Originally Posted by
threefootsix
Ok so that should be the 148/150 hp RHH motor running delphi DCM 3.5 injection.
It's actually a pretty good engine and that injection version doesn't create a lot DPF issues. Having said that at 290k there will a reasonable amount of ash load in the dpf so the time between regens will be shorter.
Re the p2002 code, you will need to get it on some gear that can at least read the live values from differential pressure sensor. The value at idle will usually be some where from 0-10 mBar and at WOT stationary 65-120 mBar on a functional but aged dpf with is engine.
If the value is not changing from 0 bar the ecu will log a code as there will always be some rise, even on a brand new part, due to the nature of the core . Given that you've seen the core (and I'm assuming that there wasn't a big hole drilled down the middle...) and that there is unlikely to be a fist-sized hole in the exhaust upstream from the dpf, the most likely culprit is a failure of the dpf sensor.
If there is a high sensor value (ie >250 mBar at WOT stationary) this is pointing to a blocked dpf. A static regen will improve this but as the accumulated ash load can not be burnt out of a dpf the time/distance to the next regen will be relatively short. Only an off vehicle professional clean will get rid of that ash properly.
So here is the plan forward:
Find a real diag tool and someone who knows how to use it and verify the DPF sensor operation.
If it's fucked then replace it, verify operation, clear codes, perform static regen and confirm pressure sensor values after regen. If that's all good you then change the oil and filter and drive off in to the sunset.