DID IT! sprayed a can of throttle body/ carby cleaner into the egr/manifold....

[Von Richthofen]

2007 PD no DPF so that part of the treatment doesn't worry me...... but I can understand the concern in later models.

[GoLfMan]

I'll be doing this at my next major service interval! I'll take the manifold off though I think (since its the timing belt service... OUCH)

[benough]

That's because it's bound to!

How convinced are you it's going to harm the DPF?

I really wanna have mine cleaned out a bit but obviously don't want to harm the DPF.

[gtimk5]

Ben, I havent heard of any dramas caused by doing this yet. The Wynns product was developed in Europe where the deisel market is 50%.
Of course there will be some that are very opposed to this maintenance job, and noone is making them do it.
I have done approximately 40-50 diesels now with no negative response from customers and also without any problems.
I would rather a clean intake than one full of caked up gunk. Driveability is enhanced as is fuel economy.
Andrew

[benough]

Thanks Andrew.

Even on TDI's with a DPF?

I figured it wouldn't kill it but want to be sure.

I consistently asked VW about maintaining it and they keep palming me off. Maybe they want to make money of EGR valves.

[noone]

Wow, I cant understand how the piping can get so clogged with soot and carbon and this is normal or to be expected? Sounds like they need another filter in the mix, one that is replaced every service.

[benough]

I was originally told that it was because Australia wasn't using the grade of diesel Europe was but we have had that grade since 2008. I hope my EGR doesn't look like that! (Probably does)

[Greg Roles]

ANY oil burnt in the engine will produce some level of oil ash. VW themselves state that it is oil ash that eventually permantly clogs the DPF, as it can't be burnt off. Do what you will, I doubt one clean would kill a DPF, but I am convinced it will add some extra ash to your DPF. I wouldn't be doing it personally, but so too if you can't take it apart to have it cleaned once every 100k or so, then it wouldn't be a bad idea. There is a definate buildup happening, and it's robbing you of airflow and thus power and economy, not to mention gumming up expensive to replace EGR valves and flaps. Choose your poison!

[gtimk5]

Thanks Andrew.

Even on TDI's with a DPF?

I figured it wouldn't kill it but want to be sure.

I consistently asked VW about maintaining it and they keep palming me off. Maybe they want to make money of EGR valves.

Hey Ben, the local dealer is doing the clean every 15,000 kms here. Other problem brand dealers here are definately doing the clean. They have seen exactly as in the pics there, by the way, those pics are not of a VW. If the maniflod got to that stage, for sure, rubblish would travel further.
Lets call it preventative maintenance? By doing this every 15,000 there will not be buildup down the track.
Yes, I do it on all my later model deisel customers vehicles, DPF or not. My Caddy is an 07 model so it doesnt have the later setup.
At a diesel course last monday night, we learnt that just about all the different brand diesels are a compromise and are constantly being developed to improve all the issues.
There are a lot of problems to come in the future with the management of the diesels, bw warned, keep those filters replaced and use a good quality fuel!!
Cheers, Andrew

[vampie.boy]

Hi,

Read with interest!

I am not sure i would want to go down this road unless there is a noticeable loss of power and evidence of a significant buldup of crud in the EGR / intake manifold.

The other solution is fitting an allard EGR delete kit, but this is likely to bring the CEL on the latter TDI s and AFAIK the only way aroud this is to remap engine ECU.

There is also this;

TDI FAQ

which may be worth considering if one decided to go down the route of cleaning and wanted to limit the further buildup in the inlet maniforld after cleaning.

Contrary to the ross-tech site, it is possible to do this to the PD s that have the EDC15 style controller (no lambda probe), but the values for the offset would be different.

I am none the wiser whether it is worth it or not, but the evidence appears to be that the clogging is not as big problem in latter PDs as it is with the non PD engines in Europe.