 | Home > Puma (Tdci) > DPF Regen - How Often ? |
 
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| Joe the Plumber Member Since: 18 Dec 2013 Location: Midlands Posts: 907  
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I occasionally notice a smell I can only describe as burning plastic when I stop and get out after a journey (and after six years, I'm sure is isn't burning plastic!) I wonder if that's the DPF doing its stuff?
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21st Feb 2020 9:10am |
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| ChrisCSL Member Since: 10 Aug 2019 Location: Berks Posts: 186  
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Regarding the engine note sound when the regen is happening. I assume it’s the sound the engine makes like you are listening to it from a long distance. The tone goes in and out. Weird sound.
I do understand that not everyone would notice it though. Chris |
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21st Feb 2020 9:28am |
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| Balvaig Member Since: 19 Feb 2016 Location: Fife Posts: 730  
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Only ever noticed regen the first time it happened, due to a strong smell of burning. Most worrying at the time.
The following is an extract from the WSM: Passive Regeneration Passive regeneration requires no special engine management intervention and occurs during normal engine operation. The passive regeneration involves a slow conversion of the particulate matter deposited in the DPF into carbon dioxide. This process is active when the DPF temperature reaches 250°C (482°F) and is a continuous process when the vehicle is being driven at higher engine loads and speeds. During passive regeneration, only a portion of the particulate matter is converted into carbon dioxide. This is due to the chemical reaction process which is only effective within the normal operating temperature range of 250°C to 500°C (482°F to 932°F). Above this temperature range the conversion efficiency of the particulates into carbon dioxide increases as the DPF temperature is raised. These temperatures can only be achieved using the active regeneration process. Active Regeneration Active regeneration starts when the particulate loading of the DPF reaches a threshold as monitored or determined by the DPF control software. The threshold calculation is based on driving style, distance travelled and back pressure signals from the differential pressure sensor. Active regeneration generally occurs every 250 miles (400 km) although this is dependant on how the vehicle is driven. For example, if the vehicle is driven at low loads in urban traffic regularly, active regeneration will occur more often. This is due to the rapid build-up of particulates in the DPF than if the vehicle is driven at high speeds when passive regeneration will have occurred. The DPF software incorporates a mileage trigger which is used as back-up for active regeneration. If active regeneration has not been initiated by a back pressure signal from the differential pressure sensor, regeneration is requested based on distance travelled. Hope this explains the process - it seems short journeys means more active regeneration, which are more noticeable . Stephen |
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21st Feb 2020 10:39am |
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| JPE Member Since: 19 Nov 2018 Location: South West England Posts: 334 
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I've read that over time ash builds up in the dpf reducing its effectiveness & reducing the intervals between active regenerations (increasing fuel consumption, oil dilution, etc). Also that pressure drop across the dpf (used to estimate soot level) is not indicative of ash levels. At 82k miles I'm presuming I must have some level of ash which is reducing the effectiveness of my dpf, but perhaps not enough to do anything about it just yet.
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21st Feb 2020 4:02pm |
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| Balvaig Member Since: 19 Feb 2016 Location: Fife Posts: 730
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From my reading of the WSM, passive regeneration does leave particulate matter in the filter.
This is removed by an active regeneration. However, if you are not getting the engine to normal operating temperatures and running for the 20 minutes active regeneration takes, then there will be a build up in the filter. This should light the DPF Full warning on the instrument cluster. I tend not to do short journeys and use mainly A roads. I therefore occasionally do a 20 minute+ run on the motorway in the hope that this prevents problems. |
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21st Feb 2020 7:17pm |
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| keith Member Since: 15 Aug 2012 Location: Edinburgh Posts: 2212
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Regen is around every 400 miles for me and has been since new in 12MY. Burning hot 900 degs, I can smell it and the car goes like a rocket for about 5 minutes.
100,000 miles on the clock and wondering when the DPF will decide to call it a day and gimmi another costly defender bill. Ach’ well what’s new 
Keith |
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21st Feb 2020 8:06pm |
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| Oldyellar Member Since: 04 Sep 2015 Location: Central Posts: 384 
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Better gutted out then totally mapped out of the ECU. No issues no worries. I've got two 2.2 transits done they rev alot more freely . Both Passed mot time after time with this done. It should not be found if done properly. Both Van's are well serviced and are putting out emissions far below the stated values they should be putting out
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21st Feb 2020 8:09pm |
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| JPE Member Since: 19 Nov 2018 Location: South West England Posts: 334
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Regeneration (passive, active or forced) will burn off soot, but can't burn off ash. Ash builds up over time reducing the mileage between active regenerations. To clean out ash needs some chemicals squirted into the dpf and there's various companies specialising in dpf cleaning. Thank you for all the responses, it's been really interesting to see what sort of active regeneration intervals everyone is experiencing. I have to say I am jealous of the 300 & 400 mile figures!
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22nd Feb 2020 9:52am |
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| Howard Member Since: 06 Nov 2012 Location: Oxfordshire Posts: 42 
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I also find occasionally I can smell burning plastic . I think it is the heat from the DPf following a regen. |
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11th Jan 2024 8:24pm |
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| Iktank Member Since: 08 Nov 2014 Location: Porthcawl Posts: 237  
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I have never noticed regen on mine
Do mainly 165miles non stop runs on motorway sticking speed limits or occasional foot to floor. (330 miles round trip) Had BAS map early dayswith the EGR shut down electrinically. |
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13th Jan 2024 10:52am |
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| hornet Member Since: 04 Jan 2010 Location: Western Europe Posts: 361 |
In Germany, the functionality and integrity of particulate filters is tested by measuring particles. Any defective, deactivated etc. particle filter ensures that the test is not passed.
What is it like in great britain? |
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19th Jan 2024 4:56pm |
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| Daphne Member Since: 22 Nov 2023 Location: Kent Posts: 25 
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My 2.2 Dpf was full at 107000 miles I removed it and had it cleaned out professionally.
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19th Jan 2024 10:15pm |
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