Confirms earlier advice that it's filling up way too fast / often.
My London 20mph of sat in traffic kind of driving sees me having to do a regen roughly per tank of diesel .
Town driving - that's once every 300 miles.
Mine's had the EGR sensor fixed not that it makes any difference.

. Cheers, Greg
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2011 Vogue SE 4.4 with lots of toys in Stornaway

Good evening gents,
Sorry late to comment, only just got home having been out all day.
Mine did a regen on Sunday down to 6.4g.
Monday only 30 miles local.
Tuesday 15 - 20. Miles local
Wednesday zero miles
Today, 130 miles. ( 90 on motorway) other mixed local stop - start .
I didn’t actually monitor it during day but just checked it and soot level 12.5g.
Like Greg, I reckon 1 Active regen per 3- 400 miles or 3/4 tank full.
Sorry Matt but yours is filling up way too fast.
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

Matt,
Just a thought, you say they did a smoke test, but , has it got the modified 4 short plenum hoses, or the original very soft rubber type ?
They are notorious for splitting near the jubilee clips and will cause rapid soot build up like you are experiencing, eventually causing car to trip into restricted performance.
You need to get it sorted soon, because your engine oil will be getting contaminated.
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

That is the recommended way to check for any air leaks on the inlets, but ?.
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

Matt,
Ask them to print you off a copy ofTechnical Bulletin number LTB00523v2, dated 6th June, 2013.

It covers hose problem, and is worth a read.

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

Which Indy? AL Services? Bournemouth LR? Douglass ? Evans Garage? R&E?
Looking forward to seeing what LR Christchurch come up with  Gone to a good home: 2011 4.4 TDV8 Vogue SE Buckingham Blue with Ivory and clear glass = "Rory"
2025MY Defender D350 90 in Silicon Silver on coils
1974 Series 3 Lightweight = "Millie"
Many, many other Landies over the years
My preferred specialist: www.glenrands.co.uk
--------------------------------------------------

Fair enough Matt, you seem to be getting good service from the dealer and hope we all learn from your experience.
I only suggested the plenum hoses as worth checking because they were by far the most common failure when I compiled. my 4.4 tdV8 Fault Log Post. and I know that their failure causes rapid soot build up.
Mike.

https://www.fullfatrr.com/forum/topic44115.html 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

Be good to see what their diagnosis will be. Greg mentioned potential throttle body issue - did LR Christchurch say that was an area to investigate?
Keep us posted  Gone to a good home: 2011 4.4 TDV8 Vogue SE Buckingham Blue with Ivory and clear glass = "Rory"
2025MY Defender D350 90 in Silicon Silver on coils
1974 Series 3 Lightweight = "Millie"
Many, many other Landies over the years
My preferred specialist: www.glenrands.co.uk
--------------------------------------------------

Cracks in the Plenum chamber are common because the weld on the seam has failed, but again ,this would have shown up on the smoke test.
Unless it has had several trips onto the mainland I bet the 2nd turbo has hardly been called into use.
I am sure they will sort it .
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

Matt,
Firstly you are to be congratulated on the amount of useful live data you have captured.
I don’t know how you have collected it all.
I rely on my wife taking screenshots on my iPad when regens are taking place whilst I am driving., but usually only manage one or two shots per trip.
Have you found an easier method.?
Secondly make sure they change the oil and filter as soon as they find the problem.
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

Thought I'd show a regen happening at low speed / low revs:




- regen demanded because grams are over 17.5
- ECU is happy with the following
- plenty of fuel
- constant speed for a period of time
- engine temps are normal*

then it'll regen even at 39mph

Steady speed is everything: as my grams fell below 10, the speed limit increased so seeing the burn in progress I eased up the cruise speed really slowly but it upset the ECU and the burn stopped. Leaving me at 8 grams.

*temp shown on screenshot is gearbox, unrelated



. Cheers, Greg
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2011 Vogue SE 4.4 with lots of toys in Stornaway

Last edited by GGDR on 23rd Jun 2019 8:26pm. Edited 1 time in total

As I understand, it measures exhaust pipe pressure before and after the DPF and from this calculates flow rate.
That value comes in volts, not sure why. Then, using the following black magic it calculates the grams:

Quote:

I found this when searched one of your label titles "inferred using differential pressure"

In order to estimate the diesel particulate filter (DPF) soot load and improve the accuracy of regeneration timing, a novel method based on an equivalent circuit model is proposed based on the electric-fluid analogy. This proposed method can reduce the impact of the engine transient operation on the soot load, accurately calculate the flow resistance, and improve the estimation accuracy of the soot load. Firstly, the least square method is used to identify the flow resistance based on the World Harmonized Transient Cycle (WHTC) test data, and the relationship between flow resistance, exhaust temperature and soot load is established. Secondly, the online estimation of the soot load is achieved by using the dual extended Kalman filter (DEKF). The results show that this method has good convergence and robustness with the maximal absolute error of 0.2 g/L at regeneration timing, which can meet engineering requirements. Additionally, this method can estimate the soot load under engine transient operating conditions and avoids a large number of experimental tests, extensive calibration and the analysis of complex chemical reactions required in traditional methods.

Matt, not wanting to get involved but certainly curious

- doesn't your Terraclean complicate the custody chain / handling of the issue?

Did you buy t from the LR dealer you are taking it to?

(Also FYI there is a bit of skeptism about Terracleaning.)

. Cheers, Greg
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2011 Vogue SE 4.4 with lots of toys in Stornaway

Fair enough!

I know my intake will be clogged but I just don't fancy any chunks going through the turbos.

As for differential voltage, I've no idea. A quick scan through the workshop manual finds this:

The Particulate Filter Differential Pressure Sensor measured voltage with the ignition on checks the sensor output with no variation/pressure in the exhaust system, checking the Particulate Filter Differential Pressure Sensor adaption is working. The measured voltages at engine idle and 4000 RPM will be considerably different depending on the diesel particulate filter soot loading. The idle value tells us that the Particulate Filter Differential Pressure Sensor is working if it goes up from the ignition on value. The 4000 RPM value tells us how much soot is in the diesel particulate filter. A diesel particulate filter which is recoverable measures less than 1 Volt at 4000 RPM

Doesn't quite answer your question. But confirms 1volt is high. I don't normally see this, it's normally .7 .8 or .9

. Cheers, Greg
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2011 Vogue SE 4.4 with lots of toys in Stornaway

Component description of the differential sensor from the WM:

As the amount of particulate trapped by the DPF increases, the pressure at the inlet side of the DPF increases in comparison to the DPF outlet. The DPF software uses this comparison, in conjunction with other data, to calculate the accumulated amount of trapped particulate.

By measuring the pressure difference between the DPF inlet and outlet and the DPF temperature, the DPF software can determine if the DPF is becoming blocked and requires regeneration.

Pretty broad / simplistic description. I can't find anything else on values. Cheers, Greg
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2011 Vogue SE 4.4 with lots of toys in Stornaway