"Regen"??

[TJNE]

I have been reading about "Regen" in some of the posts. Will someone explain this?

[SuperPRO56]

Its a cycle the engine goes through to ensure the diesel particulate filter (DPF) is doing its job. Basically, its sending extremely hot exhaust gases into the DPF to clear out any soot built up. Its a somewhat new term, only because the newest trucks are the only ones outfitted with a DPF, due to tightening emmision standards. Older generation trucks, LB7 as an example, do not have a DPF, therefore do not require a 'regen' cycle.

[TJNE]

I have an 07 LBZ. Where is the filter? Is it a fliter that needs changing peroidically? What is the function of the DPF? Thanks again.

[Rabbler]

Your 07 LBZ doesn't have a particulate filter.
If it was built after Jan 01/07 you would have the LMM engine and a particulate filter.
Generally the DPF is right behind the catalytic converter. It captures then unburnt fuel particles (soot) and prevents them from flowing out the tail pipe.
It is supposed to last "the life of the vehicle" but we'll see if that is true.
The regeneration cycle is supposed to burn off this accumulated soot periodically.

[madmatt]

actually the LMM doesn't have a catalytic converter. It uses a Diesel Oxidation Catalyst (DOC) to heat the fuel induced into the exhaust when injected into the combustion chamber during the exhaust stroke. The heat built in the DOC, which is upstream from the DPF, then burns the soot out of the DPF leaving only ash behind. The ash is never removed and builds up over time eventually requiring replacement. Normal regen is trigger by amount of fuel used, milage traveled, run time and exhaust differential pressure. Service regen is required when a normal cycle doesn't get the job done and has to be done w/ a Tech 2.