Hello

unfortunately one more question regarding soot accumulation:

I found out with IID tool that there is almost NO soot accumulation
when operating water temperature is still < 100%
and even short after very low soot accumulation (picture 1).

I always assumed a cold engine is bad......

13 km (8 miles) city traffic / 25 minutes: 0,3 g soot increase -- very good --



direct retour - same distance- very warm engine
I could see whenver I accelerate soot accumulation goes up: 2,5 g -- not very good --
and only smoothest/slightest/most careful acceleration. (picture 2).
by the way. that was only on my way back with warm engine - no problem on the first 8 miles.

same driver - same route - same driving style - same traffic conditions










What would you look for?

- I have already done a smoke test ( a small leak was found and fixed in the last weeks)
- difference pressure sensor is new
- maybe full particulate filter? will have it externally cleaned I think
- because soot increases when I accelerate: something with the throttle?



let's have a nice new week then...



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Last edited by flashgordon on 27th Jan 2020 3:06pm. Edited 1 time in total

how many miles 'regeneration range' ?
From low grams to 20 or 23grams?
or in other words from regeneration to next regeneration?

also you might need to do a high pressure smoke test.
low pressure smoke test does not seem to find all the leaks.

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

It depends:

- COLD engine ( +/- 8 miles, even city-traffic, even a lot accelerations) = no soot increase = very long distance

- WARM engine + ACCELERATION = problem, max. 50 miles between regenerations
(soot increases only when I accelerate , no matter how smooth I accelerate)

- WARM engine + CONTINIOUS driving = OK, 150 miles between regenerations



.

ok I see - and when you get 150 miles (thanks for working in miles!) what kind of driving is it?

Don't think it matters too much, I think you may have an air leak.

Could be anywhere in this pretty complicated system:

thanks Greg for the picture once more.

Yes, you are right: I had a similar post before ("soot increase within minutes")
https://www.fullfatrr.com/forum/topic53751.html
That problem has been fixed (2 leaks lead to dramatic soot increase and a "red" within minutes).

You may still have an (another) air leak flash.

High pressure smoke test may be needed

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

and did you get the turbo drain modification done?

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

You may still have an (another) air leak flash.
High pressure smoke test may be needed

---> YES, will do that as soon I find time


And did you get the turbo drain modification done?

---> YES, is done.
I am very happy with it.
my impression is, I feel the extra-power from the 2nd Turbo 100-200 RPM earlier than before
and it feels a little smoother than the Turbo-punch before....


.

I hope I solved the soot/DPF issue:


I finally changed the gasket between throttle and manifold because there was a little soot blown out,
part number is LR022931 only 2,-- GBP





For this I had to remove the throttle - and it was obvious a liitle oily/sooty - one side more than the other