 | Home > Technical > Puma 2.2 DPF query |
 
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| Puma_MOG Member Since: 08 Sep 2017 Location: Cheshire Posts: 184   
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Thank you for that. I can now see it in demo mode. Keen to see this tomorrow
Thanks again, P |
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21st Sep 2024 8:18pm |
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| Puma_MOG Member Since: 08 Sep 2017 Location: Cheshire Posts: 184
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So, I scanned the 90 and my DPF was sitting at 95% full. I jumped in and went for a 10 mile drive which was mostly on a dual carriage way A road with 3 roundabouts each way. Literally 5 mins in the DPF capacity % started going down and by the time I was almost home it levelled off to 15%.
Today I decided to go fill up and went the long route via mostly A roads again but this time mostly single lane and very much a relaxed drive, approx 12 miles. By now it was showing DPF being 25% full. Filled up, Shell V, and jumped on the motorway but only to see it going up! I drove it a tad harder than I normally do and still nothing. Engine temp stayed at 90 and only crept to 92 for a sec or two. Got home and now sitting at 30%. Checked cat temps, CarScanner showed two, and these were at approx 170c. I would have assumed some sort of Passive Regen would have taken place or is this only when it gets to a certain %? Not sure if this is related but upon shutting off the engine, I got a wee bit of it running on/sputter. Gave it a few secs, fired it up, let it idle, off and again the sputter. All very odd. |
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24th Sep 2024 7:16pm |
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| Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3419  
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Not and expert in DPF, or their regeneration, but I wonder if you have a problem with the pressure differential sensor. I cannot see how a DPF can regenerate and clean itself so fast. But as said, I am not an expert. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black |
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25th Sep 2024 5:10am |
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| andy63 Member Since: 30 Jun 2023 Location: north east Posts: 530
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Not sure either how long it takes but I'd suspect a demanded regeneration by the ecu would last around 20 min..
The only sure way of knowing it's happening is to monitor your exhaust gases temperature..I think you could expect it to reach the 600 deg C mark . If your dpf is full you should have dash warnings and or codes.. |
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25th Sep 2024 10:10am |
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| Puma_MOG Member Since: 08 Sep 2017 Location: Cheshire Posts: 184
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Thank you both.
I was just confused as I expected a passive regen to have take place what with being on the motorway and not view the % level go up. I shall try and add the exhaust gas temp to the dashboard of the scanner and do another motorway trip to see what's what. Thankfully, at least yesterday, the stutter after shutting off the engine didn't happen. |
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26th Sep 2024 6:14am |
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| Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3419
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I have noticed an occasional stutter when switching off the engine, and I have associated that with the DPF regeneration is still underway when switching off the engine - since I installed a straight through mid exhaust, I hear a different exhaust tone during regen. I think the stutter is caused by the throttle body staying open. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black |
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26th Sep 2024 7:25am |
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| andy63 Member Since: 30 Jun 2023 Location: north east Posts: 530
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It's a bit confusing, all the terms used..
I've heard the term passive regeneration used, but in terms of a dpf alone I would ignore it..there is only one thing that will remove the soot in a dpf and that is high temp..that will only be brought on by an active regeneration..that can be instigated by the ecu (automatic ), or a scan type tool.. The term passive to me is more connected with the maintenance of a catalytic converter..where a regeneration if that's what you want to call it is at lower temp and involves the egr (ie Nox or oxides of nitrogen ) or those scr systems using ad blue.... That's sort of my general understanding, and if that's right then the only way to clear a dpf is an active regeneration.. the types of which I mentioned above..1e automatic or scan tool instigated.. |
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26th Sep 2024 8:09am |
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| andy63 Member Since: 30 Jun 2023 Location: north east Posts: 530
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That sounds right because during an active regeneration the throttle body may well be under the control of the regeneration process.. ie it may be closed down slightly..and glow plugs in use etc If you shut down during a regeneration it may well be noticeable |
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26th Sep 2024 8:15am |
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| Puma_MOG Member Since: 08 Sep 2017 Location: Cheshire Posts: 184
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A bit of an update.
The last regen brought the soot level to 15%, per my OBD scanner. That regen lasted less than 15 mins and was at 90% when it kicked in. Since then I've been driving around with car scanner in view and watched the soot level quickly rise to 70% with mostly A/B road driving. This weekend had me on the motorway for approx 3 hrs. I was averaging 70 mph and mostly in 6th gear and watched the soot level creep up to 90%. Cat temps started to rise and shortly after the soot level started to drop but the regen only lasted 10 mins at which point the cat temps dropped and soot level stayed at an indicated 20%. This was within the first hour. By the time I got to my destination I was showing 30%. The rest of the day was spent green laning and the following day had me driving back home, same 3 hr trip, getting home with soot levels at 80% again. I would have assumed another regen would have taken place and/or seeing said regen last longer and get the soot levels much lower. Will it ever read 0%? The dangers of having a scan tool and now obsessing over the readings  |
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24th Oct 2024 2:02pm |
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| DAZ110 Member Since: 06 Dec 2007 Location: East Sussex Posts: 2039 
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Not a Defender but my VW Caravelle never gets to 0%
Best I’ve seen it is about 18% I’ve no idea about my Defender. I’ve never ever noticed it do a regen.  |
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24th Oct 2024 6:10pm |
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| BrunoJ Member Since: 14 Sep 2019 Location: Stavanger Posts: 75  
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With typical city+local road driving, the UG shows around 300C, then 450-500 during DPF cleaning. In that mode, cleaning is triggered every 400-500km (maybe often).
Riding on highway with 120-130km/h makes 400-450C as "normal" temperature. Then 600C+ when cleaning (speed below 110km/h required). Higher temperature of exhaust I see as a passive cleaning. Didn't measure soot level (UG doesn't display it), but after long highway drive when I went slower, the regeneration has not been triggered for next couple of hundred kilometers, which means for me it was not required. I did almost 4000km and only two regenerations observed (EGR closed, higher exhaust temp, a bit different tembr of engine sound). So - my reading of situation is - there is no passive regeneration with regular driving, but that works (due to higher temperatures of exhaust) during longer highway rides. |
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24th Oct 2024 9:23pm |
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| JPE Member Since: 19 Nov 2018 Location: South West England Posts: 335 
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Puma_MOG, I know exactly what you mean by obsessing over the readings!
For the 5 years or so I've had my 2013 SW, it has actively regenerated about every 115 miles. The soot level is normally in the 90-100% range when the regeneration starts, although it occasionally reaches around 115%. It never drops below 14 or 15%. Regens complete I'd say within 20 minutes, so not so different to your observations. I do see some passive regeneration on a good run on a motorway at around 70mph, with the soot load % slowly dropping down, but it never gets very low & if I'm lucky it drops 5 or 6% at most through passive regeneration. Its the active regeneration that clears it out. As well as soot, my understanding is that over time ash builds up in the dpf, which reduces the effectiveness of the dpf. The ash can't be cleared out through a regeneration like soot can. I worry about mine a lot less than I used to. I have toyed with the idea of taking out the dpf for a thorough clean, or changing the differential pressure sensor, or getting the injectors tested, etc, but it drives really well and so for now I'm leaving it be. I'm wondering what mileage you are seeing between active regenerations? |
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24th Oct 2024 9:45pm |
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| Puma_MOG Member Since: 08 Sep 2017 Location: Cheshire Posts: 184
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Thank you all for the replies and input given.
I too don't think a passive regen happens as I was driving 150 miles at 70mph ish, with some of it in 5th to see if the higher load would do anything. I only saw the soot level go up. @JPE, mine seems to regen at roughly the same intervals as you but it depends on if I'm on the motorway or not. My problem is I don't often do longer trips which fuels my growing obsession with keeping an eye on it! |
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25th Oct 2024 5:23am |
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| andy63 Member Since: 30 Jun 2023 Location: north east Posts: 530
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I wouldn't get to hung up on the % soot levels..
You really would need to know what all the criteria were , that are used in determining it.., and whilst the differential pressure sensor is undoubtedly the most important I'm sure there area few others others.. It would be good to compare diff press sensor output with scan tool % soot levels but whatever the % soot level stated i wouldn't be to concerned as long as the differential pressure sensors reading was not high...ie 2 or 3 psi perhaps.. And the other thing to note is you are not getting the orange dpf warning light...so all should be OK , and if you do get it up try and record the soot level % when it's activated and the differential pressure reading at the time.. |
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25th Oct 2024 8:02am |
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