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

[Toms306]

So did a longer test today, with interesting results!

With ignition on, engine off, there was no pressure differential reading.

Graph key -

Red - distance until DPF is full of ash (irrelevant)
Green - distance since last regen trial (note, 'trial' not completion)
Blue - DPF pressure differential
Pink - Post cat/pre DPF temp
Yellow - RPM
Purple - Fault codes caused
Light purple - Coolant temp
Orange - Speed (KPH)
Red - Torque (any idea how this read lol, or is it just guessed? )

So, nice sedate drive, mpg rising - stop at roundabout then give it some onto an uphill NSL road - DPF pressure hits around 9kPa, temp is only around 200c and the fault code is thrown up (jump in dark purple line lol). Pressure then rises to 13kPa and temp continues to rise to 500c as it tries to regen - cry as mpg dropping off lol. Though seems odd the code comes up before anything (temp/pressure) are unusually high??



Have to stop a short while later, fans running, think regen hadn't completed though. Another hard boot onto an NSL road sees it hit 16kPa (and 4444rpm lol)...



Later on, regen trial occurs but DPF temp doesn't rise so assume it was aborted, uphill in 3rd and it's hitting 13kPa again...




I don't understand why the code was thrown so early? But it does explain my poor motorway mpg....every time boot it, the pressure rses more than its expecting so its trying to regen!