DPF issues, car going into limp mode.
Discussion
bertie said:
That's what it's had, but I varied between 65 and higher all in 4th gear so it was revving......well as much as a crappy diesel will rev.
I'll see what it says next time I get in at lunch, if not I'm swapping the bloody thing for something petrol!!
It doesn't need to be thrashed or driven in a lower gear to increase the engine revs. Just cruise at 70 on the motorway for 20-30 minutes, if it's due to regen, these conditions will enable it to.I'll see what it says next time I get in at lunch, if not I'm swapping the bloody thing for something petrol!!
Slippydiff said:
bertie said:
That's what it's had, but I varied between 65 and higher all in 4th gear so it was revving......well as much as a crappy diesel will rev.
I'll see what it says next time I get in at lunch, if not I'm swapping the bloody thing for something petrol!!
It doesn't need to be thrashed or driven in a lower gear to increase the engine revs. Just cruise at 70 on the motorway for 20-30 minutes, if it's due to regen, these conditions will enable it to.I'll see what it says next time I get in at lunch, if not I'm swapping the bloody thing for something petrol!!
Can't comment on the Porsche 4x4's / SUVs but the range rovers i've had will tend to stay in 6th or 7th gear (rather than 8th) on a cruise while the re-gen is taking place. If you stop just after a re-gen you can normally smell the very very hot exhaust system and hear it cooling down. Only other point to mention (as we're here!) is most diesels need a minimum quarter tank of fuel before a re-gen will start due to the extra fuel required during the process. Not saying a quarter tank is used or burnt, think the manufacturers use it as a minimum to start the process - checks and balances etc.
bertie said:
Just picked up on this thread as I am having the same issues with my wifes Macan.
I bloody hate diesel and would have much preferred a petrol but at the time I couldn't get a petrol Macan due to demand, and nobody said to me "do you do short journeys" when I bought it, nor does it say anywhere "only suitable for long trips."
Yes her driving tends to be short local trips, however this never happened with the XC90, Discovery, X5 or RR Sport that have come before it.
They clearly have an issue and it's f%&£ing annoying and utterly s
te.
It's like going back to the 1940s...oh have you greased the trunnions this week...grrrrr
If its less than 6 months old and the OPC haven't been able to fix it, which they cant, take it back and quote sale of goods act. They will have to give you a refund.I bloody hate diesel and would have much preferred a petrol but at the time I couldn't get a petrol Macan due to demand, and nobody said to me "do you do short journeys" when I bought it, nor does it say anywhere "only suitable for long trips."
Yes her driving tends to be short local trips, however this never happened with the XC90, Discovery, X5 or RR Sport that have come before it.
They clearly have an issue and it's f%&£ing annoying and utterly s
te.It's like going back to the 1940s...oh have you greased the trunnions this week...grrrrr
bertie said:
That's what it's had, but I varied between 65 and higher all in 4th gear so it was revving......well as much as a crappy diesel will rev.
I'll see what it says next time I get in at lunch, if not I'm swapping the bloody thing for something petrol!!
You are fighting a losing battle with this I'm afraid. I went through the same rigmarole. I'd tell my wife to take the long way home down the dual carriageway or I'd take it out for 20 mins. All it does is delay the inevitable. The 2.0 Petrol Macan is excellent btw. More George Best than Oliver Reed when it comes to fuel. I'll see what it says next time I get in at lunch, if not I'm swapping the bloody thing for something petrol!!
DJMC said:
Moonigan - I can't see a post where you say whether you tried "proper" diesel rather than supermarket?
This was 100% the reason my wife's 2016 X1 had a blocked EGR valve after 9 months of mostly supermarket fuel, and went into limp home mode.
I did have a spell of putting non supermarket diesel in but I don't think it made much difference. I think the problem was it would never fully regenerate without having the dealer clean it out. I also suspect the 3.0D engine that's been around in some shape or form since 2004 isn't the cleanest and VW Group have been papering over the cracks to get it through emissions for years.This was 100% the reason my wife's 2016 X1 had a blocked EGR valve after 9 months of mostly supermarket fuel, and went into limp home mode.
bertie said:
smudger911 said:
DPF re-gen not fully completing, diesel being sucked into the engine and oil dilution occurring.
How does one know when it's complete?I've just taken the Macan for a right royal thrash for 25 minutes on a dual carriageway but not idea if that's enough.
The 407 did use Eloys injection to light off the dpf at lower temps than other manufactures and this method works really well, apart from needing to refill the tank at about 70k at £80.
CharlesElliott said:
Quite a few people have rejected their cars or agreed with their OPC to get it replaced with a petrol. Talk to them and I suspect you will be reasonably well received.
There are also reports that an ECU re-flash is being worked on to help, but there's no date for it I've seen.
My wife's car is about 18 months old so I think it's unlikely to get it replaced.There are also reports that an ECU re-flash is being worked on to help, but there's no date for it I've seen.
The amount of AdBlue I've put in is astonishing given it's only done 10k miles.
It's being recovered by Porsche assistance tomorrow AM
OhThatHurtAbit said:
This may have been covered before, but for the Diesel Particulate Filter to work properly it has to be really hot. The particles then burn off which in combination with the AdBlue (urea) reduce massively the amount coming out the exhaust, often to less than that of an equivalent petrol engine, if Euro-6 compliant.
The problem with the short journeys is that the filter never gets hot enough to burn off the particles and then clogs up, hence the need to give it a good run at higher revs to get the DPF hot enough to re-generate and clear itself out.
The problem with petrol SUVs is that you're often lucky to get mid-20s economy on a run (and often much less) and a Diesel will get you 35-45mpg in many cases, hence why everyone wanted a Diesel in the first place. The rock and a hard place scenario...
Adblue is nothing to do with the DPF. DPF’s deal with soot which comes from locally rich areas of the combustion event. Adblue deals with NOX which comes from locally hot areas of the combustion event. Cars had DPF’s long before they had adblue.The problem with the short journeys is that the filter never gets hot enough to burn off the particles and then clogs up, hence the need to give it a good run at higher revs to get the DPF hot enough to re-generate and clear itself out.
The problem with petrol SUVs is that you're often lucky to get mid-20s economy on a run (and often much less) and a Diesel will get you 35-45mpg in many cases, hence why everyone wanted a Diesel in the first place. The rock and a hard place scenario...
PSA did have a system which used a fluid, called Elyos IIRC, to help with regen. But that was unquie to PSA and I don’t know how it worked.
Megaflow said:
OhThatHurtAbit said:
This may have been covered before, but for the Diesel Particulate Filter to work properly it has to be really hot. The particles then burn off which in combination with the AdBlue (urea) reduce massively the amount coming out the exhaust, often to less than that of an equivalent petrol engine, if Euro-6 compliant.
The problem with the short journeys is that the filter never gets hot enough to burn off the particles and then clogs up, hence the need to give it a good run at higher revs to get the DPF hot enough to re-generate and clear itself out.
The problem with petrol SUVs is that you're often lucky to get mid-20s economy on a run (and often much less) and a Diesel will get you 35-45mpg in many cases, hence why everyone wanted a Diesel in the first place. The rock and a hard place scenario...
Adblue is nothing to do with the DPF. DPF’s deal with soot which comes from locally rich areas of the combustion event. Adblue deals with NOX which comes from locally hot areas of the combustion event. Cars had DPF’s long before they had adblue.The problem with the short journeys is that the filter never gets hot enough to burn off the particles and then clogs up, hence the need to give it a good run at higher revs to get the DPF hot enough to re-generate and clear itself out.
The problem with petrol SUVs is that you're often lucky to get mid-20s economy on a run (and often much less) and a Diesel will get you 35-45mpg in many cases, hence why everyone wanted a Diesel in the first place. The rock and a hard place scenario...
PSA did have a system which used a fluid, called Elyos IIRC, to help with regen. But that was unquie to PSA and I don’t know how it worked.
hi, sorry to tag onto this thread but really need advice & new to the forum so hello. I have an Audi A4 cabriolet (2008), I have had loads of problems recently, latest being dpf - I had it removed & chemically cleaned, local mechanic then reassembled & put a new pressure sensor, connected laptop to car & told it that dpf had been replaced, yet still dpf light comes on as soon as you put car in car, I have taken car on motorway to try a regen but not worked (drove in low gear & normal for 15-20 mins). 1st showed as error code P242F. but that has been cleared now & no fault codes are showing, yet still amber dpf light. any help appreciated. thanks Harry
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