Getting a bit sick of reading about this (DPF issues) and have only owned the car 5 weeks. But i am interested to know how often your PD170 trys to regenerate. I am not talking about DPF light coming on, but more about the increase in idle (to 1000rpm) and slightly lumpy acceleration? As far I am am aware, please correct me if I am wrong, the car will attempt to regenerate 5 times (or up to 55% full) before the DPF light comes on

Over the past 5 weeks, mines had a bit of work done; New DPF & Sensors and full set of Injectors (recall), but I still feel its trying to regenerate the DFP too often. For example, last weekend I done a 80 mile trip to wales and came back yesterday. Done about 10 local miles, then got in the car this morning to an increased idle and lumpy running (i.e attempting regen). I would have thought that after such a run on the m/way, it wouldnt need to regen after a small amount of local miles

I read on here recently, about someone who had too much oil in, causing excessive engine smoke, and regular DPF lights etc. Wonder if this is the same in my case?

I have noticed similar issue.. specifically after a long run. Drove 40 odd miles of A roads and motorways - no issues. The following day, after a cold start, immediately noticed a lumpy ride. It clears and has been fine since but am puzzled as to why it was necessary immediately after a long run, as you ask. Have also had injectors replaced and recent service too. Before this, never really noticed it...

The following day, after a cold start, immediately noticed a lumpy ride. It clears and has been fine since but am puzzled as to why it was necessary immediately after a long run, as you ask.

This isn't the DPF attempting to regen, there are a few of us suffering cold start issues on the PD170 engine, see here:

http://briskoda.net/forums/topic/189502-cold-start-problems-with-a-pd-tdi-170/

I am not talking about DPF light coming on, but more about the increase in idle (to 1000rpm) and slightly lumpy acceleration?

Are you sure it is the DPF trying to regen?

Assuming you had the DPF changed by a Skoda dealer and the fact that you also have had the injectors replaced as part of the ongoing recall then I would be going back to the dealer and telling them you aren't happy.

Have the problems arisen after the recent work was carried out i.e can you link the rough idle with the recent work?

If so then you should be going back to Skoda and asking them to put it right.

I had my injectors replaced back in November. I've never noticed an increased RPM or a rough idle either before or after the work was carried out.

However, my vRS is now reluctant to cold start since I had the injectors replaced, the colder it is / the longer it is left the worse it gets. See the thread linked above.

As far I am am aware, please correct me if I am wrong, the car will attempt to regenerate 5 times (or up to 55% full) before the DPF light comes on

See post #28 of this thread, it takes you to an article from the AA which explains in layman’s terms how the DPF works and what is required for a regen etc.

http://briskoda.net/forums/topic/221071-dpf-lighthow-often/page__hl__dpf

*edit, I can you have already posted on this thread.

This isn't the DPF attempting to regen, there are a few of us suffering cold start issues on the PD170 engine, see here:

http://briskoda.net/forums/topic/189502-cold-start-problems-with-a-pd-tdi-170/

You've misunderstood my post I don't have any issues cold starting. What I meant was - after leaving the car overnight after the long run, the next time morning I started and drove off, I immediately noticed the lumpy acceleration, ie it was regenerating. It cleared after a while and has been fine since. My query, like the OP, is why it felt it needed this regen after a long run..

Ah OK, part of the cold starting issue is a lumpy / rough idle (when it finally starts!), but after a few seconds it fine, certainly no issues when driving.

We are still assuming here however that it is DPF related and that the DPF is trying to regen, this might not be the case...

i agree with Liverpool Phil and Ciderspace. Have exactly the same problem as u guys. Since new injectors were installed 3 weeks ago car feels as if it is contantly attemping to do regens even after long motorways runs where i have driven in a lower gear to keep the revs up. Only yesterday i did 40 miles on the motorway only to find today that the ride is lumpy and can feel a regen coming on. I didnt have any of these issues before the change and do not have any of the cold starting issues that other members have encountered. It seesm strange that so many members are encountering the same problem after the injector changes.

Then you all need to be going back to Skoda and telling them that you aren't happy.

Until someone does this and allows their dealer to witness, diagnose and repair the fault we are all guessing.

Mine is booked in for next week.

i agree with Liverpool Phil and Ciderspace. Have exactly the same problem as u guys. Since new injectors were installed 3 weeks ago car feels as if it is contantly attemping to do regens even after long motorways runs where i have driven in a lower gear to keep the revs up. Only yesterday i did 40 miles on the motorway only to find today that the ride is lumpy and can feel a regen coming on. I didnt have any of these issues before the change and do not have any of the cold starting issues that other members have encountered. It seesm strange that so many members are encountering the same problem after the injector changes.

I had exactly the same issues after my injectors were changed a few months ago. I'm happy to say though that the car has calmed down to its original, pre-injector change condition. I heard someone say that it takes a while for the ECU to adapt to the new injectors. I dont know if this is BS or not but my car was behaving very odly after this change but after a few weeks it sorted itself out thankfully. In fact i cant remember the last time it carried out a regen. Immediately after the change it seemed to be doing them every 5 mins!

Ah OK, part of the cold starting issue is a lumpy / rough idle (when it finally starts!), but after a few seconds it fine, certainly no issues when driving.

We are still assuming here however that it is DPF related and that the DPF is trying to regen, this might not be the case...

Given the 5 weeks of DPF issues I've had, and the attention paid to listening and getting to when the car is going to regen, I am almost positive its trying to regen

I had exactly the same issues after my injectors were changed a few months ago. I'm happy to say though that the car has calmed down to its original, pre-injector change condition. I heard someone say that it takes a while for the ECU to adapt to the new injectors. I dont know if this is BS or not but my car was behaving very odly after this change but after a few weeks it sorted itself out thankfully. In fact i cant remember the last time it carried out a regen. Immediately after the change it seemed to be doing them every 5 mins!

I read something similar and hoping mine will calm down.

TBH this really isnt a major issue, afterall before the work my DPF light was on every other day. Its just the fact that now I know the car, and know its behaviour, when I do feel it trying to regen, I start heading for the nearest m/way, was actually late for work this morning as I took it up and down the usual stretch of m/way to sort itself out

BTW, no cold starting issues at all with mine since the work

See post #28 of this thread, it takes you to an article from the AA which explains in layman’s terms how the DPF works and what is required for a regen etc.

http://briskoda.net/forums/topic/221071-dpf-lighthow-often/page__hl__dpf

*edit, I can you have already posted on this thread.

As you will assume, Ive spent a lot of time reading around this issue and found the AA article useful.

What I cant get my head around is this.....I understand the principle of the DPF filter, its functionality and the regen process. What I dont get is that once it has performed a regen it doesnt take long at all before it wants to regen again??? Surely the filter cant be filling up this quickly? And if it is, whats causing it (oil overfill??) Or is it sensor related (i.e. the car thinks it needs to regen) but in my case, I have new sensors only days old???

Give up....going back to work :no:

I had exactly the same issues after my injectors were changed a few months ago. I'm happy to say though that the car has calmed down to its original, pre-injector change condition. I heard someone say that it takes a while for the ECU to adapt to the new injectors. I dont know if this is BS or not but my car was behaving very odly after this change but after a few weeks it sorted itself out thankfully. In fact i cant remember the last time it carried out a regen. Immediately after the change it seemed to be doing them every 5 mins!

I am hoping mine calms down too, no sign yet 3 weeks down the road. Will pop into dealers in next couple of days to see what they say about it. I cant inderstand though why changing injectors would cause DPF issues. I thought they would be totally unrelated parts. As I said before I had no DPF issues before and the car was superb to drive now its a nuisance.

surprise surprise DPF light on again .... This is getting ridiculous !

What I cant get my head around is this.....I understand the principle of the DPF filter, its functionality and the regen process. What I dont get is that once it has performed a regen it doesnt take long at all before it wants to regen again??? Surely the filter cant be filling up this quickly? And if it is, whats causing it (oil overfill??) Or is it sensor related (i.e. the car thinks it needs to regen) but in my case, I have new sensors only days old???

The DPF should only try to regen again so soon if the former regen was interrupted and didn't complete fully.

As I understand it the car speed (mph) and engine speed (rpm) need to be at a certain level otherwise the regen is stopped.

From a previous post a rough idle / increased rpm was being attributed to the DPF trying to regen. Surely if the car is stationary / ticking over the requirements for a successful regen aren’t being met - hence my initial suspicion that the symptoms weren't directly related to the DPF.

Even if the symptoms do in fact fade over time I'd still be keen to get it back to the dealers as soon as possible, for all we know the repeated DPF regens may be causing damage / premature wear to other components, if it's not the DPF trying to regen then there is something else wrong that’ll need diagnosing and fixing.

My injectors are being changed next week, and I have a brand new dpf. Will be interesting to see if I start getting dpf regens happening all of a sudden.

I have only noticed mine doing a regen twice in over a year of ownership. Both times sat at traffic lights and spotted the car on idle at around 1000rpm. No increase in regens or any other problems since my injectors were changed a few months ago. Its a 57 PD octy vrs .

Sent from my GT-I9100 using Tapatalk

Edited 4 January, 201214 yr by rustyGT

The DPF should only try to regen again so soon if the former regen was interrupted and didn't complete fully.

But surely if you are travelling according to the regen instruction, and for a while, then the car then begins to behave 'normally', you would have to assume the regen process has completed successfully??

But what if at a point late in your trip to Wales the car begins a regen. You don't notice due to the high engine rpm and road noise on the motorway.

You arrive in Wales and turn off the engine mid-regen. A failed regen.

The next time the engine is started the increased fuel fed into the DPF during the failed regen is still present and results in the lumpy / unusual idle?

I'm just guessing, but the DPF shouldn't be trying to regen at anything near idle rpm. When you say you 'notice' the DPF trying to regen what is it you are noticing?

But what if at a point late in your trip to Wales the car begins a regen. You don't notice due to the high engine rpm and road noise on the motorway.

You arrive in Wales and turn off the engine mid-regen. A failed regen.

The next time the engine is started the increased fuel fed into the DPF during the failed regen is still present and results in the lumpy / unusual idle?

I'm just guessing, but the DPF shouldn't be trying to regen at anything near idle rpm. When you say you 'notice' the DPF trying to regen what is it you are noticing?

I think what liverpoolphil is trying to say is if youre DPF light has come on and you have followed the correct procedure and the light goes off you can assume a full regen has taken place but then to encounter the lumpy drive and unusual idle a day or 2 after (or even a few hours) then something is not right.

When you say you 'notice' the DPF trying to regen what is it you are noticing?

The car sort of holds back now and then during the process (hesitant), increased idle (even at speed I can 'clutch in' and notice a higher idle, and the average mpg figures go s little astray....so if I drive at 2-3k rpm during regen, I can almost feel it happening. Its happened so many times (before the work was completed) that I am sure I can now tell its going to happen even it hasnt started

madskoda's just about hit the nail on the head

Edited 4 January, 201214 yr by liverpoolphil

The car sort of holds back now and then during the process (hesitant), increased idle (even at speed I can 'clutch in' and notice a higher idle, and the average mpg figures go s little astray....so if I drive at 2-3k rpm during regen, I can almost feel it happening. Its happened so many times (before the work was completed) that I am sure I can now tell its going to happen even it hasnt started

madskoda's just about hit the nail on the head

youre sure ure not driving my car ????!!!! Exactly the same symptons ... strange one.

I think what liverpoolphil is trying to say is if youre DPF light has come on and you have followed the correct procedure and the light goes off you can assume a full regen has taken place but then to encounter the lumpy drive and unusual idle a day or 2 after (or even a few hours) then something is not right.

I may then have read the opening post wrong, but as I understood it since the DPF, sensors and injectors were replaced the OP hasn't seen the DPF light illuminate, just a lumpy idle which we are assuming (through experiencing identical symptoms prior to the DPF replacement) is the DPF trying to regen.

Again I'm in no way a DPF expert but I think it would be possible for the DPF light to come on and then go off a few times as the soot level approaches the limit.

If this is true then you could witness the light illuminate, take the car up the motorway (which may increase the exhaust temperature just enough to reduce the soot level - BUT without actually performing a regen), the soot level then drops slightly turning the light going off and therefore leading the OP into thinking that a regen has successfully completed.

Or, the regen did in fact start, enough to reduce the soot level a little, but was then interrupted. As the soot level was only partially reduced it soon reaches the threshold again ("10 miles driving around Wales") that prompts the DPF to attempt to regen again, and again, and again.

Eventually the DPF is able to perform a full regen reducing the soot levels enough - which is what we are seeing with those who claim the repeated DPF regens eventually ease?

Edited 4 January, 201214 yr by silver1011

Just to add I've never had the DPF light illuminate in the 4+ years I've had the car and only noticed the regen occur a couple of times. So I'd say my driving style (ie mostly long journeys) accounts for this, though Im doing a few more short journeys of late so perhaps I will notice further regens. Having witnessed the regen (as described by those above - although I never checked the idle rpm) I have assumed it was completed as since then, the car has been just fine.

thought I would liven this thread up a bit as I am still having DFP issues :(

To date Ive had a new DPF (including temp sensor) and new injectors through recall. While there the pressure sensor was replaced too. After all this, the car is still attempting to regen (then light on if not regenerated quickly) every 48 hours, its really annoying now.

Generally the car does exactly what I want....well, but this regen issue is just not going away.

Going back to the OP, I read about one member having similar issues and eventually discovering the oil level was too high. Once this was corrected, the problems went. It make sense to me (in my non mechanical mind) that if there's too much oil in the car, it will produce more smoke and therefore not be healthy for the DPF.

I checked my oil level at the weekend and it did seem high so am thinking about booking it in for an oil change and filter. £120 from the dealer

Thoughts??