EGR should we all be more concerned

[gregozedobe]

Also someone suggested cleaning method - driving in 3 gear at 100-110km/h for 30 km.

I'm curious, what is the theory behind that ie how is that supposed to remove the gunk ?

[Greg Roles]

High sustained rev's, engine runs hot, trying to suck more in?

I'd go the injection / physical clean route personally.....

[chisler]

could the intake manifold be used as a sludge indicator?
I ask cause it does seem like the easiest part to get to.
or is it possible for the intake manifold to be clean and all the other pipes and stuff dirty?

[bluey]

Wondering about the design of CCV separators in various models. I read on Mann and Hummel's web site I think about how they do OEM design of CCV separators that are integrated into plastic rocker covers for VW.

So I was wondering if older models without such integrated CCV separators are more of problem for gunking than newer models.

[Greg Roles]

The oil separation has improved in line with compression and power output, as it should. Higher compression, higher mean effective pressure per explosion, more blowby, more crankcase pressure. I'd reckon they are all pretty similar, it's just the 1.9 has been round longer, more higher milage units out there, more showing sludge problems. The good news for you is "TDI club" has plenty on info on using Vag Com to diminish the EGR in the 1.9 to next to nothing, solving the sludge problem. Not so as yet for the 2.0. Go look at their site mate!

[Greg Roles]

could the intake manifold be used as a sludge indicator?
I ask cause it does seem like the easiest part to get to.
or is it possible for the intake manifold to be clean and all the other pipes and stuff dirty?

Ignore the white dots, erasing other labels. Sludgeville is outlined in yellow, but includes inlet ports in the head.

[GoLfMan]

The oil separation has improved in line with compression and power output, as it should. Higher compression, higher mean effective pressure per explosion, more blowby, more crankcase pressure. I'd reckon they are all pretty similar, it's just the 1.9 has been round longer, more higher milage units out there, more showing sludge problems. The good news for you is "TDI club" has plenty on info on using Vag Com to diminish the EGR in the 1.9 to next to nothing, solving the sludge problem. Not so as yet for the 2.0. Go look at their site mate!

thats great news. Does this mean a Provent does NOT need to be installed?

[Greg Roles]

Mate, if I had your engine, I'd Vag com down the EGR, and keep an eye on things. You'll still get stock levels of oil vapor going through the engine, but little to no exhaust to mix with it to form the sludge. In short, probably no need for a Provent. Search on TDI club, lots of info on this, how to etc etc.

[Greg Roles]

"race pipe" from Allard, EGR and flap delete, but will throw an error light because of reduced EGR flow. A sexy item all the same.

http://forums.tdiclub.com/showthread...rning+down+egr

A link to turning down the 1.9 using vag com..... section 7h. Lots of power up tips for you 1.9 guys in the FAQ too.

http://forums.tdiclub.com/showthread...rning+down+egr

I also have read about an "intercooler filter" in the 1.9, and this can block up and become a restriction. Something else to investigate little oilers! May be a US only thing.

[Buller_Scott]

cheers cog.

i've seen some literature on turning down egr with vag com- that wouldnt forfeit any of the "runaway safetys" of the engine, would it? it sorta makes sense that it might.

also, seeing as egr assists in the warming up process, would this also be forfeited? or is that just if you block off egr completely?

as for the intercooler filter- is that what countless mk4 tdi'ers refer to as the "snow screen"?