Antara 2.2 DPF Regen Cycle Info
Dear all, I have a 2.2 CDti which has caused me grief. Sorry for the long post, but important for owners.
Someone removed the dpf internals before I bought it and it failed the mot during lockdown 1.
I purchased an aftermarket dpf and that blocked. Egr issue.
Finally the non vx dealer agreed to fit a second hand refurbished dpf.
Since that and being nervous I brought an odb reader and started monitoring. Watching the soot levels rise and driving like mad to reduce them, I struggled.
Reading on here some suggest it regens at around 500 miles. I now know this is correct see later..
I lost my nerve, reading tales of above 80% blocked will need a forced regen so I had it forced and started a fresh.
Usual driving (4th @ 60-70) seemed to give a 220 to 300 degrees temp in the dpf (higher the gear less temp).
I noted small reductions in the dpf content (passive regens) from this but to be honest I usually added more in than I took off during the drive.
I tried 50 in 4th, driving in 3rd screeming it, nothing would create a regen or decrease the soot level substantially unless you drive at 80 + in 4th (cough)..
This time round lockdown 2 helped, couldn’t force a regen, nervously watching the soot level rise again and after it got to 85% full I noted some higher temperatures in the dpf for short instances. These decreased by up to 20% but no regen.
Reading on here again I started driving at 60 in 4th holding as close to 2 -2500 revs as I could.
There were short spikes of 450 degrees occurring at around 400 miles since the last regen. These dropped the soot by 10 - 20 % and gave me hope. I think this temp is an effect of the back pressure of the blocked dpf (not a mechanic but makes sense).
Today I drove again, hoping for a regen and it happened.
The log showed the same small spikes and my soot level went from 90% to 60. Temp 400 but nothing like the 650 degrees. On the way back the car suddenly started a regen (17 mpg etc as described elsewhere). I looked and the soot was up at 100%! Strange I thaught, was only 65 a minute ago.
The odb read out on review shows that at exactly 500 miles the soot went from 65 to 100 and the Dpf temp rocketed to 650 degrees.
So, it seems that there are two triggers for a regen:
100% soot content
500 miles since regen (this may differ in software or versions)
Until either of these are fulfilled you won’t get a regen which is why some people have shorter distances between regens.
The ECU must override the soot context level or pressure sensor to force a regen cycle. I wonder if you can do that via odb?
Seems daft to wait until 100% I’d rather regen at 75 myself than risk a blockage. If anyone knows how to change this please let me know.
I’m hoping this helps someone and maybe stops them wasting fuel in vain.
It may also help in marital relations, wife was not happy until now.