The additive enables the soot to be burnt out at a much lower initial temperature than would otherwise be the case. Without an additive, the DPF can would need to be red hot to start the process going.

Euro Cat III diesels (and earlier) don't have a DPF - just an oxidation catalyst near to the exhaust manifold which works in open loop mode. As the UK diesel MOT test is concerned only with smoke opacity, it doesn't even have to work here.

If mine gives any trouble it will be "rodded out".

rotodiesel.

NB. Euro Emissions Categories use Roman numerals for diesels and Arabic numerals for petrol engines. eg Cat III - diesel; Cat 3 - petrol.

thanks rotodiesel.your explanations are priceless.I want to learn as much about the DPF as I can

On Tuesday at a dealer I noticed that in the rack with brochures was a Skoda leaflet explaining the issues with DPF's and advising against buying one if your driving style wasn't suitable.

I was at a dealers yesterday Thursday and picked up one of The Diesel Particulate Filter brochures but their is no date of issue in it. HTH.

I dont particularily agree with the way that this thread has been bumped several times by the OP when it seems that it was just one incident with his car that seems to of been resolved.

It did make interesting reading though, learnt quite a bit about the DPF. I googled and found this:

Diesel Particulate Filters (DPF) : Diesel particulate filters - The AA

and this:

http://www.iconia.org.uk/files/Diesel%20Particle%20Filter%20Recommendations.pdf

Maybe a sticky should be made (or 2, one in Superb section, one in OctyII section) as a reminder for owners of these cars (superb with 8v and vRS TDi) that have a DPF on how to drive them with consideration to the life of the DPF. I guess that this is all in the manual but things are often overlooked.

Steve

Like it.. the AA saying hard driving may be required

That's incredibel! A manufacturer advising you not to buy one of their vehicles!

Is the notice dated?

If yes, then people who bought a vehicle before this date may have a legal case, class action etc.

I wonder if anyone could get hold of a copy, PDF and post it?

Try this... jpeg files though - I can't seem to upload the pdf I made cos it says the file size exceeds my available space, but I've not uploaded any other files before!

[ATTACH]20425[/ATTACH] [ATTACH]20426[/ATTACH]

and if you really want to see the cover...

[ATTACH]20427[/ATTACH]

no date of issue visible...

Now, how do I manage to get a pdf uploaded - the system indicates max file size of 9.77Mb, but it won't accept a file half that size:confused:

Was at JBS this weekend and got talking to Kev as my next car will probably have a dreaded DPF. He did say that they are starting to look at mapping out the DPF via a remap to that it can be removed.. He did say its early days, but it looks like "Custom Code" is working on this at least.

Im at least 18 month away from changing my car, so he did say developments will be well established by then....

Was at JBS this weekend and got talking to Kev as my next car will probably have a dreaded DPF. He did say that they are starting to look at mapping out the DPF via a remap to that it can be removed.. He did say its early days, but it looks like "Custom Code" is working on this at least.

Im at least 18 month away from changing my car, so he did say developments will be well established by then....

Make sure they are talking about the Superb. Many are working on or have already sorted other cars in the VAG range but the Superb has a fairly unique system & one that is unlikely to appear again on any other VAG cars so returns on development costs will be limited

Rotodiesel..

You said.

''VAG's "solution" to Euro IV compliance is a bodge - especially so on the Superb where no provision (understandably on an ancient design) has been made to accomodate the soot filter near the engine. Putting it at the back end of a long wheelbase car makes it very difficult to get it hot enough.''

The DPF on my Superb is fitted closer to the front of the exhaust, approximately beneath the handbrake.

Jenks.

The additive enables the soot to be burnt out at a much lower initial temperature than would otherwise be the case. Without an additive, the DPF can would need to be red hot to start the process going.

Euro Cat III diesels (and earlier) don't have a DPF - just an oxidation catalyst near to the exhaust manifold which works in open loop mode. As the UK diesel MOT test is concerned only with smoke opacity, it doesn't even have to work here.

If mine gives any trouble it will be "rodded out".

rotodiesel.

NB. Euro Emissions Categories use Roman numerals for diesels and Arabic numerals for petrol engines. eg Cat III - diesel; Cat 3 - petrol.

If the DPF can just be ''rodded out'' why all the fuss? Surely this is not the case or have I missed something?

Jenks

It's the Euro Cat III oxidation catalyst near to the engine which can be rodded out, not the DPF fitted to later Euro Cat IV cars.

The DPF has to "see" a pressure differential across it for the management system to accept that it is functioning correctly. Rodding out a DPF would reduce this differential to such a low value that a fault code would be logged.

The DPF on the Superb is at the back of a long wheelbase car. Others such as the Golf/Octavia have them nearer to the engine where they run much hotter. As VAG no longer produce cars of this size with NS engines, there was no development work done - hence all the problems.

I would not have a Superb with a DPF and the taxi trade are aware of this too - so watch the residuals.

rotodiesel.

It's the Euro Cat III oxidation catalyst near to the engine which can be rodded out, not the DPF fitted to later Euro Cat IV cars.

The DPF has to "see" a pressure differential across it for the management system to accept that it is functioning correctly. Rodding out a DPF would reduce this differential to such a low value that a fault code would be logged.

The DPF on the Superb is at the back of a long wheelbase car. Others such as the Golf/Octavia have them nearer to the engine where they run much hotter. As VAG no longer produce cars of this size with NS engines, there was no development work done - hence all the problems.

I would not have a Superb with a DPF and the taxi trade are aware of this too - so watch the residuals.

rotodiesel.

So if the DPF is at the back of the exhaust system on my Superb. What is the cylinder welded in line in the exhaust directly beneath the Handbrake, if it is not the DPF?

Jenks

Stuart, is yours out of warranty yet?

Can you not replace the exhaust with a "straight throw" one?

So if the DPF is at the back of the exhaust system on my Superb. What is the cylinder welded in line in the exhaust directly beneath the Handbrake, if it is not the DPF?

Jenks

Thats where it is, On my earlier posts I had refered to it at the end of the exhaust as that is what the Skoda dpf manual appears to show it so if I have misled anyone Im sorry :O At that time I had only been looking at the manual & hadnt had the car up on a ramp.

Stuart, is yours out of warranty yet?

Can you not replace the exhaust with a "straight throw" one?

If only it were that simple but it isnt. You have to somehow recreate the pressure difference across the DPF before you remove it which is what the car reads.

If anyone finds a totalled Superb 140 let me know as I need a system to "play with"

Well its ferkine done it again !!!!!!!!!!!!!!!!!!!!!!!!

Light came on, 1 mile YES ONE MILE later & its in limp mode. Yesterday we drove to somerset & back at Jenkins cruising speed (no one passed us) so suitably purged. Today 4 miles from home light on, 5 miles from home & its limping !!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Dealer as always excellent, got it straight in & looking at it as we speak, as always no problems with the dealer, just the ***** at VAG who designed this mess & Skoda UK who washed their hands of it

Bah - You've got my number you know!!

Bah - You've got my number you know!!

Might be time for plan B, will talk later once the Garage have done the diagnostics.

...just the ***** at VAG who designed this mess & Skoda UK who washed their hands of it...

I believe Rotodiesel uses the term "cretin" and as for SUK admitting it... well, they still claim they know not of the pollen filter housing problem.

Still, good luck - and dare I ask what plan B is?

BTW there's a huge box of chocolates and some cake for the first person who works out how to remove a DPF... :P

I dare say Plan B will result in said choclates and cake being eaten by Mr J.

I dare say Plan B will result in said choclates and cake being eaten by Mr J.

Already, I can see a flaw in my plan.

Already, I can see a flaw in my plan.

Indeed, I hear that Plan B is already in the advanced stages and almost ready for implementation pending level of funding and how pi$$ed off he is. :P

Indeed, I hear that Plan B is already in the advanced stages and almost ready for implementation pending level of funding and how pi$$ed off he is. :P

Plan B has been ordered & deposit paid, weve reserved number 78 on the production run, awaiting spec & price confirmation from Italy, when thats anounced we have the option of deposit back or go ahead.

As to the Superb, If the dealers diagnosis is a pooped filter then I have enough amassed knowledge to attempt a removal, either by a combination of clever engineering & mapping or a can of petrol & a match.

Ive said it many times its a great car just ruined by some dumb ***** designer

Edited 22 December, 200817 yr by Stuart_J

Look forward to seeing plan B

Sensor that measures the pressure across the DPF had failed, New one fitted & car all sorted before Christmas & touch wood seems OK

Looking at the problems you are having i would of sold it ages ago lol.

One thing though Stuart i work in the gas industry and have access to dp cells. Could always plumb one into the existing exhaust and see what dp the car runs across the DPF. I think you could block off both pipes to the sensor then induce a small pressure on one side to simulate the dp across the DPF and remove it from the exhaust system.

Looking at the problems you are having i would of sold it ages ago lol.

One thing though Stuart i work in the gas industry and have access to dp cells. Could always plumb one into the existing exhaust and see what dp the car runs across the DPF. I think you could block off both pipes to the sensor then induce a small pressure on one side to simulate the dp across the DPF and remove it from the exhaust system.

Similar things have been suggested & is a strong possibility.

1. You have to know when the dpf is clear to get the correct reading

2. The car does a check aparently before it starts that all the sensors are functioning. This has to be repricated or the car throw a fault.

I need to get a dpf off a scrap car to play around with but as yet I cant find a totalled 140 diesel