First, some DPF maintenance basics. The active and passive regeneration process routinely burns off soot collected in the filter during the engine combustion process, which keeps clogging at bay. But the system may also require a forced regen while parked.
The forced regeneration process can take up to 30 minutes. DPFs require more maintenance than catalytic converters. The ash from the engine oil accumulates on the inner walls of the ceramic and in the pores. This increases the pressures in the DPF and if clogged, can even damage the engine. Therefore, the regenerative capability of the DPF is
Problem with gutting the DPF is that when the ECU tries to execute a regeneration cycle with nothing there it never brings the temperature up to burn out the soot. Meanwhile the ECU is dumping raw diesel down the exhaust in attempt to light the DPF on fire. The fault code appears not so much because the DPF is gutted but because the regen failed.
Whereas a passive regeneration can take anywhere from 20 to 40 minutes, an active protocol can take upwards of one hour or longer. More important, the truck or farm machine must be parked and not in use. The most desirable procedure is the passive regeneration, since it keeps the unit in service and is the gentlest on the DPF.
Good luck actually getting a solid answer on that. I chewed 2 turbos, 3 ECMs plus reflashes, O2 computer, O2s, cat, dpf, anything and everything that would be part of a regen or what trigger one and my truck would not regen. Ultimately they put my truck on a supposed constant regen. Truck ran like Azz and was getting a whopping 9mpg unloaded.
DPF problems: How diesel particle filters actually regenerate | Auto Expert John Cadogan Share Watch on Too much misinformation is being served up about how DPFs work and how they regenerate. It’s time to sort that out, here and now
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how to regen a dpf filter
