EGR and Adblue delete

[Ayjay]

At the risk of contradicting my much more learned friend (aka @Bav), they don't always take time to register adblue refills - after I fill up (the max recommended less a couple litres - Bav is spot on there), I switch on and then wait 30 seconds before starting the engine and it always goes back up to 6000 or 6500. Mind you, in the past, that didn't stop the bloody thing from giving the dreaded 650 mile warning and adblue orange engine light - I recently had some remedial work done by VW which I'm hoping will have sorted that (but time will tell). @Howzat is also correct about booking in and cancelling if necessary but in my personal experience the warnings have taken anything between 100 and 350 to clear - they always have so far but it can still seem like a game of chicken.

 

[Bav]

At the risk of contradicting my much more learned friend (aka @Bav), they don't always take time to register adblue refills - after I fill up (the max recommended less a couple litres - Bav is spot on there), I switch on and then wait 30 seconds before starting the engine and it always goes back up to 6000 or 6500.

I don't think we're in disagreement mate - it can take a while to register, but it doesn't always.

 

[Alvaro.G]

Hello,

I have a Multivan T6 2.0 BiTDI 199hp 4Motion with 165k kilometers on it (engine code CXEC), and I'm considering an EGR valve delete. I've been advised that in addition to the software change, I should mechanically block it with a blanking plate to prevent hot gases from damaging the cooler.

However, I've also been told that deleting the EGR could be bad for the DPF (Diesel Particulate Filter), as it might cause more soot to build up prematurely. Right now, my DPF has an oil ash saturation of 67% and regenerates every 250 km.

Is it true that deleting the EGR speeds up DPF blockage? If so, what are the solutions to prevent this?

 

[Bav]

Hola,

Tengo una Multivan T6 2.0 BiTDI de 199 CV 4Motion con 165.000 kilómetros (código de motor CXEC ) y estoy considerando eliminar la válvula EGR . Me han recomendado que, además del cambio de software, la bloquee mecánicamente con una placa de obturación para evitar que los gases calientes dañen el enfriador.

Sin embargo, también me han dicho que eliminar la EGR podría ser perjudicial para el DPF (filtro de partículas diésel), ya que podría provocar una mayor acumulación de hollín prematuramente. Actualmente, mi DPF tiene una saturación de cenizas de aceite del 67 % y se regenera cada 250 km .

Por el momento no tengo pensado quitar el DPF ni el AdBlue.

Por el momento no tengo pensado quitar el DPF ni el AdBlue .

¿Crees que eliminar la EGR es una buena opción? ¿Es necesario instalar la placa ciega? ¿Alargará la vida útil del DPF ?

Please post in English - Gracias

 

[DXX]

Hello,

I have a Multivan T6 2.0 BiTDI 199hp 4Motion with 165k kilometers on it (engine code CXEC), and I'm considering an EGR valve delete. I've been advised that in addition to the software change, I should mechanically block it with a blanking plate to prevent hot gases from damaging the cooler.

However, I've also been told that deleting the EGR could be bad for the DPF (Diesel Particulate Filter), as it might cause more soot to build up prematurely. Right now, my DPF has an oil ash saturation of 67% and regenerates every 250 km.

Is it true that deleting the EGR speeds up DPF blockage? If so, what are the solutions to prevent this?

Use 2 blanking plates; inlet and outlet to the EGR.
DPF is not affected but will continue to degrade as the soot is converted to ash.
If anything the higher (better) cylinder temperatures will result in less soot being formed as combustion will be better.

 

[Bigsidavies]

I’ve done probably 30k miles since my egr delete on a 204 Cxeb. Regens still the same mileage intervals and no issues (that I know of) yet.
Edit:- my van is on approx 240k km fyi @Alvaro.G

 

[SlothBurger]

I went back the other way as from today. EGR and AdBlue back in place. I had EGR blanked and mapped out a couple months back and AdBlue mapped out. DPF was left in. I saw that regens started happening more frequently. They went from approx 250km to less than 120km to the point where I was getting 4-5 regens per tank or more even with mostly longer journeys above 1 hour. I know this is still within norms but it was a pain in the ass having to watch out all the time and driving extra to let the regens complete. Also my DPF ash residue was already high but climbing with each drive and regen. I've now had the EGR cooler and pipe replaced. AdBlue put back in place. The DPF was taken off and cleaned. Current situation in screenshot below from the DPF Monitor app. Van feels like it running smoother now so far in comparison to before. Will see how it goes.

 

[Alvaro.G]

I went back the other way as from today. EGR and AdBlue back in place. I had EGR blanked and mapped out a couple months back and AdBlue mapped out. DPF was left in. I saw that regens started happening more frequently. They went from approx 250km to less than 120km to the point where I was getting 4-5 regens per tank or more even with mostly longer journeys above 1 hour. I know this is still within norms but it was a pain in the ass having to watch out all the time and driving extra to let the regens complete. Also my DPF ash residue was already high but climbing with each drive and regen. I've now had the EGR cooler and pipe replaced. AdBlue put back in place. The DPF was taken off and cleaned. Current situation in screenshot below from the DPF Monitor app. Van feels like it running smoother now so far in comparison to before. Will see how it goes.


View attachment 301331

Hey, did you install the plates to block the EGR gases?v

 

[Alvaro.G]

"I'm a bit lost with all the conflicting opinions; some people say it works well, others say it doesn't. My main reason for wanting to delete the EGR is to prevent the intake manifolds from getting clogged. I've already had to clean the EGR twice, and there's a lot of oily residue. But, if doing this is going to negatively affect the DPF and increase the frequency of regenerations, I won't do it. I have no intention of deleting the AdBlue system, unlike the other person. Right now, it's doing a DPF regeneration every 250 km, which seems like a very short interval to me."

 

[Bigsidavies]

Hey, did you install the plates to block the EGR gases?v

I did.

 

[Fat Keif]

Hi, Yes Bav, the limp mode I was referring to is the situation where the engine will simply refuse to start at all due to recognising lack of AdBlue, or it will be rough and unsuitable to drive properly. And point taken - I will not fill it to the max next time.
It is booked for next week, but I wanted more than just my opinion on this as I have more to tell.
Back in February, I was on my way to the Austrian alps. Driving through Luxembourg the amber engine symbol light came on, and my heart sunk. I immediately stopped on the motorway, looked online for any info and called a mate in England for advice. As he didn't have anything to offer I looked up the nearest VW dealer and went straight in. After booking it and having a thorough inspection, the technician came out and told me that there is nothing to worry about - its probably about cheap AdBlue I have in the system. They have cleared the fault code and I should be on my merry way. The previous day I, following a message on my dashboard topped it up with about 5 litres AdBlue bought from Tesco. This was back then in February. And at about 6000 miles later (well 21 Aug) the message for more AdBlue needed came on again. Ok, I perhaps overfilled it with 10 litres instead of less (this time not from Tesco) , but a gut feeling is telling me that it uses the AdBlue at a faster rate than it should, and this is t be investigated. There also may be another issue, like a sensor or else .. In Feb, the light came on the following day, when it was full - and about driving 350 - 400 miles post filling it. This time light came on a day or two and about 200 miles post filling it.
Now I still have about a 1000 miles until the AdBlue runs completely out - or so it says the old message and it counts down to zero, whilst the AdBlue tank is full.
Yes I've driven it about 200 miles since I first posted this on the forum, hoping that it will clear by itself, but it doesn't. The light is still on, so we are booked for next week. Feel free to share your thoughts ..

 

[T6 Syd]

I went back the other way as from today. EGR and AdBlue back in place. I had EGR blanked and mapped out a couple months back and AdBlue mapped out. DPF was left in. I saw that regens started happening more frequently. They went from approx 250km to less than 120km to the point where I was getting 4-5 regens per tank or more even with mostly longer journeys above 1 hour. I know this is still within norms but it was a pain in the ass having to watch out all the time and driving extra to let the regens complete. Also my DPF ash residue was already high but climbing with each drive and regen. I've now had the EGR cooler and pipe replaced. AdBlue put back in place. The DPF was taken off and cleaned. Current situation in screenshot below from the DPF Monitor app. Van feels like it running smoother now so far in comparison to before. Will see how it goes.


View attachment 301331

Hi, interested whether there were any issues with the Adblue pipes, injector or sensors when you had it reconnected - I appreciate it was only sitting there unused for a couple of months. Also, where you say you had the EGR cooler and pipes replaced, did that include the EGR valve as well?

Thinking of having my deletes reversed, but wondering whether I'll have to replace the parts that have sat there unused for over a year.

Thanks.

 

[Bav]

Hi, Yes Bav, the limp mode I was referring to is the situation where the engine will simply refuse to start at all due to recognising lack of AdBlue, or it will be rough and unsuitable to drive properly. And point taken - I will not fill it to the max next time.
It is booked for next week, but I wanted more than just my opinion on this as I have more to tell.
Back in February, I was on my way to the Austrian alps. Driving through Luxembourg the amber engine symbol light came on, and my heart sunk. I immediately stopped on the motorway, looked online for any info and called a mate in England for advice. As he didn't have anything to offer I looked up the nearest VW dealer and went straight in. After booking it and having a thorough inspection, the technician came out and told me that there is nothing to worry about - its probably about cheap AdBlue I have in the system. They have cleared the fault code and I should be on my merry way. The previous day I, following a message on my dashboard topped it up with about 5 litres AdBlue bought from Tesco. This was back then in February. And at about 6000 miles later (well 21 Aug) the message for more AdBlue needed came on again. Ok, I perhaps overfilled it with 10 litres instead of less (this time not from Tesco) , but a gut feeling is telling me that it uses the AdBlue at a faster rate than it should, and this is t be investigated. There also may be another issue, like a sensor or else .. In Feb, the light came on the following day, when it was full - and about driving 350 - 400 miles post filling it. This time light came on a day or two and about 200 miles post filling it.
Now I still have about a 1000 miles until the AdBlue runs completely out - or so it says the old message and it counts down to zero, whilst the AdBlue tank is full.
Yes I've driven it about 200 miles since I first posted this on the forum, hoping that it will clear by itself, but it doesn't. The light is still on, so we are booked for next week. Feel free to share your thoughts ..

My first thought is that there's no such thing as poor quality adblue - it's a set ratio of 1 part urea to 2 parts de-mineralised water and any variance from that formula would result in something that could not be marketed as adblue.

That would seem to bring into question the veracity of the advice you were given by the dealer, though, tbf, there could have been a language issue and they were actually referring to your adblue having crystallised (perhaps, maybe?).

Either way, I wouldn't risk running your adblue range down to zero - it may magically update of its own accord or it may not.

 

[SlothBurger]

Hi, interested whether there were any issues with the Adblue pipes, injector or sensors when you had it reconnected - I appreciate it was only sitting there unused for a couple of months. Also, where you say you had the EGR cooler and pipes replaced, did that include the EGR valve as well?

Thinking of having my deletes reversed, but wondering whether I'll have to replace the parts that have sat there unused for over a year.

Thanks.

So far no issues with adblue pipes or injectors. Regens are now approx. every 300km or approx. 180 mins of driving. That's up from appox. 150km or 120 mins of driving. Van is running much smoother. The EGR front pipe & EGR cooler were replaced. Also the DPF was cleaned. Not sure if there's a separate valve as if it was replaced it must have been part of the cooler as no separate charge for valve. Both mappings were reversed/removed & put back to normal. I did put an additive into the adblue tank when it was initially mapped out to prevent crystalisation. These additives could be snakeoil but I thought I'd try it to stop any further issues if I did reverse in future which I've now done that.

 

[Sasquatch]

My first thought is that there's no such thing as poor quality adblue

Absolutely. "AdBlue" is the trademark name for a simple but very specific formula. If it doesn't meet the spec it cant legally be called adblue.

Storage is key. From a garage forecourt where it's been set outside on display in the blazing sun for weeks is not a good source, no matter how cheaply it may be sold.

 

[VR#46GOAT]

Hi, Yes Bav, the limp mode I was referring to is the situation where the engine will simply refuse to start at all due to recognising lack of AdBlue, or it will be rough and unsuitable to drive properly. And point taken - I will not fill it to the max next time.
It is booked for next week, but I wanted more than just my opinion on this as I have more to tell.
Back in February, I was on my way to the Austrian alps. Driving through Luxembourg the amber engine symbol light came on, and my heart sunk. I immediately stopped on the motorway, looked online for any info and called a mate in England for advice. As he didn't have anything to offer I looked up the nearest VW dealer and went straight in. After booking it and having a thorough inspection, the technician came out and told me that there is nothing to worry about - its probably about cheap AdBlue I have in the system. They have cleared the fault code and I should be on my merry way. The previous day I, following a message on my dashboard topped it up with about 5 litres AdBlue bought from Tesco. This was back then in February. And at about 6000 miles later (well 21 Aug) the message for more AdBlue needed came on again. Ok, I perhaps overfilled it with 10 litres instead of less (this time not from Tesco) , but a gut feeling is telling me that it uses the AdBlue at a faster rate than it should, and this is t be investigated. There also may be another issue, like a sensor or else .. In Feb, the light came on the following day, when it was full - and about driving 350 - 400 miles post filling it. This time light came on a day or two and about 200 miles post filling it.
Now I still have about a 1000 miles until the AdBlue runs completely out - or so it says the old message and it counts down to zero, whilst the AdBlue tank is full.
Yes I've driven it about 200 miles since I first posted this on the forum, hoping that it will clear by itself, but it doesn't. The light is still on, so we are booked for next week. Feel free to share your thoughts ..

Hi, I have had exactly the same issue with my

Hi, Yes Bav, the limp mode I was referring to is the situation where the engine will simply refuse to start at all due to recognising lack of AdBlue, or it will be rough and unsuitable to drive properly. And point taken - I will not fill it to the max next time.
It is booked for next week, but I wanted more than just my opinion on this as I have more to tell.
Back in February, I was on my way to the Austrian alps. Driving through Luxembourg the amber engine symbol light came on, and my heart sunk. I immediately stopped on the motorway, looked online for any info and called a mate in England for advice. As he didn't have anything to offer I looked up the nearest VW dealer and went straight in. After booking it and having a thorough inspection, the technician came out and told me that there is nothing to worry about - its probably about cheap AdBlue I have in the system. They have cleared the fault code and I should be on my merry way. The previous day I, following a message on my dashboard topped it up with about 5 litres AdBlue bought from Tesco. This was back then in February. And at about 6000 miles later (well 21 Aug) the message for more AdBlue needed came on again. Ok, I perhaps overfilled it with 10 litres instead of less (this time not from Tesco) , but a gut feeling is telling me that it uses the AdBlue at a faster rate than it should, and this is t be investigated. There also may be another issue, like a sensor or else .. In Feb, the light came on the following day, when it was full - and about driving 350 - 400 miles post filling it. This time light came on a day or two and about 200 miles post filling it.
Now I still have about a 1000 miles until the AdBlue runs completely out - or so it says the old message and it counts down to zero, whilst the AdBlue tank is full.
Yes I've driven it about 200 miles since I first posted this on the forum, hoping that it will clear by itself, but it doesn't. The light is still on, so we are booked for next week. Feel free to share your thoughts ..

Hiya, did you get to the bottom of your AdBlue issue? I have had exactly the same. Led me to have the EGR and Adblue deleted which has subsequently created a host of issues with injectors, DPF and Turbo over pressurising... all within 1000 miles.

 

[VR#46GOAT]

I’ve done probably 30k miles since my egr delete on a 204 Cxeb. Regens still the same mileage intervals and no issues (that I know of) yet.
Edit:- my van is on approx 240k km fyi @Alvaro.G

Hi, did you have blanking plates fitted?

 

[VR#46GOAT]

Hello,

I have a Multivan T6 2.0 BiTDI 199hp 4Motion with 165k kilometers on it (engine code CXEC), and I'm considering an EGR valve delete. I've been advised that in addition to the software change, I should mechanically block it with a blanking plate to prevent hot gases from damaging the cooler.

However, I've also been told that deleting the EGR could be bad for the DPF (Diesel Particulate Filter), as it might cause more soot to build up prematurely. Right now, my DPF has an oil ash saturation of 67% and regenerates every 250 km.

Is it true that deleting the EGR speeds up DPF blockage? If so, what are the solutions to prevent this?

Hi, Did you get a comprehensive answer to your questions. I have the same question, concerns and have the same engine as you. Thanks

 

[Bigsidavies]

Hi, did you have blanking plates fitted?

Yes. Essential as your old EGR valve may be dirty enough not to shut completely even when coded out.

 

[Cog Head]

Best place for them is on the garage floor…
It’s a bit of a job to completely remove the entire system, Darkside dev provide a physical delete kit.
Mine has been good as gold since is disappeared.
Smoother and economy went up a bit too