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Fun With DPF's
Hi did think I had posted these before so I may be contravening something,
Sorry if the images don't load properly into the body. and disclaimer is that this is what I believe to be the case. Bit lengthy for a first post but I hunted around to try and find something properly official without success so hopefully you may find it interesting or useful.Honda’s position on how the stage 1 DPF purge works on their diesel cars is officially: - Well sort of official I did ask for clarity and received the following reply “I have had the opportunity to thoroughly investigate your concerns further and have now spoken with ####### at great length to understand this matter. The service team there have confirmed that having had the opportunity to inspect your product they have been unable to diagnose or find a manufacturing defect with the DPF warning light and have advised you that whether the light will come on depends on the driving style.” And this is how it was explained to me at said dealer The car monitors the journey you are taking and if you have been driving for the correct amount of time at a suitable consistent speed, along with such things as temperature engine and probably outside temperature etc. Plus it thinks the DPF needs a purge. Then the indicator lights up to tell you it’s about to enter into DPF cleaning mode. It is generally accepted that a DPF purge needs to happen in one operation so as far as I am aware you cannot do three quarters, then go out and do the last quarter at another opportunity, so in the unfortunate event that you was approaching your journeys end or some body makes you slow down and drop out of the purging process or similar, the entire process will need to be done again, however you are at least in a position where you are now aware your DPF filter needs purging. So I reckon you need as soon as possible to retrace your journey and fingers crossed your Hondas computer will try again (yes that one that thinks British summer time started at Christmas!). I would recommend doing the second journey at a time when the motorway is quieter, I believe that motorways are generally where the car is happy to do a DPF purge as it is most likely to satisfy Hondas recommended use ie “ Please be advised that the Diesel Particulate Filter is an exhaust component which is heavily affected by wear and tear, driving style, external influences, etc. Driving in heavy traffic – regular short commute, less than 20 miles each way; annual mileage less than 10,000 miles a year; driving at slower speeds for prolonged periods – average speed under 30 mph are a few of the reasons that may lead to a replacement of the DPF filter being required.” If you are successful you could probably have a celebratory Swedish Meatball at an Ikea that you don’t normally get as far as. Unfortunatley you will not be able to follow some motoring organisations advice ie the A.A. advise https://www.theaa.com/driving-advice...culate-filters Don’t ignore a warning light If you get a warning light showing that the filter’s blocked, it should be possible to complete an active regeneration cycle and clear the warning light by driving for 10 minutes or so at speeds over 40mph. (Similar to my handbooks 15 minutes and 37mph) If you ignore a DPF warning light and keep driving in a relatively slow, stop/start pattern, soot will build up in the filter until your car goes into ‘restricted performance mode’ to prevent damage. If you let it get this bad:
You cannot do this because it appears the following function:- https://cimg7.ibsrv.net/gimg/hondafo...0783b7aa0c.jpg As been apparently removed from your car’s computer. However I am open to hear from anyone who may have had the light come on in the way the handbook describes, and how they went on, as the main reason for posting this is because there is very little out there in the way of information. Even if we get some feedback of experiences with the light coming on we may be able get an idea of what we can do to trigger a purge without resorting to bothering the dealers. Hopefully this at least clarifies what’s happening with your DPF light. I asked Honda's advice on how I could operate my car to avoid upsetting the DPF as I ahve not found anything really on the net but as far as |I can gather:- Please be aware that Honda’s position on their diesel cars is officially:- “Please be advised that the Diesel Particulate Filter is an exhaust component which is heavily affected by wear and tear, driving style, external influences, etc. Driving in heavy traffic – regular short commute, less than 20 miles each way; annual mileage less than 10,000 miles a year; driving at slower speeds for prolonged periods – average speed under 30 mph are a few of the reasons that may lead to a replacement of the DPF filter being required.” Basically if you are doing less than 10,000 miles a year, and your journey is over 20 miles and can be completed at average speeds above 30mph. expect to have issues with your DPF filter. To put this in context Government figures for 2021 https://www.gov.uk/government/statis...-to-march-2021 On the Strategic Road Network (SRN) for the year ending March 2021, the average delay is estimated to be 5.9 seconds per vehicle per mile compared to speed limits travel times, a 36.6% decrease compared to the year ending March 2020. The average speed is estimated to be 62.6mph, 6.3% up on the year ending March 2020. On local ‘A’ roads for the year ending March 2021, the average delay is estimated to be 32.0 seconds per vehicle per mile compared to free flow travel times. This is a decrease of 26.8% on March 2020. The average speed is estimated to be 27.8 mph. This is an increase of 9.9% relative to the year ending March 2020. Could not find goverment figures but car insurances appear to work on for 2021 https://www.nimblefins.co.uk/cheap-c...car-mileage-uk Average Car Mileage UKIn 2020, the average car in the UK drove 6,800 miles—down 8% from 2019 and down 26% from 9,200 miles in 2002. British motorists drive less now, primarily driven by a drop in business driving and private driving. Clearly the drop from 2019 to 2020 reflects the impact of the pandemic lockdown.Commuting mileage had held steady at 2,700 miles a year on average per car from 2002 to 2019, but dropped to 2,400 miles a year in 2020. From 2002 to 2020, business mileage plummeted 85% from 1,300 to 200 miles per year. Private mileage only dropped 7% from 2019 to 2020. This means commuting and business miles were impacted the most by the pandemic lockdown; private miles less so. Change in UK Driving Habits Business Miles Commuting Miles Other Private Miles Average Total Miles 2002 1,300 2,700 5,100 9,200 2019 400 2,700 4,400 7,400 2020 200 2,400 4,100 6,800 The average car journey for these cars is 8.4 miles long. [img]file:///C:/Users/KELVIN~1.KEY/AppData/Local/Temp/msohtmlclip1/01/clip_image002.jpg[/img] UK motorists are driving less, especially for business During a time when cars are being driven less and less, it's interesting to note that the number of cars licensed in the UK has continued to rise steadily—so while the mileage per car has dropped, you could argue that as a country we are driving more. Average Mileage per Day, Week, Month and Year How much do we drive per day, week or month? On a daily basis, cars in the UK drive an average of 20 miles a day, 142 miles a week, 617 miles a month and 7,400 miles a year. Average Car Mileage per Day, Week, Month and Year 2019 2020 Per Day 20 19 Per Week 142 131 Per Month 617 567 Average Total Miles per car 7,600 6,800 I am afraid that it does mean we are on our own, for being so short sighted. It is worrying but you could assume that the all new HR-V Hybrid will be similarly slighted if and when any car that contains an engine is prevented from going into cities, and Honda will probably tell the hybrid owners they should have bought the non-existent full electric version. Like I was told I should have bought the non-existent petrol type S version of my car Sorry for the format messing up but the full graphs etc are on the Nimblefins site Regards Kel |
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