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Old January 30th, 2018, 10:14   #1
Rk2012tdi
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Default DPF cleaning

My 2012 Sport Wagen is in the shop for the second time in as many weeks. Replaced the EGR cooler, dash lit up like a Christmas tree. Now they say they have to replace the DPF. All under the emissions extended warranty. They of course went through the driving habits of owning a diesel but would not tell me outright how many miles, at what speed and RPM I should drive it to clean the DPF.
Does anyone have any info on this subject that VW for some reason is so secretive about?
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Old January 30th, 2018, 10:23   #2
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There are no hard and fast rules for this. It depends on at least several variables to initiate a regen. There is an app called Vag DPF, with that and android phone/tablet and an OBDII adapter you can monitor dpf regen status and see when one is about to happen. This would allow you to not shut down and keep driving until completed, if you so choose.

Are you short tripping the car a lot?
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Old January 30th, 2018, 11:09   #3
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Thank you for the reply. Yes we are frequently short tripping right now. My daughter is driving it to high school and back and occasionly into town. It Hasn't always been that way but she can't drive the truck. I have decided to take it on the interstate on weekends and hopefully that will help.
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Old January 30th, 2018, 12:10   #4
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DPFs do not like short trips.

Sounds crazy, but tell your daughter to run it out the highway for an hour once a week.
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Old January 30th, 2018, 13:19   #5
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You need to get that app and OBDII dongle I spoke of above. Use it to monitor your regens. When soot mass calculated gets to 24 (IIRC) it will regen. Drive it around until it finishes. If you do this it will solve your issues. Just driving it around with no knowledge of when it will happen will just waste time and fuel.

The app
https://play.google.com/store/apps/d...p.vagdpf&hl=en

https://www.youtube.com/watch?v=PaEt7hGeVAA

https://www.youtube.com/watch?v=cKxPy9Ry7Wc

http://forums.tdiclub.com/showthread...ghlight=vagdpf

http://forums.tdiclub.com/showthread...ghlight=vagdpf

Cheap OBDII
https://www.walmart.com/ip/MINI-Scan...&wl13=&veh=sem

Real OBDII
https://www.scantool.net/scan-tools/smart-phone/

Mine regens about every 240 miles with urban driving. Knowledge will set you free!
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Old January 30th, 2018, 13:41   #6
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Think about heavy trucks of yesteryear.

They would blow visible smoke when accelerating, not so much when running steady down the interstate.

Your CR Jetta does the same, it's just that the DPF traps the soot. Regens burn the soot down to ash, but even that takes up space in a DPF that will eventually be full to the point where a regen won't help.

As Oilhammer said, DPFs don't like short trips - they fill up with soot faster and will eventually fill to the point of needing to be replaced.
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Old January 30th, 2018, 14:00   #7
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If regens are happening and actively managed the soot accumulation can be burned off with little to no issue. It will take some time for enough ash to accumulate to cause an issue. DPF's don't like short trips but if managed properly it should be a non issue. Actively manage the regens and your short trip issues will go away I am sure. oilhammers info is lacking and generally won't work without a lot of wasted time and fuel.
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Old January 30th, 2018, 14:09   #8
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TLDR version

a few hard pulls once a week is all you need if you are only doing mostly short trips. Its all about heating up the catalysts
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Old January 30th, 2018, 14:29   #9
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I would disagree with that. A few hard pulls once a week will not do anything to the soot buildup. It needs to do a complete regen when called for. A full regen takes 10 to 15 minutes at temperature (1100F +/-). You think 30 or so seconds of momentary heat will do the same? I think not.
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Old January 30th, 2018, 15:13   #10
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Quote:
Originally Posted by Lightflyer1 View Post
I would disagree with that. A few hard pulls once a week will not do anything to the soot buildup. It needs to do a complete regen when called for. A full regen takes 10 to 15 minutes at temperature (1100F +/-). You think 30 or so seconds of momentary heat will do the same? I think not.

I should easily define a hard pull as any temperature above 1,000F and more like a long mountain pass. was not talking about a regen, just normal driving. Your right about the regen for sure. When i say hard pull on my car, its 1300 to 1450 for about 10 minutes on a race track lol.

Just another reason why Diesel engines now days are just soo poor in cost savings vs the old ones. Im glad i stuck with my AHU. i will never buy a new gen
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Old January 30th, 2018, 15:39   #11
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it should need a ten or fifteen mile drive at highway speeds (over 50 mph)(stopping for lights once in a while is ok) to finish a regeneration. call it 15 minutes.

the car will want to do one every couple hundred miles.

the car should also let you know by lighting up the DPF light if it needs one, and has not had a chance to complete one. and this has to be followed by the drive suggested. if you skip this, it is new DPF time.

in general, any light that shows up on the dashboard needs attention as soon as possible. you have to understand what is going on, and then can be advised if remedial action can be postponed.
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Old January 30th, 2018, 15:42   #12
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Quote:
Originally Posted by Rk2012tdi View Post
... I have decided to take it on the interstate on weekends and hopefully that will help.

as long as this is a 15 minute trip or more you should be in great shape.

once a month may be enough...
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Old January 30th, 2018, 16:19   #13
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Quote:
Originally Posted by meerschm View Post
as long as this is a 15 minute trip or more you should be in great shape.

once a month may be enough...
Again I disagree with this statement. A fifteen minute drive down the interstate when not in regen mode will not burn off the soot. I have preached enough. Let the OP decide what he wants to do and deal with the results.
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Old January 31st, 2018, 01:33   #14
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I only have one vehicle with a DPF, a tractor (2016). If it's running long and warm/hot there are less passive regens happening: more complete combustion, less soot. The system monitors flows through the DPF looking for increased pressure. When the programmed pressure trigger point is encountered the system will trigger a regen. Regens are managed differently in different systems, I don't know how VAG does them, but my tractor utilizes injected fuel into the DPF. In most cases running the RPMs at least at 1,800 should happen during a passive regen (can keep operating as long as RPMs are kept up). There's also a more hardcore forced regen, either triggered manually or commanded by the system- one completely stops the tractor, sets RPM to idle and allows the computer to run through the cycle (it'll command varied engine speeds as it burns the soot in the DPF). It's easier to do the regens on a tractor because there's both an engine speed control and a travel speed control- one can run the engine speed up w/o really affecting travel speed (generally speaking).

Just for a data point, using my only reference, my tractor, I've had ONE forced regen over the period of 260 hours, which, if I used my cars' average MPH of 41 would roughly equate to at least 10k miles.

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Old January 31st, 2018, 03:55   #15
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Quote:
Originally Posted by Lightflyer1 View Post
If regens are happening and actively managed the soot accumulation can be burned off with little to no issue. It will take some time for enough ash to accumulate to cause an issue. DPF's don't like short trips but if managed properly it should be a non issue. Actively manage the regens and your short trip issues will go away I am sure. oilhammers info is lacking and generally won't work without a lot of wasted time and fuel.

I am pretty sure I have a good handle on how DPFs work, thanks. I helped write the diesel ASE test questions, I am not exactly ignorant of the systems.

Asking someone to go around watching a bunch of data points to watch DPF regen status is not going to happen with most of the motoring population, especially a teenager, whom probably in her mind has much more pressing things to do. "Sorry, coach, I will be late for volleyball practice, I have to go drive my car RIGHT NOW to complete a DPF regen, be back in 20 minutes or so. Hopefully there is no traffic and my EGTs will stay up!" Yeah, no. Sorry, not going to happen.

And a DPF regen IS a "waste of fuel" and if we all ran around catering to the needs of the car's emissions systems, there would also be a lot of "wasted time".

For most people, the occasional 20-30 minute highway trip periodically will be sufficient. That is why they use that wording in the owner's manual. Nowhere does it say "Go buy a 3rd party data viewer, Velcro it to your steering column, and do XYZ or else." I get that as car nerds, we (I include myself in this category) tend to skew everything to the side of caution and the car, but the fact of the matter is most of the motoring public is NOT a car nerd, and they just want a nice frugal car to drive. Given the fact that stopped up DPFs on VAG products are very rare (must be, because I have only ever had to replace ONE due to this, and I have taken care of a LOT of these cars since new), the setup must work just fine most of the time for most people, most of which do not drive and schedule their lives around their car's emissions control system's needs and desires.

The OP's case is obviously not falling into the banner of normalcy and therefor he and his daughter may have to decide on either a regimen of driving style/data monitoring that the car likes OR get a different non-DPF car ( or delete this one) instead.
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