Hi!

After reading the VW service document PDFs I feel more relaxed but still few DPF questions tortures me.

1. How many km(miles) is set to force active regeneration, no matter the soot level?I've read here its like fixed interval to force, beside the other needed regens.

2. The car has 5000km and regens frequent no matter the driving style, does it make any difference by the time passed?

3. How long regularly active regen lasts?I've read in the documentation around 10 mins. Today I left it 30-35 mins on idle, the start stop did not activate, the rpms were still high. Had to go and stopped it.

4. Does the start stop enabled helps the DPF cycles or worsen the situation. Compared to idle.

P.s. I want to know more, no issues here.

I also have a question, does anybody know what consumption figures are during the regen? I am trying to figure out when the car is doing the regen, rpm in summer months will be increased because of climate control so its not a reliable detection method. That said, maybe the fuel consumption is increased because of climate usage as well...

Hi!

After reading the VW service document PDFs I feel more relaxed but still few DPF questions tortures me.

1. How many km(miles) is set to force active regeneration, no matter the soot level?I've read here its like fixed interval to force, beside the other needed regens.

2. The car has 5000km and regens frequent no matter the driving style, does it make any difference by the time passed?

3. How long regularly active regen lasts?I've read in the documentation around 10 mins. Today I left it 30-35 mins on idle, the start stop did not activate, the rpms were still high. Had to go and stopped it.

4. Does the start stop enabled helps the DPF cycles or worsen the situation. Compared to idle.

P.s. I want to know more, no issues here.

 

Not sure about number 3. From my recollection the regen has to be carried out at high revs?

 

http://www.vwgenuineparts.co.uk/DPF_regeneration.shtml

Hi Bigjim73,

At point 3 I was asking in case of active regeneration (fuel is being pumped into DPF,revs at idle are ~1000,start/stop system goes off,no light of DPF is lid). I guess you meant the case where the DPF light is on, then yes ... Right, need to be handles with 1800-2500rpms till it goes off..

Are you sure your car is really in "regen"?
There are many reasons why the idle speed can be increased - regen is only one of them.

 

In the infotainment menu -> Car -> StopStart this will tell you why the "StopStart" function is disabled.

There is no message for regeneration but it will display "Engine must be running" instead.

 

 

No need to worry yourself with the DPF, just drive your car like normal.

Stop the car when you need to, drive like you want.

You only have to worry about the DPF if the light comes on.

 

The latest DPF strategy for the VAG engines seems pretty good as there don't seem to be many/any people on here with DPF problems even after several years of ownership.

 

 

No need to worry yourself with the DPF, just drive your car like normal.

Stop the car when you need to, drive like you want.

 

This.

Are you sure your car is really in "regen"?

There are many reasons why the idle speed can be increased - regen is only one of them.

 

In the infotainment menu -> Car -> StopStart this will tell you why the "StopStart" function is disabled.

There is no message for regeneration but it will display "Engine must be running" instead.

 

 

No need to worry yourself with the DPF, just drive your car like normal.

Stop the car when you need to, drive like you want.

You only have to worry about the DPF if the light comes on.

 

The latest DPF strategy for the VAG engines seems pretty good as there don't seem to be many/any people on here with DPF problems even after several years of ownership.

 

Yeap Exactly, this is the double check I do. BTW found this myself and I was not sure it's right indication but looked like one.

 

The latest DPF strategy for the VAG engines seems pretty good as there don't seem to be many/any people on here with DPF problems even after several years of ownership.

 

Agreed, I haven't had a regen issue since I got rid of my 2007 PD Vrs in 2011.

IMO the Octy3 seems to handle DPF regens much better than my Octy2 CR.

1000 rpm idle and Auto Stop disabled means regen in progress.

No point in leaving it idling, regen is paused until engine is working.

Best to read through the pinned topic at top of this forum.

IMO the Octy3 seems to handle DPF regens much better than my Octy2 CR.

1000 rpm idle and Auto Stop disabled means regen in progress.

No point in leaving it idling, regen is paused until engine is working.

Best to read through the pinned topic at top of this forum.

 

Sure, I did it.

 

The question w/ the idle was - shall it regen if active regen started and I leave it idle (already arrived at destination) OR it will cancel itself.

My understanding and experience is that the regen will pick up when the car starts it's next journey. Car will warm up much quicker than normal and attempt to complete the regen. Sometimes if the regen has gone far enough it will not restart the regen.

AFAIK there is no point in idling the car, the regen won't complete at idle. The engine management system will choose one the two options I mentioned above depending on how far through the regen it has got.

I think the Euro 6 engine is programmed to do more frequent shorter regen sequences than the older engines.

I forgot to mention an experience I had recently. I got caught in stop start traffic while a regen was in progress. I had fan running at two brief stops to pickup stuff and idle speed raised and Auto Stop disabled. I then got caught in a stop start traffic jam for 20 minutes. The regen only completed after I got clear of the traffic. I used the old technique of driving one gear lower than normal to help the regen complete.

So there is nothing to be gained from idling your car while a regen is in progress.

I had my Octy 3 for 3 years. 7 miles each way to/from work. Interrupted the regeneration plenty of times and had no problems with it whatsoever. Only did long journeys once a month at best and the weirdest thing was the very next trip after a 300 mile motorway journey it would do a regeneration. ....why??? The things just sat at 2500rpm for 5 hours, why regen on a 7 mile journey immediately afterwards!

Maybe with my small journeys the DPF will be dead by 40,000 miles but for 3 years and 21,000 it was fine!

As others have said:

1. Idling won't help a regen, the engine needs to be under load.
2. Don't worry about it till the light comes on, 

I think it is every 600miles an active regen happens.

 

I'm on 6.5K now after 6 months and see some heavy start/stop traffic and have seen as low as 30MPG on a 20mile trip. I do a long 100mile trip prob every 6 weeks and I haven't had the light come on once.

 

I would prob think twice about buying another desiel at current driving routine but all in, I am not worrying or ready to get rid of it yet. But the car does seem to deal with it quite well (better than some other makes from what I've read) . Just enjoy it.

Edited 4 September, 20169 yr by davitc

I've posted this before on here somewhere; recently when I pulled into a Tesco's car park a regen was in progress so I went to a quiet corner and sat with the engine running at about 2000rpm for six or seven minutes and the regen completed, revs were back to normal and no fans running after switch off.. I make a habit of noting the engine revs before switching off and will allow a regen to complete if possible. Sometimes in the recent very hot weather the engine revs have been higher at idle because, I believe, use of the air-con causes the engine to speed up slightly to increase cooling.

 

Most of my local about town driving I use the sports mode which rarely sees the DSG out of S3. A recent 180 mile trip I was back in E driving mode so, assuming regen at about every 450 miles as mine seems to, a regen completed during the journey according to my calculations and total mileage. I averaging about 39mpg. This would probably be better if I used E mode more but like the responsiveness of S mode in about town driving

 

Regens aren't really a problem but are like an unscratchable itch a niggle that I suppose I will get used to in time.

Edited 4 September, 20169 yr by YMe

Dot you love it when you complete a 300km journey and just when you turn the engine off you can hear the fans go crazy...

I've posted this before on here somewhere; recently when I pulled into a Tesco's car park a regen was in progress so I went to a quiet corner and sat with the engine running at about 2000rpm for six or seven minutes 

That's just a waste of time and fuel.

 

This is the reason why people don't get told about the DPF when you buy a new car, Tesco's car park would be full of regenerating diesels and the smell of burning engine bay would be everywhere

Edited 4 September, 20169 yr by SuperbTWM

DPF = the reason I went back to petrol engines after 25 years of driving diesels.

 

The warning light on the dashboard was a ticking timebomb - it was a case of "when", not "if", it eventually illuminated.

VW have announced that they will start adding particulate filters to petrol engines from 2017, see http://www.autoexpress.co.uk/volkswagen/tiguan/96578/vw-to-add-particulate-filters-to-its-petrol-engines

Rather than this DPF nonsense why not a replaceable filter element? So what is currently burnt every so many miles can be collected in a disposable filter element.

Edited 4 September, 20169 yr by YMe

DPF's at the peak of a regen in the height of summer are hotter than the surface of the sun.

 

Probably better to keep it well contained.

 

Your point is valid though. Given the nervousness around DPF's why not retail them as spare parts but without any mark-up i.e. at cost price.

 

Add their replacement to the Skoda Fixed Pricing policy for cars over three years old (i.e. out of warranty) with a reduced labour rate.

 

If a new genuine DPF fitted by an authorised Skoda retailer was less than £500 (instead of the current £1,200) then people really wouldn't care what it is doing and when!

Rather than this DPF nonsense why not a replaceable filter element? So what is currently burnt every so many miles can be collected in a disposable filter element.

 

Because you would be changing a dirty filter every 1000km & as the exhaust runs at several hundred degrees you would be waiting for an hour at the petrol station for it to cool down enough to be able touch it.

Thanks all, folks for the answers

@CCTaylor - I don't get the idle behaviour, why it does not regen at idle? Or let me put it this way, why it still holds higher rpms and deactivates the Start/stop?I thought the active regen pumps fuel to heat the filter and could do it even on idle.
I don't insist being right, just thinking loud...
According to you, as far as I got it, it will keep undefined period idle, and actually work once the car starts moving, right?

@Sheldon.Cooper - exactly! you drive and it does passive regens all the time as the engine is loaded (you don't see those) but stopping in city traffic active one starts, as the heat is not blown away from the air flow when driving.
This heats the DPF and some trigger starts the active regen. This was very annoying before I read for the passive ones, still it's annoying

@davitc - thanks mate for the fixed interval. Same here, enjoying but trying to get deeper in the understanding

@YMe - you press the pedal and keep in idle at 2k rpms for 6-7 mins?

@toni8b - I love it! Like all of us

@PetrolDave - bad, bad news, next must be japanese then, where they still produce atmosphere petrols

Rather than this DPF nonsense why not a replaceable filter element? So what is currently burnt every so many miles can be collected in a disposable filter element.

 

Why is it nonsense, there's literally nothing for the owner/driver to do different driving a car with a DPF than without one, just drive it when you want, where you want then park up when you done.  The system is fully automatic and there's nothing for you to do.   So having a replaceable filter would just be hassle whereas now there is none.

Rather than this DPF nonsense why not a replaceable filter element? So what is currently burnt every so many miles can be collected in a disposable filter element.

Totally agree with you.

Dealers would probably like the drop the fibreglass filter out and put a new one in routine every 5-10k miles too.

While I agree the nothing to do is nice, there are issues with the filter light coming on and it's going to write off lots of cars when they get to say 10 years old or probably 150k miles.

This isn't good for the environment.

If a standard particulate trap was there, the filter would be good and wouldn't require extra fuel to be burned to regen, or high temperatures.

It would also mean the waste carbon could be dealt with in a suitable facility, rather than burnt off on the road, increasing localised pollution from the burning soot and the extra fuel.

Edited 5 September, 20169 yr by cheezemonkhai