his whole DPF issue is very confusing.

 

Is it keeping a certain speed for so long or is it temp of the DPF that clears the soot???

 

My car just got delivered yesterday, it's now jus done 71miles and already has done an active regen 20mins into my journey to work, it's not really an issue because my journey is at least 46mins each way so there was enough time to finish.

 

I took it for a longish spin yesterday at least 50 mins but this was not on motorway but I'd thought the engine temp would of being enough to burn off the soot.

 

When delivered it had 29 miles on the clock and the only thing I can think of is it's jus been started short times for moving purposes and has'nt had a proper clean out yet.

 

It was a bit cold this morning -3 on the way to work but the engine oil reached 91 degrees by time I got to work.

Slightly worrying...

Both I think in answer to your question.

 

The DPF has to be hot enough to burn the soot off. But when the car is doing an active regen, the engine has to be above a certain speed (2,000 rpm I think), the car has to be above a certain speed (40 mph I think). But if you go too fast it won't work due to the extra wind/air flow through the engine bay.

 

How did you know it was doing an active regen?

 

Also, your engine is new and running in. I have definitely noticed the frequency of the regens reduce as the car has done some more miles.

 

The system that controls the DPF on the new cars is very good/sophisticated, I leave it to do what it wants and have had no issues in 30,000 miles.

 

I'd have a quick read of the user manual.

Edited 24 February, 201610 yr by meb90

I've just seen your post in the pinned topic in the Octavia MK3 section.

 

The post just above yours has a good explanation of the different stages of the regeneration process.

Edited 24 February, 201610 yr by meb90

I drove home from Conway last sunday, about 140 miles, dual carriage ways and motorways. When I parked up at home the car was doing a regen. I came home at 70 + mph but because of the wind flow in the Engine bay and under the car it was too cold for a regen. It's only because the last 5 miles from home the slower speed of the car warms everything up, hence a regen started.

 

Just let the car do it's thing

I've just seen your post in the pinned topic in the Octavia MK3 section.

 

The post just above yours has a good explanation of the different stages of the regeneration process.

 

It is correct it does have some usefull info.

 

Both I think in answer to your question.

 

The DPF has to be hot enough to burn the soot off. But when the car is doing an active regen, the engine has to be above a certain speed (2,000 rpm I think), the car has to be above a certain speed (40 mph I think). But if you go too fast it won't work due to the extra wind/air flow through the engine bay.

 

How did you know it was doing an active regen?

 

Also, your engine is new and running in. I have definitely noticed the frequency of the regens reduce as the car has done some more miles.

 

The system that controls the DPF on the new cars is very good/sophisticated, I leave it to do what it wants and have had no issues in 30,000 miles.

 

I'd have a quick read of the user manual.

 

 

I've just seen your post in the pinned topic in the Octavia MK3 section.

 

The post just above yours has a good explanation of the different stages of the regeneration proce

I was jus supprised.

 

I knew it was doing an active regen because of the burning rubber smell and the higher idle.

 

There was no issue because the regen finished before I got to work.

 

Is there any issues if it keeps doing Active Regen in this manor?? 

Edited 24 February, 201610 yr by davitc

Is there any issues if it keeps doing Active Regen in this manor??

You live in a manor? I'm impressed.

Is there any issues if it keeps doing Active Regen in this manor?? 

 

None I'm aware of. It is programmed to do an active regen after a number of miles (I can't remember how many).

 

The system will take care of itself, you don't need to worry. Only worry if you get one of the warning lights on the dashboard, then follow the instructions in the manual. But I haven't had any warning lights yet.

 

Also, the burning smell will get less as it does more regens, but I also think it will do fewer regens as it gets a bit older.

Get used to it, to make a tractor smell like a bed of roses it's gotta be done, could be worst, you could have an Adblue system that shuts the car down when it's empty.

Seriously, to keep diesels getting through emmissions tests these things have to be done.

Regards

T

I think the CR engine in the MKIII Vrs does more little regions to keep the DPF empty.

 

The PD Deisel engine in the Pre FL Vrs waited until the DPF was almost full then had trouble getting rid of everything.

 

A little, more often is better.  I always use Quality fuel which contains cleaners ans additives, not like the cheap supermarket sh1te .

 

My Vrs only runs on premium Shell diesel 

 

 

 

" Other brands of diesel are available "

Edited 24 February, 201610 yr by Auric Goldfinger

I think the CR engine in the MKIII Vrs does more little regions to keep the DPF empty.

The PD Deisel engine in the Pre FL Vrs waited until the DPF was almost full then had trouble getting rid of everything.

A little, more often is better. I always use Quality fuel which contains cleaners ans additives, not like the cheap supermarket sh1te .

My Vrs only runs on premium Shell diesel

" Other brands of diesel are available "

I've ran cars on supermarket fuels for years and never had an issue...where do you think the fuel comes from? Asda et al don't own their own refineries!

Granted the likes of Vpower will be better for your engine, but I bet the results are negligible.

My current MKII VRS did exactly the same behaviour.  Regen very quickly from new and at another time after a 150 mile run on holiday.

 

Been driving for 3 years no problem - sounds as though nothing wrong with your car - enjoy it.

I've ran cars on supermarket fuels for years and never had an issue...where do you think the fuel comes from? Asda et al don't own their own refineries!

Granted the likes of Vpower will be better for your engine, but I bet the results are negligible.

 

I think Quality fuels are better for cars with a DPF. Supermarket Sh1te for " p " reg  or none DPF Diesels will be fine

Edited 24 February, 201610 yr by Auric Goldfinger

Mine did the same when I first got it. Seemed like it was doing a regen every other day but now it's got 4000 miles and it's definitely less often. Probably something to do with being new and still 'running in'.

 

...

Granted the likes of Vpower will be better for your engine, but I bet the results are negligible.

 

 

I like to give it a tank of vpower diesel every other month.

Mine also did this on the day I picked it up after driving just 50 or so miles from the dealer back home. 70,000 miles later it still does active regens every 3-4 days and I do over 500 miles a week, not had any issues with DPF warning lights so just accept that it does it's thing all as it's designed to.

They do it quite often when new as Matt Pez says...with mileage it settles down and typically occurs perhaps once every 300 miles or so.

I reckon mine does it perhaps one or twice per week and I do a good few hundred miles per week.

I wouldn't worry about it, it may have been moved around the forecourt or done lots of short journeys so I see no issue in it needing a regen at that mileage. It calculates when to do a regen based on how blocked it is (the diff pressure across the DPF- the higher the diff the more blocked it is)

 

Doing a lot of regens due to short journeys is bad as you end up with fuel in the oil.

I think the CR engine in the MKIII Vrs does more little regions to keep the DPF empty.

 

The PD Deisel engine in the Pre FL Vrs waited until the DPF was almost full then had trouble getting rid of everything.

 

A little, more often is better.  I always use Quality fuel which contains cleaners ans additives, not like the cheap supermarket sh1te .

 

My Vrs only runs on premium Shell diesel 

 

 

 

" Other brands of diesel are available 

I jus put the regular shell diesel in on my first fuel up, every performance car I have used branded fuel and in a few like my V40 T4 I used only Shell vPower and always found it run better although people say it the placebo effect sometimes.

I wouldn't worry about it, it may have been moved around the forecourt or done lots of short journeys so I see no issue in it needing a regen at that mileage. It calculates when to do a regen based on how blocked it is (the diff pressure across the DPF- the higher the diff the more blocked it is)

 

Doing a lot of regens due to short journeys is bad as you end up with fuel in the oil.

 

My commute is at least 50 mins but through built up area's mostly. I must admit it didn't do an active one on the way home though.

 

My car is on Variable service so hopefully it will adjust :-).

Edited 24 February, 201610 yr by davitc

My current MKII VRS did exactly the same behaviour.  Regen very quickly from new and at another time after a 150 mile run on holiday.

 

Been driving for 3 years no problem - sounds as though nothing wrong with your car - enjoy it.

 

Thankyou  :clap:

 

So far I am loving it. First car I've owned in 5 years, being Cycling, Running, walking and using public transport depending on commute. Hired a lot of decent cars which I have enjoyed though nothing beats having a car on your doorstep

Edited 24 February, 201610 yr by davitc

My commute is at least 50 mins but through built up area's mostly. I must admit it didn't do an active one on the way home though.

 

My car is on Variable service so hopefully it will adjust :-).

It is much easier for it to regen on the motorway due to constant speed as the DPF needs to heat up so stop/starts arn't ideal but 50 minutes is a good drive so I don't think there will be any issues.

 

A bloke I used to work with drove about 4 miles to work in his A4 for 2 years, it barely got to operating temp so I can't see how it ever managed a regen but he never had the light come on.

I've ran cars on supermarket fuels for years and never had an issue...where do you think the fuel comes from? Asda et al don't own their own refineries!

Granted the likes of Vpower will be better for your engine, but I bet the results are negligible.

The Base fuel is the same but the additive that's added is different. I only use v power nitro, and I don't buy it for performance gain I do so as it has better additives that really do work. You get far less smoke coming out the back that probably equates to a cleaner burn. Not surprising as the cetain rating is higher. Also I got better mpg on my old car, the octavia has only ran on v power nitro and has only done one regeneration in 2500 miles that I noticed.

Edited 24 February, 201610 yr by Alpha2110

 

Doing a lot of regens due to short journeys is bad as you end up with fuel in the oil.

 

I could walk to work but me being an lazy old git I go in the car. Car is 2 years old, 17.5K on the clock and never seen the DPF light.

 

How do you end up with fuel in the oil due to short journeys ?

I could walk to work but me being an lazy old git I go in the car. Car is 2 years old, 17.5K on the clock and never seen the DPF light.

 

How do you end up with fuel in the oil due to short journeys ?

When doing an active regen the car injects extra fuel with the valves open which burns in the DPF to get it up to temperature to burn off the soot. If your car is trying to regen all the time then the extra diesel can make its way past the rings and into the oil.

 

If you arn't aware of your car regenerating really often or constantly interupting one (fans running after engine has been turned off) you must be doing adequate milage.

 

I don't think its that common for it to cause problems I was just making people aware

Edited 24 February, 201610 yr by SuperbTWM

On an mot there is only a visual inspection of the dpf, you could hollow one out and replace it, I suspect the turbo would run cooler less likely to fail.