jtq4u wrote:

I do also get the separate error relating to excess ash (DPF differential pressure too high). I don't think there is a 'I am full of ash' specific error on the L322,

I do wonder if garages ever use the right oil. No one would ever know.
A few years back one of my family uv marked all the bits the land rover dealership charged to work on during warrenty and even the dealer cheated.. a lot. (for which hell was raised).

Oil fraud is almost the perfect crime.

But the damage to my dpf is likely related to the previous owners ignoring oil change demands from the car and having oil over flow out the crank case pcv vent. I have the paper work for land rovers repair work which didn't include any dpf action but I imagine it was very traumatic for it.

I am hopeful the shed load of smoke from my cleaning activities might be some of this badness breaking free.

Ultimately it will be tempting for the dpf core to go missing shortly otherwise.

Click image to enlarge

JayGee wrote:

jtq4u wrote:

I do also get the separate error relating to excess ash (DPF differential pressure too high). I don't think there is a 'I am full of ash' specific error on the L322,

This is significant. Either the DPF ceramic core is full of ash which is unlikley at that mileage unless the wrong oil has been used for it's entier life or the metalic cat infront of it has colapsed due to excessive heat from too many forced regens or use of DPF cleaners which can raise the burn temp.

When I have looked at the codes on a red error in the past I have also sometimes (always.. can't remember tbh) seen an insufficient flow from egr. Got round to taking the elbow pipe out this morning and no wonder why.. the bit that goes into the manifold has 8 holes apparently. There was only one that wasn't totally gummed up.

I wonder if missing regens triggering red can then cause the high pressure diff error too.

That won't help with my crap dpf capacity but I suspect it will stop the reds (as rr won't regen if there are egr issues as I recall)

Click image to enlarge

The EGR valve is shut during regeneration so this won’t make any difference but it shows you have an issue with excessive soot if it’s blocked like that. 2012 TDV8 Vogue (L322)

I think it does make a difference, as there are warnings on the forums that blanking off the EGR on the L322 4.4 stops regens.
eg: https://www.fullfatrr.com/forum/post663529.html
Essentially I had a 'natural blanking' of mine

I assume the car stops regens when there are EGR issues, as the workshop documentation suggests the EGR is involved in the strategy - namely it has to be closed or the DPF can't get a high enough temperature to regen.

I do think that if too lower flow is going to cause an EGR red it should give a MIL in advance! It doesn't though.

Perhaps it is a punishment for those who blank them off

So far with the clean EGR and DPF i've covered a couple of hundred miles and things are behaving well.
Not enough miles to be sure yet.

However i am strongly tempted to remove the core anyway, as people have suggested this has an improvment in mpg.

Ok so 40 miles around the town still takes it from 13 grams soot to 23 and Amber warning. Including 2 missed regens.
Ni camt remember the gram level for red.. 28 I think?
So maybe another 20 miles if it stays linear.

Not great at all capacity wise (either because of ash or because of over fuelling.. its been air tested but the injectors could be leaky).
If dpf has a meeting with a hammer and welder it would be interesting ti see if it is smokey when unfiltered!

For L405 its as below, dont think there will be much difference on a L322? should be in the WSM be careful the regen will be inhibited very soon and never believe in linear!

 2018 SE SDV8 4.4 Byron Blue

Thanks.
Took it for a 10 mile motorway drive and back down to 6g now.
Buys Me some more around the town time.

What's your mpg in town and at a steady motorway cruise at 70ish? 2012 TDV8 Vogue (L322)

Following this with interest. I regularly get the amber warning. And a quick short m/way blast clears it for approx couple of hundred miles - I’ve started logging it to get accurate numbers. I’ve also started extending some regular journeys to include the short m/way trip.

jtq4u wrote:

If dpf has a meeting with a hammer and welder it would be interesting ti see if it is smokey when unfiltered!

The egr and dpf would get mapped out at the same time

JayGee wrote:

What's your mpg in town and at a steady motorway cruise at 70ish?

That's pretty normal and nothing to suggest excessive fueling. 2012 TDV8 Vogue (L322)

Interesting post James and you're dead right, every time we change to a newer model it's a big learning curve.
I'm watching my regens like a hawk using the kos kit and although it's all working reasonably well at the minute I wonder if/when it does get full of Ash it might be worth having the DPF cut out and cleaned. Presumably it will be replaced using clamps so it will be relatively easy to clean or replace in future.
Thanks for all the info.
Pete