60F. It happens within the first 5minutes or so of regen when it's trying to heat things up and then I come to a stoplight and idle for a while so things cool back down. The instant I touch the accelerator, it'll belch a white smokescreen like pouring a full can lighter fluid on hot coals no matter how light I'm on the pedal. It clears up within a minute or so while pi$$ing off everyone behind me.
Ford says its perfectly normal. So we filter out the soot particles, but we belch raw fuel into the air to make up for it.
BTW, the most recent flashes display the cleaning exhaust message for about 2 seconds and then goes away. Mine doesn't even say cleaning complete any more either. Ford said displaying it resulted in more complaints than not.
'05 F150 FX4 SCrew
'10 F350 Lariat FX4 CC SRW LWB
Last edited by aquamans350; 12-30-2012 at 10:34 AM.