NOX/SOx rgnfltr is at 7.6gm, De-SOx trigger point is 5.9gm

[beezer]

Have an EDGE – INSIGHT digital gauge indicating 7.6gm with a regen trigger point of 5.9gm. Yet there are no CEL’s or DTC’s. This seems weird, Is this a problem for plugging up the DPF? Does NOx/Sox regeneration take place in the DPF or elsewhere, like in the smaller Catalytic exhaust chamber upstream from the DPF?
1
A couple of years ago the SOx level got up to 6.9gm before regeneration took place, dropping it to 4.4gm, and it was about the same time of year also (Late February and very cold that year), when I don’t drive the truck much. Last week, after truck had been sitting for about a month, I pulled a 6000# trailer almost a 100mi and back, mostly at 55mph highway miles, with SOx starting out at 7.3 and ending up at 7.6; so am thinking soot regeneration was passive( not active regen) most of the trip due to higher towing EGT temps. Am guessing an active regen is needed to trigger the De-SOx regen???

Thanks. Bruce.

Odometer 24,273mi
Most recent (that I know of) ECM flash = J36 recall notice for the updated ECM flash part number “BCU#72351430BK”, performed 5/3/2010

 

[beezer]

On further review of the forum, from Mullenax’s regeneration article and others, looks like the SOx regen takes place in the Catalytic chamber (and does need a high 1125F temp, ie-active regen mode to achieve it) and not a concern for plugging up the DPF.
I’m going to quit worrying about it.

 

[DonFitzwater]

"I’m going to quit worrying about it."

Sounds like a plan! :-laf

 

[wiley75]

You are on the right track. The DPF will not be "plugged up" by oxides of nitrogen or sulfur. It only cares about particulates.