CM2250 Regen Confusion

[Billdozer2]

(04-29-2016 )Unilevers Wrote:  passive regens take 1hr max - if it is going longer something is wrong. the injector should not turn off and on and the temps should rise and hold fairly steady then fall for the cool down.

All of my passive regens have taken less than an hour. I think one took close to an hour, but figured it was because I was rolling though some hills and the exhaust never got hot enough. I was really confused when the injector would turn on, the DPF intake temp would drop to 550 or so, DPF output temp would come down but slowly and only to 750 or so, and then the injector would turn back on raising both the input and output back to 1100. Now I know that is not normal. Great.....

(04-29-2016 )Unilevers Wrote:  in the aft. history pic your dpf is plugged - the numbers are too high and too close together. it also only came down to 2.2 after a full regen which is still marginal. a properly functioning system will regen every 8-12 hrs of operation - 175 miles between is crazy and that truck will very soon get stuck in the dreaded "constant regen" cycle

Well, I did my normal run today and after performing that forced regen last night, the truck did not regen until about 250 miles of driving. Which is better (Yay!) But still looks like it is not good enough. (Boo.)

Do you think performing an EGR/sensor cleaning/replacing will help? Or should I pull the DPF and get it cleaned? I'm kinda bummed cause it was just cleaned 70k miles ago. Although I did not see the end result other than a Repair Order that said the back pressure was around 1.2 if I remember correctly.

(04-29-2016 )Unilevers Wrote:  cm2250's run smaller turbos than 871's so the turbo speed is higher, the vgt position is higher, and the exhaust pressure is higher - that is normal.

Thanks for the info! What about the Intake Manifold Pressure? In the youtube video it was around 10inHg during the regen. But mine is up in the mid 30's while regenning. Just a CM2250 thing as well?