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Old 05-27-2019, 05:45 AM   #11
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Default Re: Sprinter Gurus ONLY Educate me about Sprinter passive regenerations.

New cat and dpf on a 07 NCV3 I typically see 700F on a fully loaded van Going up a hill 73 F ambient going 65 mph dpf diffental at 35-55. Going down the hill I’ll se the temps drop to 400 F
Very important to see high egr cooler temp sensor reading ? Do you know why ? Because if the egr cooler solenoid doesn’t bypass cooler ..all the extra fuel used for regenerate will
Plug the cooler with soot

Last edited by MobileCC; 05-27-2019 at 05:56 AM.
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Old 05-28-2019, 02:56 AM   #12
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Default Re: Sprinter Gurus ONLY Educate me about Sprinter passive regenerations.

Attaching two documents from Mercedes about the V-6 diesel exhaust after treatment including the DPF.

In the first document a description of the DPF indicates in order to burn off the soot particles, temperatures of over 600 degC are required. It also states that these temperatures are not reached during normal operation of the diesel engine.

The second document describes the function sequence for DPF and the regeneration cycle.

enjoy,
Attached Files
File Type: pdf 02_201300_000_en.pdf (3.19 MB, 27 views)
File Type: pdf Exhaust aftertreatment function USA.pdf (98.3 KB, 28 views)
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Old 05-28-2019, 09:57 AM   #13
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Default Re: Sprinter Gurus ONLY Educate me about Sprinter passive regenerations.

on my 2015, I can watch the DPF soot load estimate using scangauge II

while in general, the value increases while driving, and decreases during DPF regeneration events, it goes up and down, depending on driving conditions. this downward-trend during driving (outside regeneration) is either passive regeneration, or re-ordering of soot within the DPF which allows reduction in differential pressure (which is used in estimation of the DPF soot load)
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Old 05-28-2019, 02:40 PM   #14
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Default Re: Sprinter Gurus ONLY Educate me about Sprinter passive regenerations.

I recall we had this passive regen discussion 7-10 years back.............I think the general consensus was Sprinters don’t passive regen. They might produce less soot at high speed high loads as they run hotter exhaust temps ? I have noticed longer intervals between regen when running fast and loaded.


Here’s short discussion from 2010:
https://sprinter-source.com/forum/sh...e+regen&page=2

Obviously since then we all learned to watch for regen with the scan gauge. Before that many of us never noticed regen activity.
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Old 05-28-2019, 03:04 PM   #15
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Default Re: Sprinter Gurus ONLY Educate me about Sprinter passive regenerations.

Quote:
Originally Posted by Boxster1971 View Post
Attaching two documents from Mercedes about the V-6 diesel exhaust after treatment including the DPF.

In the first document a description of the DPF indicates in order to burn off the soot particles, temperatures of over 600 degC are required. It also states that these temperatures are not reached during normal operation of the diesel engine.

The second document describes the function sequence for DPF and the regeneration cycle.

enjoy,
Interpretation of the temperature required to burn off, - meaning restore to clean. .. a crossover regenerate sweet spot is required. .. Doesn't spite the fact that cleaning oxidation starts earlier.

Last edited by CJPJ; 05-28-2019 at 03:21 PM.
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Old 05-28-2019, 03:42 PM   #16
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Default Re: Sprinter Gurus ONLY Educate me about Sprinter passive regenerations.

Quote:
Originally Posted by mikeme View Post
on my 2015, I can watch the DPF soot load estimate using scangauge II

while in general, the value increases while driving, and decreases during DPF regeneration events, it goes up and down, depending on driving conditions. this downward-trend during driving (outside regeneration) is either passive regeneration, or re-ordering of soot within the DPF which allows reduction in differential pressure (which is used in estimation of the DPF soot load)
Good info. Is the DPF soot load estimate a standard parameter on a ScanGauge II? Or did you have to program it in?

The Mercedes documents I posted indicate 99% soot burn during fuel induced regeneration. Your observation would indicate some level of passive soot burning, but not enough to keep up with eventual soot load.

That info helps explain the varying mileage I've observed between regenerations when exhaust temp rises above 1200 degF.
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Old 05-28-2019, 08:32 PM   #17
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Default Re: Sprinter Gurus ONLY Educate me about Sprinter passive regenerations.

DPF parameters are a custom X gauge the user can program into a scangauge.

recently the engineer at scangauge developed and posted a bunch of them.

https://www.scangauge.com/x-gauge-co...w-3-0l-diesel/

and

https://www.scangauge.com/x-gauge-co...r-2-1l-diesel/

PFL is the gauge I am referring to.

The transmission fluid temp is also a handy one to have.
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Last edited by mikeme; 05-28-2019 at 10:08 PM.
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Old 06-06-2019, 03:31 PM   #18
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Default Re: Sprinter Gurus ONLY Educate me about Sprinter passive regenerations.

Thank you for the education. If the 572 degree regeneration temp value is correct, it appears Sprinters can passively regenerate occasionally.

I noticed DPF temps occasionally reach 572 degrees and a little beyond needed. However, the majority of the time, temps are well below 572.

Last edited by Bobnoxious; 06-06-2019 at 03:36 PM.
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