DPF Issues... (Update page 4, March)

[Toms306]

UPDATE 23/3/15

I f*cking hate DPFs.

So basically, it's been feeling a bit lethargic again, thought I was just getting used to the power but it seems not, the regen duration fault has come up 3 times in the last month now.  So did some live testing today, 1st run from cold, 10 miles of B road, 10 miles of dually, 3 miles of town.  Second run warm engine 3 miles of town and 15 miles of dually.  

Coolant temp, glow plug operation, EGR control and VNT vanes all working well on both tests.

1st run:

DPF pressure Max - 12kPa
Rough average - 3kPa

DPF temp Max - 338c
Temp during const' 70mph - 280c


2nd run

DPF pressure Max - 9kPa
Rough average - 3kPa

DPF temp Max - 324c
Temp during const' 70mph - 290c


So it turns out 70 in 5th isn't getting the DPF anywhere near hot enough to regen passively which seems daft. But more worrying is the pressure in the DPF...bear in mind its only 3 months old and covered around 3k miles.  

I did wonder if maybe the DPF wasn't the original issue, but after changing it the fault didn't occur for nearly 3 months...

So I'm looking for a genuine knackered DPF to gut now. But have I over-looked anything simple before I go to the cost and effort of removing it? Pipes are intact and pressure sensor appears to work ok.