Short n sweet, my truck has been abnormal in regen mode every day every start up all day long for about the last oh 5days? All mostly city driving has 67 k on the odometer. I'm really getting concerned because I've had the truck for three years and have never had it do this so bad! I'm taking her to the dr. On Thursday! Any advice on probable causes???

 

I would guess a bad sensor but I would take it out on the highway and run it hard through a regen and see if that fix's it. High constant speed as fast as possible without getting a ticket and see if that works.

 

Get it out and get the regen done.

 

We'll I ran her up the highway 65 mph for say 10 miles and it did the trick. I just don't like this dang regen,it's a real pain ya know! Thanks for the replies.

 

I also do a lot of city driving with my 6.4, my mechanic will do a manual regen from time to time at no charge for me. Keeps it from going into regen for a good while.

 

Yeah, it's a royal PITA. I have to plan my trips when I'm due for a regen usually every 250miles or so to avoid a regen in city traffic. If the truck feels constipated and about to do it, I'll drive my F150 until I know I need a freeway run...then I'll take my F350 out on the road and let it do its thing.

The real pisser is it isn't always predictable and it sometimes won't regen until I get home after a 120mile freeway trek.

Keep in mind the first 5 minutes of regen is spent heating up the DPF when coolant is >160F. Stop-and-go traffic will never heat it up to do any good. Until the DPF gets to about 800F, nothing happens, so if the truck is shut down before then, all that fuel spent heating things up was wasted and the truck will restart regen the next time it gets a chance. The bulk of the burn seems to occur in the 2nd 5-10min while the DPF is cooking 1100-1200F, then it starts tapering off. In cold weather, this is murder since things take much longer to heat up.

In cold weather, or if I'm in stop-and-go traffic, mine will belch white smoke during the first 5 minutes as it's heating up even while idling. It seems if the soot isn't heated up fast enough, it smolders and smokes as it starts to burn.. Smelling vile doesn't describe it enough. I originally thought it was an overfueling thing, but it appears to be soot related or both. Ford says it's normal. LOL

 

Do all 2008 diesels have a regen tank?

 

You mean a DPF filter? Yes... every diesel since MY2008

Beginning with the 6.7L MY2011, there's an additional DEF/SCR tank that holds urea and sprays it into the exhaust to cut down on NOx emissions