I got a 2011 4.4 TDV8 in poor shape. Spent a wad fixing everything. Items relevant to this post include;

Thermostat and housings
Water pump
All belts and pulleys/tensioner
Full service (whole lot, inc diffs etc)

All genuine LR parts.

It continued in limp following all that work. Got an LR diagnostic done, oil in water.

New oil cooler and coolant tank, system flushed 4x times. Told it a new DPF was fitted, ran a successful forced regen (using a Gucci diagnostic tool but not LR). All going good with no soot inferred by DP.

Since then, the soot has gradually built up to the 23.5g lower threshold and triggered the amber DPF full message.

In the last 30 miles, since the amber DPF triggered, it has logged 17 attempts to regen with none successful, not even partially. Something must be stopping it running the regen but no codes or warnings or faults logged.

I tried a forced dynamic regen using my own iCarsoft LRII tool. It let me go through the motions but got stuck saying 'Waiting for engine to reach temp'. The engine was well warmed up with driving and sat at 89-93 degrees for the continuous drive at 50 plus mph for 25 mins.

Inferred soot currently at 24.7g.

Any suggestions? I'm clueless now.

Engine oil temperature and not coolant temperature may be what it's waiting for which will take longer. Not sure why you told it a new DPF was fitted as this could mess it up. AFAIK soot level is measure by the pressure differential across the DPF so if it thinks the DPF is new it will not require much soot load to assume it's very full. 2012 TDV8 Vogue (L322)

I can only think that you could try and get a HIGH pressure smoke test done because I suspect it will finally prove to be an air leak on the intake somewhere.
The old favourites of 4 short plenum hoses, split in either plastic plenum or inlet manifold, or loose connection on hose to throttle body.

Good luck, and please keep this post updated so we can all learn together.
Cheers
Mike. G reg 2.5VM Vogue Portofino red 1991- 1999
V reg 2.5td P38 Rioja red 1999- 2006
53 reg td6 Vogue Oslo blue 2006- 2015
11 reg 4.4 TdV8 Vogue SE. Baltic blue 2015- date.
https://www.fullfatrr.com/forum/topic56162...tty+affair

One further point, keep an eye on the oil dilution figure, it will soon reach the limit of 7 with all those failed regen attempts.
Mike. G reg 2.5VM Vogue Portofino red 1991- 1999
V reg 2.5td P38 Rioja red 1999- 2006
53 reg td6 Vogue Oslo blue 2006- 2015
11 reg 4.4 TdV8 Vogue SE. Baltic blue 2015- date.
https://www.fullfatrr.com/forum/topic56162...tty+affair

An intake air leak would indeed cause a rapid soot build-up but I can't see how it would prevent normal or forced regenerations. A sticky EGR valve will prevent regeneration if it can't close but this would throw a fault code. 2012 TDV8 Vogue (L322)

Thanks both.

Ref the new DPF, it had reached max soot and ECU was no longer able/willing to run a regen. LR guru suggested telling it the DPF was replaced and running a regen immediately. Both worked with 100% success.

The inlet system has been stripped, checked and rebuilt. One plenum hose was not seating well, before or after. There was a previous air intake leak so it could easily be in that system. Maybe I'll need to get a bigger loan and go for that smoke test.

Good info ref oil dilution. I would never have considered that.

Thanks again, it's nice to know there are real world people willing to chip in on this site/forum.

I think the investigation should be directed at the engine temperature fault the diagnostic is reporting. 2012 TDV8 Vogue (L322)

As Jaygee says.

Mine had exactly your symptoms - over 1,000 attempts to regen in a few hours. I would attempt to regen but not complete. This was due to the engine temp (these 4.4 engines run v cool anyhow) not getting near to where the regen could take place. My specialist LR indie found the thermostat housing had been broken (prob while the LR dealer was replacing the inlet manifold) and was wide open thus reducing the running temp.

Housing replaced and not a whimper for over a year. Car running perfectly.

yours may have a engine temp sensor failure and need replacing?

Hi JayGee,

It's not reporting any faults, just my iCarsoft unit saying waiting for engine to reach temp. This is at the outset, before the actual regen, with the screen saying TEST.

When checking oil and coolant temps, it all looks good and above the minimum required by the regen function.

Do you think it's possible that my unit is just too basic/cheap to action the regen?

Thanks

I know people do forced regens on the GAP IID tool successfully but no idea on the iCarsoft? I've no idea what other temperature inputs are required for regeneration and it may include EGT? 2012 TDV8 Vogue (L322)

https://www.fullfatrr.com/forum/topic60984...+using+iid

I have done several forced regens using my updated Gap iid, as detailed in the above link.
It shows the sort of temperature needed.

Mike. G reg 2.5VM Vogue Portofino red 1991- 1999
V reg 2.5td P38 Rioja red 1999- 2006
53 reg td6 Vogue Oslo blue 2006- 2015
11 reg 4.4 TdV8 Vogue SE. Baltic blue 2015- date.
https://www.fullfatrr.com/forum/topic56162...tty+affair

Just a thought….
You do know that you need a MINIMUM of 1/4 tank full of diesel before the car will Cary out any form of regeneration ???
Mike. G reg 2.5VM Vogue Portofino red 1991- 1999
V reg 2.5td P38 Rioja red 1999- 2006
53 reg td6 Vogue Oslo blue 2006- 2015
11 reg 4.4 TdV8 Vogue SE. Baltic blue 2015- date.
https://www.fullfatrr.com/forum/topic56162...tty+affair

Beat me to it Mike

Baltic Blue wrote:

Just a thought….
You do know that you need a MINIMUM of 1/4 tank full of diesel before the car will Cary out any form of regeneration ???
Mike.

Actually during my monitoring, the normal day to day Active Regeneration, I have recently seen it occur at less than 1/4 tank (in-between red and 1/4) but, I have never seen an Amber on mine, maybe an Amber does need a minimum 1/4 tank as there is a lot more soot to burn off? But then mines a L405 and will have different DPF architecture and algorithm?
But without doubt I never go below half a tank these days, as anything can happen!

I don't think 25mins is enough though, you could be interrupting it every time if you are doing short journeys.

I have also seen normal regens at oil temperatures in the 60's. So more inclined to think an Active Regen is a combination of Engine temp, soot % and engine running time and speed.

Would love to get my hands on a flow chart regarding the algorithm

Passive Regen starts at DPF temps of 250 Celsius which is above 63mph for me, you could plan to do a 1-2 hour 70 mph motorway run that will eat away at your soot% but being on amber it could very soon turn to Red on your way to a motorway.

Maybe someone on this forum lives close to you with a Gap tool, that can force it for you? It can also scan and see your sensors are functioning, oil dilution level etc etc. 2018 SE SDV8 4.4 Byron Blue

Thanks again all, lots to work with. I'm taking it to a garage this evening that has a Gucci tool. It may be that I need to invest in one of these Gap tools for myself.

I'll add comments if/when I make headway.