VW Emissions Fix

[Hendry]

Just had a letter in from VW advising me they now have a fix for the emissions cheat software installed for the NOx figures on the EA189 Diesel engine in my 2.0 CR TDi Jetta.

 

Does anyone know what the "fix" actually is? The letter doesn't give any clues as to what it actually involves, googling suggests no actual mechanical fix on 1.2 and 2.0 TDis, seemingly just the 1.6 which needs mechanical rework, but also states the earlier 2.0 CR TDi was one of the last to get a fix as VW took ages to figure out how to do it as it wasn't as easy a fix as later 2.0 TDis which only needed a simple software update.

[buckbuckbuckie]

Who the fuck gets post at 5 in the morning?

[New POD]

Are you happy with the performance and economy of said VW ?  If Yes, then wait.

Wait until you start hearing reports of Lack Lustre Performance and Poor economy.

The only fix will be "recalibration" of the engine's map.

 

Alternatively, go to a rolling road, get the before fix performance checked out. Get Fix, and then  take it back and see what the performance is.

 

Then sue VW in small claims for loss of performance.

[fordperv]

They will no doubt cripple it by flashing the ecu with a different map

[Pillock]

Just ignore it, there's no benefit to you of having it done. They just have to offer it to everyone.

[lisbon_road]

My understanding is something like this.  If you know better, please post here.

 

Later engines with an adblue system can be improved relatively easily as they change the programme to use more adblue at appropriate times.  Presumably the loss of efficiency with these is relatively small, if anything.

 

Older engines with the NOX trap type system are much more difficult to correct as the system is fundamentally not as good.  As it works by holding NOX and periodically running rich to create a reducing environment in which the NOX is reduced, there is a more significant loss of efficiency as they run rich more often than they did before modification.

 

Because the earlier systems didn't work very well, I have read various things about flow straighteners and so on.

 

Can anyone who knows more correct this?

[Pillock]

Be interesting if true, surely if it's running rich more often then fuel economy will suffer?

My Focus that had an adblue-style system used to do regen which I guess is the same as running really really rich - just gets the exhaust temp right up. I could tell when it was doing it more often as average consumption dropped from mid-50s to high-40s.

[Guest Lord Sward]

Don't get it done.

[Dave_Q]

This is the closest I can get to any technical details: https://www.google.co.uk/url?sa=t&source=web&rct=j&url=http://www.polcms.europarl.europa.eu/cmsdata/upload/93acc4d2-6066-46c2-b159-2e39460d7100/20160713-Volkswagen-replies.pdf&ved=0ahUKEwiy6cDP7_rQAhWsLsAKHUpqCWcQFghmMAc&usg=AFQjCNGBbOqNiVhmckIy7fnudHIFYBCyUw&sig2=DkkSzzhC9s-uAskYLys1ow

 

Basically NOx is the problem, it sounds like they are whacking up the EGR rate at certain times (part load, low revs) and recalibrating the injectors to do an extra squirt or something to ensure that the PM emissions don't go up - NOx and PM are on a sort of trade off curve where one goes up as the other goes down - NOx is more at higher combustion temps whereas PM is less. EGR cools the combustion temperature hence less NOx and more PM unless you are regulating the PM in some other way like a DPF.

 

In unrelated* news: http://www.honestjohn.co.uk/news/volkswagen-emissions-scandal/8-reports-of-volkswagen-tiguans-losing-power-after-ea189-emissions-fix/

 

If it was my car, I probably wouldn't. Soz polar bears.

[Dick Cheeseburger]

OP, there's a fred on here already to do with this. Search around a bit. Mrs TW has an 8 year old VAG TDI and we've had letters slowly dropping for the last 12 months. You should have had a letter mentioning modified air intake as well. Her car pulls like a train, and we have no intention of taking it into VAG and asking them to make it slower. Remember, there's no obligation to actually take them up on their kind* offer.

[billyboy406v6]

Would you trust a company with VWs reputation to fix your car ?

[conkerman]

It's a remap which trades increased CO2 for reduced NOX. What concerns me is that doing this increases the loading on the DPF. And for that reason VW can get to fuck. My car has been great for 90k miles, cocking about with it now without any guarantees is a no no for me. YMMV though.

 

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[conkerman]

ETA. The above is for the 2 litre.

The 1.6 gets an 'airflow modifier' to increase the accuracy of the air metering system. This will probably be allied to a remap. The airflow modifier looks like the grid from a chip cutter.

 

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[Dick Cheeseburger]

It's a remap which trades increased CO2 for reduced NOX. What concerns me is that doing this increases the loading on the DPF. And for that reason VW can get to fuck. My car has been great for 90k miles, cocking about with it now without any guarantees is a no no for me. YMMV though.

Sent from my Vodafone Smart ultra 6 using Tapatalk

Interesting reading. How is the load on the DeePeeEff increased though?

[Formula Autos]

Fatha FA has recently had a letter about his Seat Exeo 2.0 dizzler "needing" re-calibrating by the dealer under warranty. Despite me explaining to him that this was on the back of all that emissions malarkey that was in the news, and advising him to wait, he took it in and had this done. Having driven the car before and after, my impression is that the performance is noticeably worse afterwards, with less oomph available for overtaking. Fuel economy seems unaffected, mind.

[conkerman]

NOC is formed when peak combustion temperatures exceed a threshold temperature. Post injection strategies to inject further fuel after the main combustion event reduces this temperature as the fuel acts as a heat sink. This "extra' fuel may not be fully combusted and increase DPF loading.

The DPF on the vehicle was specced for the standard map which makes less particulates.

 

Hope this makes sense,

 

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[Pillock]

Interesting reading. How is the load on the DeePeeEff increased though?

 

 

Assuming DaveQ is right....

 

Basically NOx is the problem, it sounds like they are whacking up the EGR rate at certain times (part load, low revs) and recalibrating the injectors to do an extra squirt or something to ensure that the PM emissions don't go up - NOx and PM are on a sort of trade off curve where one goes up as the other goes down - NOx is more at higher combustion temps whereas PM is less. EGR cools the combustion temperature hence less NOx and more PM unless you are regulating the PM in some other way like a DPF.

 

Less NOx means more Particulates, and Particulates is what the DPF traps so you'll be asking it to work harder.

[Dick Cheeseburger]

NOC is formed when peak combustion temperatures exceed a threshold temperature. Post injection strategies to inject further fuel after the main combustion event reduces this temperature as the fuel acts as a heat sink. This "extra' fuel may not be fully combusted and increase DPF loading.

The DPF on the vehicle was specced for the standard map which makes less particulates.

Hope this makes sense,

Sent from my Vodafone Smart ultra 6 using Tapatalk

My understanding is basically, the new map is like too many pies when running a standard human heart. Aye?

[conkerman]

The normal way to combat NOX is to use EGR, but I would not imagine there being enough spare capacity in the EGR system for this.

 

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[I_am_Diesel]

I took Mrs Diesel's 2.0 GTD Golf in after they sent the second letter saying it needed doing. It took about an hour to do but they weren't very forthcoming in telling me what the actual fix was. On the plus side they gave me a goody box which I didn't tell her about. I have wrapped it as a Christmas gift for her.

[Cavcraft]

As a Vauxhall apologist, all this is music to my ears.

 

AVAGAS. 

[SiC]

I wonder when all these VAG diesels will loose more depreciation because of this. They might just be worth what they actually should be worth, rather than the German diesel premium.

 

Also it's bloody hard finding newer than 5 year old cars that are petrol and not small cars.

[overrun]

How was the letter worded? I want to see how they phrased "You know the emissions that we cheated on, lied to our customers and were forced by law to change?..."

[Pillock]

Five quid there's a positive spin on it.... "We've found out your car needs a rework to make it EVEN BETTERER"

[UltraWomble]

Mother Womble got the letter - did the sensible thing and filed it in the recycling bin.

[conkerman]

I'll see if I can find one.

 

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[Guest Lord Sward]

I could relay all kinds of tales about this issue, but I'm legally GAGGED.

[Pillock]

PM me the tales and I'll present them as my own opinions on the matter, you're in the clear then.

[DodgeRover]

Get yourself elected as an MP and tell us all with parliamentary privilidge

[Guest Lord Sward]

The Stasie are watching and listening to my every move.  And my MP drives VAG.  No chance - they're definitely all out to get me.