159 Cruiser and
AO Silver Member
Join Date: Jul 2012
Location: United Kingdom
I Have a 2.4 diesel.
Is there a way I can tell whether DPF regen is occurring?
Increased MPG and the Boost gauge dropping quickly (as above some people claim the engine note changes, but I could never hear it either!)
How often does it occur?
I understand that it is set to occur either on a time based basis (around 15hrs of engine running), or when the pressure sensor in the DPF goes over a set value.
Does different driving styles affect the frequency of or need for regen?
See above. basically unless you are blocking it early it should not change it, set number of hours.
How long does it take for regen to complete?
On the 1.9 it always used to take nearly spot on 10mins
What happens if it is not completed?
It will try and regen next time the engine/ exhaust is up to temperature.
Is perfomance affected while regen is going on?
It should be, as there is a combustion effectively going on in the exhaust, will increase back pressure slightly. The EGR also closes when the regen is happening, MPG will be affected, and it 'waters down' the oil slightly ( as Diesel can get in it).
I have occasionaly noticed fuel consumption to rise if I have current fuel use displayed on the dash. I have also noticed an occassionalengine miss while travelling at slow speed. Are these part of the process?
Yes to the former, not 100% sure on the later, probably not.
159 1.9JTDM Ti and Giulietta 2.0 Veloce
ex: Punto 55s, Golf Mk5 1.4FSi, A3 (8P) Sportback 2.0TDi SE, A4 (B8) 2.0TDI S-Line, 306 HDI Meridian