Originally Posted by aquaman

If any of you are interested in seeing how regen works, here's a temperature profile of DPF pressure, EGR11,12,and 13 of a full regen cycle and one that I had to shut down prematurely that I captured on my truck with my AutoEnginuity scanner. Note the relationship of each one with respect to the others as things heat up, as it cooks, and as it cools down after regen stops. Note DPF pressure is pegged during heatup due to fuel being burned and therefore creating more backpressure

Stopping the regen while it's heating up results in wasted fuel trying to heat it up before it did any good, so it's best to let it run as long as realistically feasible. Even after shutting it down (neutral or park), it'll continue to burn a bit on its own for a bit, so I'll idle a minute or two to feed it air as long as the outlet temperature doesn't drop or continues to increase

https://www.ford-trucks.com/forums/p...ictureid=98080
https://www.ford-trucks.com/forums/p...ctureid=111534

I will belch smoke during the heatup phase pretty predictably on 'cool' days. It'll belch as soon as I hit the gas after idling at a stoplight; sometimes it'll smoke while it starts while I'm on the freeway and already heated up

I have some other pics in my gallery with some other graphs that I used to show the dealer my smoke issues, but they all said it's normal :-(

BTW, documents talk about passive regens... I'm not sure there are any of any significance, even as I'm going up the I-5 GrapeVine with the DPF cooking at 600F. If anything, I get a regen as soon as I crest the hill. I have yet to see anything burning hot enough on its own to notice any difference in DPF outlet temperature relative to inlet temperature