Man i don't know, ELSA Web (what techs have) doesn't even say anything about a PCV valve, but i do know fora fact thats what the valve is, and the dealer can identify it on ETKA if you point it out on the picture to them.

 

Its called a pressure regulating valve in the Bentley manual...go to Repair Manuals then to Fuel Injection & Ignition, then 2.7 engine codes, then Multi Port Fuel Injection, then Vacuum Sys. Layout, then to Crankcase Ventilation.

 

I am going to talk to the dealer tonight and find out what its named and buy it. My car did the smoking thing again, so I pulled the dip stick to confirm. Wow, thats alot od pressure that builds up, I can definately see how that could blow the seals if you left it that way, I`d say there had to be 10-20 lbs pressure, hard to say really, but it did cause a good hiss of air and `splurt`of oil. Had to drive the car, so I left the dipstick slightly out, hoping the part with thaw out for the drive home. Either way, I shall get the name of the part from Audi tonight.

 

Indeed, Bentley (ElsaWin) refers to the unit as “pressure regulating valve” - drawing A24-0174 (correctly stated by AdLucem).
For my surprise there is a drawing A24-0175- Suction jet pump (automatic transmission).
The 3-way pump is the one from the AudiWorld article. (My dealer suggested there is no Suction jet pump on 2.7 engines, but only on 1.8).

Etka has a drawing and part # for the suction pump (listed for manual transmission); the pressure regulating valve is shown on the global vacuum diagram, but w/o part#. (Part# only for the breather hose connected to the valve),.

Any way for troubleshooting the Crankcase ventilation system, and specifically the pressure valve and suction pump?
Any practical experience around the vacuum system and related components?

( There are indications for vacuum system applications used in normal and for cold climate. (It seems to me moving cars among climate zones could be a tricky thing to do).

 

Had same problem yesterday on my '01 A6-2.7t Automatic. 7 degrees F when started car in the morning. Lots of smoke until shut car down for around 5 minutes and then no smoke afterwards. Oil dripping from tailpipes, but no more smoke. Sounds like similar problem as one posted on AudiWorld that described a blocked or frozen breather hose. Appears to be a common problem in cold weather. The part that I think I need is078 103 235 G.

 

078 103 235 G
what is the price for it?

This should be the breather hose with pressure regulating valve (as an unit).
Dealer will send me a schematics.

Still there is a confusion with the suction pump...

 

Nice photo!!!


078 103 235 G

is the part # for 1998 application

there are also R, N, J as per year (engine) and climate usage.

What does that part actually do?

Isn't it posible to clean/wash it carefully?
(The price tad is quite high)

 

OOOOHHH good picture! Thats exactly what you need. As for the suction jet pump the 2.7T isn't equipped with them, at least i've never found one on the engine before and i've taken out a LOT of 2.7T engines.

 

Yep, that is the part and the correct part number. There are actually 2 different part numbers based on the serial number split, but only the letter at the end changes.

The dealer I talked to said that they have never ordered one of these, nor replaced one, and I am in Canada. So its not a part that generally goes. Its likely that moisture got in it and can't properly escape. I may attempt to take mine off and clean it if that is the case. The part is listed at $205.00 ($CND) here.

I dunno about the parts guy here, very helpful, but not very knowlegable. I had to send him to see a mechanic to confirm this 'aparatus' is what Audi is calling a PCV valve, and that was after identifying the part myself on the exploded diagrams.

 

Suction pump for 2.7:

078 133 701 P (AD) - as per VIN