DPF problems: How diesel particle filters actually regenerate | Auto Expert John Cadogan
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- Опубликовано: 2 мар 2020
- Diesel particle filters give owners of diesel vehicles lots of problems - often expensive, time-consuming and inconvenient ones. There's a lot of misinformation about how they work and - in particular - how they regenerate. This report is an attempt to clear that up. (Plus, there are some nuts from the comments that deserve evisceration, at the end of the report.)
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DPF regeneration is triggered in a vehicle only when I'm behind it in heavy traffic.
Murphy's law
Best straight talking explanation of DPF I have seen or heard. Thanks John!
Love how you always seem to manage to place an ontological argument in your feeds - cracks me up. Keep up the great work. PS will keep in mind the DPF advice.
Your confidence in R&D engineers on ECU programming is admirable. Just ask American eco-diesel owners about the engine tune. -- Will
Although I am from Brexitania and our car models differ, your videos make me smile. And the technical content is just as relevant.
I dare not get another diesel however as we might find them banned at any minute.
Need a MELS hat for England.
20 years ago England was so Awesome. Only real migrants were Indians running corner shops, chippies and little hotels. West Indians on the buses but safe as houses just awesome. Bloody EU wrecked it. Not too much PC back then.
Hi John, you pep me up when I watch your videos. Keep it up mate.
Here in the UK most Transits sit around 80mph. Locked on to your rear bumper at a distance of around 8ft in the process. 5 week old copies of The Star folded up on the dash at the front window. McDonald's wrappers dancing on the dash next to it.
As it passes you'll usually see the back end has, written in the dirt, "I wish my wife was this dirty" or words like that.
😂😂
John. From my own experience with city driving I found that each attempted re-gen, where the car ups the fuel, it let a small amount of diesel fuel past the bores and into engine oil. If the car is turned off during a active re-gen it tries again a few days later and this could happen several times until its completed one. Over a year if enough re-gens are actioned it causes the oil level to creep up. As dpf engines use low ash oil, to restrict exhaust contaminents, the diesel fuel alters the oil qualities and actually speeds up the dpf blocking as well as losing some lube qualities. My mechanic advised me to change oil twice yearly to protect engine, turbo and dpf. I drive about 8000 miles a year mostly city.
Yeah - exactly, and that's why highway drives are good (it evaporates some of the contaminant fuel out of the oil). Doubling the number of oil changes (twice the frequency) is an obvious hedge against this.
Some vehicles have an extra diesel injector in the exhaust system before the dpf to do a “burn” rather than modifying the injector timing.
this is a bad thing. john has some earlier videos that cover it. very expensive recurring and unnecessary problems come of it. to me it feels like the Toyota engineering department got told to “make DPF happen - now and cheaply”! and, well, they delivered.
In my 70,000 miles on a VAG DPF system all I can say is that good servicing is vital. The only time I had trouble was when my timing slipped between service intervals causing excess smoke at low RPM and lots of regen cycles. Once that was fixed it was fairly trouble free. The problem was of course tracing the fault. Pre-DPF days the plume of black smoke out the back would have been a clue something was up. But the DPF was trapping all that crap and all I had to go on was frequent regens.
How many klms do you do in between services
I’ve been running a 2018 isuzu mux for around 10 months now. The dpf regen has been flawless. It’s positioned in the engine bay so it won’t light grass on fire and seems to have no trouble getting up to temp. i’ve had it kick off an active regen after 5mins of driving in the suburbs. it will also happily complete a regen sitting at the lights or parked. if i notice it’s in regen mode i usually drive around and give it time to cool. however, if ignored it seems to look after itself in the background. some very nice engineering :)
That's typical Isuzu, they know how to build a long lasting and efficient CRD. My Mitsubishi diesel is similar, both have truck engineers involved in the engineering. Toyota just doesn't know how to build a CRD and if anyone tries to tell you that a Toyota diesel is better than an Isuzu or a Mitsubishi for that matter is pulling your proverbial leg. I've had a 2013 Toyota diesel suffer run away and eventually siezing up solid, they're got no idea.
I have a 2017 Dmax that’s done 136,000km and now it can’t be driven until the 13th April where it’s being towed to a diesel specialist for diagnosis as the DPF has failed. Car in limp mode and been instructed not to drive it at all costs. Last year paid $10,000 to fix the cracked inner guards after Isuzu wouldn’t pay under warranty. Waiting for approximately 40 weeks for VCAT hearing. Look into how many turbos fail on the mux/Dmax too. I’ll never get the Isuzu die hards. I’ve had 20 year old cars that are far more reliable.
You keep saying “make Australia less shit” then everyone goes out an buys all the toilet paper. Coincidence? I think not.
LOL
As a truck driver im curious to know if these dpf filters and what they let out is safe for people to be breathing in.
I often get caught up behind trucks burning off the excess waste from their filters even when sitting at lights.
I cant help but think none of these particles are safe so why are they even on diesel vehicles?
Most likely more harmful than original emissions IMO
Depending on the car. Some cars only requires driving at relatively low speed at over certain time period, to active the burning process.
My 2010 Mondeo has a pretty good regeneration program. It'll do it once every 1000km or so, it can begin and continue at idle and will be able to complete an active regen in a fairly short 7km drive (that includes 2km ish on the highway at 100km/h). Works pretty well and unobtrusively, fifth injector used in the exhaust so the oil isn't fouled by excess diesel.
My dude, have the vaporiser cleaned every 50k. DPF cleaned every 100k professionally. Use only C4 oil, too. Don't listen to the numbnuts at Ford who have you using the incorrect oil for such an emissions equipped vehicle. In Europe they'd make you use C1 oil. C4 is low ash (metals) and high HTHS (more protection). C1 is low ash and low HTHS (less ash is to keep the dpf from being clogged, Low HTHS means more fuel efficiency and less pollution, naturally). Peace
I have a 2017 HiAce, which does have a button for regeneration. Also, it seems to do regeneration automatically when idle at traffic lights. I've never had to worry about it with a normal amount of urban driving.
Brilliant breakdown,thank you
"Hit me up on the website... for that" - I come here mainly for this quote, love it :-) Cheers from Poland!
Thanks for saying you don"t want to be the Prime Minster, You are so more required keeping the Auto info truthful.
I'd also be minister for cars and driving.
John you keep making them and I will remain entertained, we are of the same vintage, hope were not in the same old aged home together I might just have to use the pillow on you, cheers, Mate.
@@cbromley562 I've pretty much already done that on the channel. EVs are a nice idea, but economically irrational and impractical on many levels.
This bloke should definitely start wearing a fedora.
Hey John, I have recently seen several cases of utes (mostly Toyota) and others belching out clouds of white vapour which stinks of unburnt diesel if I dont close the vents quickly enough. Is this a sign of DPF problems?
Ok - just found this channel because my wife’s Audi just said it needs regeneration in this damn filter. You’re funny, man. I’m subbing to learn more but subbing to get some comic relief.
Very helpful . Thanks john
Please do a beer garden physics/chemistry session on what actually happens in a DPF. What goes in, the chemical reaction and then what comes out. What is the particle size and it's effect on the respiratory system of mammals. Thank you in anticipation.
Thats readily available and vastly variable information... its also fuel and engine specific. The dpf emission from your 80 litres a week is nothing in comparison to the 100+ ltrs an hour the big ships drink. And think how many huge boats come from cheap unregulated countries? Not like the environment matters to them if they can make an extra dollar or save 2c. Also nasty cheap diesel leaves alot more junk behind.
SIIIOXIDE that's a fair point but think how many cars can that ship carry at one time? If every potential car onboard had to burn fuel to travel the same distance, what would the total be?
Hello, thanks for the video. I have Fiat Bravo 2008 1.6 multijet diesel. The car keeps regenerating way too often even after EGR repair and unstable idle repair (which was from the Throttle body electronics). When I scan the DPF I can see that sometimes it is about 31-38% but also very often there is a log which always states 64% and 107k km exactly. Can it be a fault in some DPF sensor or something stuck in the software? The car has power and good fuel consumption. Thanks!
Driving one of our work cars last night the DPF light was illuminated. After 10 minutes of driving I hit a speed bump and the light went off straight away. New industry secret? Or just good old Paj quality?
mate I think you would be a great prime mincer . keep up the good work.
Can you imagine Prime Mincer JC on the TV with "no more Centrelink and negatively geared investment property tax relief for the boguns, hit me up on the website for that!"
Love dunning Kruger effect remark
This shit is so fundamental, I don't even know why I watch it... oh wait a moment...you fucking crack me up with your hilarious delivery! Keep up the great work John, you are truly one of a kind!
Hello. How much time needs the regenetation on the highway? I need more than 15minutes to roll on 80-120km/h ?
Hi John, I just got some bad news from the testing station because my 2014 VW Golf 4 motion failed the emisssions test. Apparently the DPF is letting about 10 times too much soot through and is causing the deaths of hundreds of innocent people. Anyway, the quotes for a removal and replacement top out at around 4500 Swiss Franks (I'm obviously living in Switzerland) and the car is worth about 6000 at the most. According to the mechanic, the book tells him the rep needs 7 hours to do. I just don't understand the car manufacturers creating such an expensive situation in what really is a thing that eventually wears out or should be relatively easy to replace or cheaper to buy. It means the car will be be written off and sent to Africa where it will rund for the next 20 years puffing excess soot into the atmosphere, but the Swiss concience is clear.
Thanks for answering the MALS question. Mal the ML63 owner
Overall a very good description of how DPFs SHOULD work.
Sadly quite a lot of manufacturers have set their programmers to actually make the Filter suffer more when using a Diesel the way its supposed to be used (long time cruising below 200rpm). FOr example,, my ex Car, a Mazda 6, actually had a "how to" that required: To be driving above 40 and below 80 miles an hour, in at least gear 4, and with more than 2000rpm but low load to trigger. And it shut down as soon as one left that area even for 2 seconds.
Needless to say, the filter filled up a lot.
On another example, my Brothers Giulietta 2.0 Diesel actually worked very well with the "normal usage" for Diesels until it reached around 110000km, then the Filter went from OK to full within about 1 Month....
Ah yes, the pleasure of having to use a semi-developed often cheaply built "good for us" part in our cars....
Use C4 oil. Use 5th gear on motorway.
I think you are funny in well Knowledge And the do pretty good Research. Love watching your videos
What are your thoughts on getting a diesel car. I had one and started having DPF issues that would cost more then the car to fix. So I opted for a 2.0l Hyundai Petrol and don't seem to be regretting it. If the open road is hard to come by sometimes it seems like a lot of stress
Yes - DPFs have been badly implemented by some manufacturers.
John. I thought I might make you aware of what Toyota has done to "fix" my potential DPF problems on my 2.8l Prado. They have programmed the vehicle to do a DPF regeneration every 250 to 300kms. They also at my request switched on a message to let me know when that's occurring. (I am a little concerned about starting fires in grass). I get the feeling that their Techs don't know too much about the system though. I queried the need for the mileage interval as opposed to a pressure drop across the DPF and the head tech reckons the Prados don't use the pressure drop to trigger regeneration. Does this seem right to you? Also does the mileage system seem right to you. I seem to have a lot of trouble getting real info about the Prado. Thankyou you in advance.
It's all a bit 'once over lightly' if you ask me
"The blockage is a symptom of a problem elsewhere". That sir, is correct, and that problem is the entire fucking Diesel engine. Designed for heavy machinery and 25 ton trucks not driving to the shops or the brothel.
recently was scanning a car for last regeneration, on a potential buy, and turns out the last regen km were on the future.
That car was to advanced for me, it could tell the future so I passed but I did not report it to the authorities, can they do anything about it?
“I don’t want to belong to any club that would accept me as one of its members.” - Groucho Marx 😁🙃😎👍
Well spotted. 13 out of 10.
I thought it was Oscar Wilde.
Bastard. I wish I'd said that Whistler.
@@AutoExpertJC You might want to be careful with your MALS campaign. Given the current shitshow and trends around the world, you may find yourself being elected.
@@andrewthomas695 Whether he wants it or not! 😉
The owners manual for the Mitsubishi L200 (UK) says that you need to be doing more than 20 MPH for 20 miles while the DPF regeneration is taking place, it also states that fuel consumption will go up during the process and that the DPF regeneration will raise the oil level in the sump due to some diesel getting past the rings. To me this suggests that rather than burning lean it burns rich allowing extra fuel to get to the DPF, I can only assume that in order to burn this in the DPF they must bypass some air from the turbo in some fashion,either directly or by valve timing on the engine itself.
When a DPF 'activates' a burn cycle, what does that do to the temperature and composition of the exhaust out the tailpipe given that a DPF (and petrol equivalent version) sounds like a tiny jet engine turbine without an actual turbine.
Dmax dpf regen egts are about 450 to 500.
John, Could you please review the 2020 Pajero Sport. Thanks
Love your athiesim John.
If you have DPF issues I can recommend you start with loose intercooler pipes, then dirty or out of tolerance MAF and MAP sensors. After that look at differential pressure sensor piping for leaks and the sensor it'sself.
Itself!
@@BadDriversOz Samsung auto correct isn't that great some times.
@@MrDanjacs Haha! I see! Glad I don't use my phone!
Hey John love your ute reviews, whilst other so called journos just memorize the spec sheet you tell the facts 👌 would you buy a ur bt50 or a kun26r hilux 2013 to 2015 build. Cheers mate
John. If you get a chance, can you do a video review on the perpetual motion machine from South Park. That would be a good laugh.
OK - I might build one...
@@AutoExpertJC Will it feature many many many Mingmoles? {if = yes -> proceed}
@@AutoExpertJC 1st April episode please
👍
How do those MMs do that stuff?
I have an audi tdi allroad that sometimes, specially when i drive in the city the coolingfan starts and it smells like sh’t. The fan keeps going a while after i shut the engine off. I always thought the clutch is about to break down? (Automatic dualclutch) but it is dpf re engering? The coolingfan do start sometimes on the highway also. But temp is always fine. I also did egr and adblue delete on the car
Diesels don't melt themselves if they run lean. Also most DPFs wont last the life of the engine. When they burn off the soot it turns to ash and remains in the DPF. When it gets full of ash it needs removing to clean or replaced.
Just watched this as my car is passive regening a lot. VW Passat B6. So tell me. Do i drive it on the motorway in 5th or 6th? And for how long?
I’ve been told 50mph, 5th gear at 2,000 RPM (6th gear at that speed only hits 1500rpm) for approx 15-20 minutes. 🤷🏼♂️
My life experience =
Use C4 oil.
Always drive in 5th on motorway 30 mins or so, once, every tank of fuel (some will clean much quicker than that, but if yours is backed up, the longer the better). Tank needs to be at least 1/3rd full to do a regen. If you have an 8 speed, 6th or 7th gear is probably fine, just stay above 2000rpm.
Use an EGR crankcase filter with 1 micron coalescing filter media. Some vehicles have specific off the shelf types to fit, others like the RCC351K are a great choice. The sooner you install one, the better.
If you have a fuel vaporiser, have it cleaned every 50k. DPF itself every 100k, a clean is prudent (professionally cleaned). Otherwise have a crack at removing it and cleaning yourself, there are some great guides online.
I live in UK 🇬🇧 and have a European 2013 Vw passat R-line. Now my engine management light has come on a few times then it goes off. It’s been into the garage and they have said it’s my EGR, if the DPF goes through a regeneration to burn off carbon how can you stop the items like the EGR from getting Carbon build up
What if there are no highways around? Is it shit to do it with 3rd gear / ~2000 rpm for 20 minutes or so?
I am a fan of Dunning/Kruger. They rock.
Hi John, have you got a clip on Mazda’s diesel usually a CX5. Please point me in that direction. Ta
Hi, I'm driving along ford transit custom upto temp and engine tone or exhaust tone seems to change, then there is a smell of burning. Is this dpf regeneration?
about John cadgon brand volvo and polestar ?
G'day, thanks for the no bullshit vid.
I have a 2013 Benz OM651 diesel twin turbo, it is also a 6 speed manual (only one in Aus)
Can l drop a bit of DPF cleaner in the fuel and do a two hour run @1500 RPM 6th gear ?
The DPF in the isuzu mux/dmax will active regen while stationary or in low range / slow work, no issues. I know, mines done it and there is a gauge
80MPH in a transit? Every fat builder in London does 80 with 2 other fat mates and the back overloaded with bricks and cement......
Can you do one on how to protect your self form the heavy metals in the dpf fillters.
@@davexb6595 oh i wish someone had warned me sooner.😁
Excellent
I've run a Fortuner for 140,000km since Feb 2016 and been through the DPF/Smoke Machine process. From the little information that has been available over that time is seems that the original Toyota DPF regen setup did not use any data from pre or post DPF pressure sensors. It was a pre-programmed and timed schedule based on laboratory testing of a sample of engines in simulated running conditions.
Guess how well that worked. What was that line about Lies, Damned lies and Statistics?
One of the subsequent ECU updates shifted the Regen trigger to occur from the vehicle Sensor data, along with the manual burn button becoming available to some Customers.
From my own experience it appears that once the DPF gets beyond a certain level of saturation, the manufacturers suggestion of time spent at highway speed / cruise is just not effective. I routinely drive for an hour + at 100Km/hr and as soon as I come to traffic and the first stop, my idle speed immediately increases as the ECU attempts to burn off the filter.
The Dealer has been great all this time, but from the Customers perspective it looks like the service teams just aren't informed by the technical people at head office as to what to do and what the issues actually are.
Any connection between MALS and the unprecedented run on toilet paper in Australia?
Brilliant info... and so funny 😁
Thank you for the vid.
I have a 2013 Toyota Yaris with a DPF and the engine has 130.000km (80.000 miles). I have a problem with the oil level due to very frequent regens (I counted that regens occur every 250-300 km. So the oil level increases at every 2.000 or 3.000 km and a spanner turns on on the dashboard. I visited a TOYOTA dealer last year and they said that the DPF is in a good condition. Three months ago I visited another mechanic because the spanner was on again. He made a forced regen (after that the DPF was at 15%). Also he changed the oil. Now the spanner is on again and the mechanic says that I have to change the oil... This is very confusing and I am kind of desperate. It is simply unaffordable to have an oil change every 3 or 4 months. So my question is: If the DPF is in a good condition, then why does my Yaris regen so often? Could it be a problem on the electronics or the engine management system? Could we simply adjust somehow the way or frequency that regens occur, perhaps by using some additives?
Good primer on DPFs but not entirely correct.
Remote desert tracks (and the suburbs) would be littered with abandoned new 4WDs if they had to drive at the speeds mentioned in order to complete a DPF regen.
I've been on remote tracks a few times and watched my new vehicle complete DPF burns whilst grinding along in low range at 10-20Km/hr.
Temperature is the critical factor in burning off the soot. The burn process occurs somewhere between 500C to mid 600C. I have seen it reach 700C (aluminium melts at 660C).
Driving faster doesn't necessarily speed it up.
Also, a DPF burn won't start (or resume) until the engine is warm. In the colder months this can take 5-8kms in my car around the city.
If your trips are that short then a (modern) Diesel car isn't the best for that purpose.
The burn process is complex and adaptive, eg. it can behave differently at highway speeds vs suburb speeds under ECU control.
rsvp for more.
Spot on 100%
DPF regeneration always starts when I'm about 2km from home.
Hello John, May I suggest a video on Carbon Cleaning? This is where chemicals are pumped into the engine to clean Carbon deposits. Usually from people who visit you at your home with their bag of toys.
about John cadgon volvo truck and volvo car collision ?
Why are the comments disabled on so many of the videos from this channel?
I know man, I’d like to know that as well 🤔
I drive a toyata and when it fires up the white smoke would make an effective smoke screen.
You made me laugh out loud. Thank you.
Thanks John for that, no I feel fully illuminated!
Roger Rarebit More like a disciple on the road to Damascus suddenly filled with the inspirational teachings of the Holy Spirit- Mine eyes have seen the coming of the Lord. Glory, Glory Hallelujah. Sometimes listening to a John rant can affect me like that. Vote Cardogan 1 for PrimeMincer.
Really, there should be a way to trigger manual DPF regeneration without the need to visit the dealer.
Please advise if you know how to start manual regeneration
Active regeneration only happens above 350deg c when running lean.
If the EGR system is working to control Nox the temperature needs to be above 500deg c to compensate for the extra soot coming from the combustion chamber..
The closer to stoichiometric a diesel engine runs the more soot it produces.
Diesel engines run almost forever running lean. but with today's emission regulations they run close to stoichiometric and that creates tonnes of heat and soot and dramatically reduces the working life of that engine
Ford transits have a seperate fuel injector & atomiser with a glow plug to ignite the diesel in the exhast just before the cat/dpf. A pulse pump on the front subframe pumps a small amount of diesel into the dpf during regen. By the way do you know your'e shirts on inside out lol
DPF equipped vehicles like the current 4wd diesel utes on the market in Australia can be a fire risk. In rural or forested areas where dry grass, crop stubble or leaf matter is present the risk of starting a fire when the the DPF is doing an active regen is much higher than with a non- dpf equippped diesel vehicle. I have to do a manual burn in my 70 series before heading into a lot of areas for my work.
Vehicles with petrol engines also have a similar issue. Drive in long grass shortly after driving on the highway (or under other high-ish load conditions) and your exhaust pipe can start a fire. Petrol engine exhausts often glow red hot under sustained high load...
@@nerd1000ify Diesel exhausts can glow red hot too mate and that's without any dpf shit hanging off.
John, for much better contrast in your videos I suggest lowering the illumination of the blurred shop background while maintainig good illumination of yourself in the future videos.
Everyone's a critic...
@@AutoExpertJC but some make a good point ;)
Hi John. Just in relation to the 'Bogan' term. The locations in NSW, Bogan river, Bogan shire, and the town of Bogan Gate were named after the local indigenous term way back when. A Bogan was an Aboriginal chief. The town of Bogan Gate literally referred to the entry to their territory. Back in the 70's when i was in school at Bogan gate Primary, we met the Bogan and other elders from that area during a school event. A bit disappointing to see the word brought down such.
That's interesting! Thanks! I only hear the term occasionally in videos and I live in Scotland so it's good to know what it should refer to
I hope you have a good one!
So driving a diesel car for extremely short journeys in the cold is not as bad - provided you take them out on the highway every so often? I love diesels.
John cadgon about brand lotus ?
Hey John time to bring back the Mighty King yesss !
Where can we get a MALS hat?
I do enjoy a Ming moll with accessible accessories.
Peak EGT is achieved at perfect combustion air/fuel ratio. In the case of a diesel, about 14.5:1 Contrary to popular opinion, after peak EGT, leaner is cooler (excess air). My Duramax operates as lean as 22:1. I don't like to see it richening past 18:1. DPF's also need to be cleaned every year or two to get rid of the ash plugs that build up. Ash plugs are the remnants of regeneration and are not combustible.
Short trips, engine now warming up -> unsuccessful regeneration procedures, extended service intervals, poor fuel quality, eco driving..
And people wonder why the DPF is clogged.. ?
Ive seen a few diesels redline at 2500rpm . Pretty sure old mate #1 is safe :D
Is DPF the same as DP what two humans can do?
6:26 I may be a bit behind the times diesel technology-wise, but I think diesels pretty much always ran lean (unless the engine's running wide-open, or course), as there's no obstruction or butterfly valve in the intake side of things. This would mean diesel engines always run lean - unless you're working the engine hard, in which case you're close to max fuel delivery and thus close to stoichiometry - so there should always be extra oxygen for the DPF to do its regen voodoo when the engine's under low load.
Please correct me if I'm wrong (or just out of date.)
Cheers, mate.
Like me on a fast learning curve, diesels now have throttle butterflies that are controlled by the Jesus box, it is used to lower the inlet pressure so the EGR gases will flow from the exhaust pressure manifold into the inlet. Exhaust Gas takes the place of good clean air in the cylinder so the next charge burns cooler, reducing NOx.
Thanks, Ray - you can tell I'm from an older time. :-P
ray is a little out of date there. the normal turbo types use a throttle butterfly, but more modern diesels use the variable turbo to increase exhaust back pressure so its higher than intake pressure. also the addition of a egr cooler to 'concentrate' the egr so less difference in pressure is required (more egr in for the amount of egr flow).
Hello, John!
Is there any statistics about GPF (gasoline particle filter) behaviour in real-life after some years when brand new petrol powered vehicle left the dealership doors?
Seconded - neat new technology - how is it getting on?
You’d be a better PM than the current. Perhaps actually climate change policy would be created.
Gotta love the old Isuzu 4BD1T '...' no such problem.
Just don't breathe the exhaust.
@Bernhard Jordan What about the person behind you?
You could also throw in planes ,trains,trucks and buses
John, you mention “running lean” in relation to diesels? Please expand I thought diesels were nearly always lean unless there’s soot shooting out the pipe. No throttle = little or no control over air intake. Add or subtract fuel to regulate power. Hence nearly always lean of stoicomerric (excuse the spelling). Maybe revisit your applied physics ! GK
I’m glad someone else picked that up too. Fuel equals heat in a diesel. I think he’s confused with petrol engines running lean & therefore hotter. Happy to be corrected on my understanding of the process. Brad.
Or he doesn't know what he is talking about!
As in changing the injection curve to allow additional oxygen through to the DPF - that is effectively leaning off the burn in a diesel. In mechanical systems the injection rate will always be on the heavy side as the rack is preset and unable to react - the modern computer controlled systems allow a great reduction in injection rates as it can sense many parameters actively and adjust as needed, that is how the great advances in economy are achieved but also where so much of the complexity and potential for things to go wrong play out... The DPF is there to fix a big issue with the diesel engine - the particulates kill us or any other oxygen breather that gets gassed out. Until the diesel became increasingly a choice in regular cars due primarily to economy of driving and extended lifespans over high mileage petrol equivalents there was no impetus to catch and kill these particles. I personally don't like diesels after the 90's or earlier - but the modern stuff is what we need to get used to...
I don't think @Boat Beard follows what he's saying either :-P
I'm a little surprised at his disparagement of "revving its tits off". While tits should always remain in their proper place, using one gear lower than you would otherwise will reduce the engine load and send more excess oxygen down the exhaust. Once the DPF reaches regeneration temperature, the process can become net exothermic and self-sustaining, given enough oxygen, so "driving normally" (higher loads, lower revs) will probably make the fire go out. Of course, this presumes the driver is aware that a regen is underway. In the vehicle I drive (Alfa 159) the engine sound changes slightly, and the turbo boost decays more quickly on overrun.
John, apropos god-botherers. You should listen to the SPARKS' song 'What the hell is it this time?'. I think you would enjoy it.
How does a diesel run lean?
With two flat tyres on one side..
Diesels always run lean. Set them up to run stoichometric and they emit giant clouds of black smoke (see diesel dragsters). They are 'stratified charge' engines where the fuel air mix near the injector is much richer than the average in the cylinder, so when the engine has a near stoichometric mixture overall the region near the injector is really rich, leading to large amounts of soot in the exhaust.
I wish I could understand this dude
John Deere shouldn't breed I guess 😅
IMPORTANT: Select a suitable space to park the vehicle and lower all implements to the ground.
2. The engine speed elevates to 2200 rpm.
3. During the parked cleaning process, the high exhaust temperature indicator (B) and the park cleaning symbol on the switch illuminate.
NOTE: The parked exhaust filter cleaning process takes 30-45 minutes to complete.
If operator disregards indicators and continues to operate machine without allowing a parked regeneration, engine performance is reduced and machine function limited. A recovery regeneration procedure by a John Deere dealer is required.
DPF or DPD Regeneration is not determined by road speed what so ever.
It's determined by exhaust temp, Pressure and km traveled.
Regeneration can be passively started when setting in traffic, that being said
The vehicle manufacture suggest maintaining a constant speed above 60kph to allow surfactant air flow past the exhaust.
So what you are saying is the dealers are allowed to break the law emissions wise? Yet a manufacturer and owner/driver isn't allowed to do this with a manual DPF regeneration?
No - that's not what I'm saying at all.
@@AutoExpertJC OK but is that the case?
You have my vote John, if for any reason but to troll every aussie bogan out there!
Is it likely DPF was invented for long haul trucks where they will passively regen as they haul freight down the highway?
DPF delete and EGR delete, retune, done, my golf has no DPF. More power better fuel economy and less contamination in the oil. Running rich ro get the exhaust hot enough contaminates the oil with fuel and is bad. The dealer regen just static regens it and revs it to 3k for 20-30 minutes and then requires an oil change, anyone at home can do the same with an OBD scan tool, even a cheap OBD11 from ebay.
So have you had an exhaust gas analysis? Dieselgate revisited?
And screw the environment
@@gavinb9627 Don't need one, live in Victoria, we don't have the Gestapo force us to RWC our cars every year, and all that money saved from having a clean breathing motor.