Crancase Breather Valve problem ??

**firdausasri** · 14-09-2009, 02:53 PM

My friends made a shocking discovery that stock Crankcase Breather Valve part # 034129101A has failed on their rides. True enough, upon taking out the engine cover, mine too soon going to heaven!

http://1.bp.blogspot.com/_uX7E74a-4e...6_stockcbv.JPG

At the moment, we’re playing guessing game that the one fitted on Audi B5 A4 1.8T to be more reliable, part # 034129101B. Anybody having the same problem?

**noone** · 14-09-2009, 04:26 PM

Can you please aducate us less educated but interested parties.

- What is it / What it does
- Which unit is it in your pic?

**Catfish** · 14-09-2009, 04:35 PM

It's the round black vetical thing dead centre in the picture. It opens to direct crankcase oil fumes into the inlet system before the turbo, rather than venting to the atmosphere - part of the emission control system that all cars now have to have.

**Catfish** · 14-09-2009, 04:42 PM

Also, from memory Plautos has eliminated this valve and has his crankcase breather plumbed into the exhaust system beyond the cat to prevent oil fumes going through the turbo ...........................

**firdausasri** · 14-09-2009, 05:00 PM

Catfish sums it up well, I couldn't explain any better. At the moment, I could only pint point one thing :- stock breather valve can't cope with increased boost pressure caused by chipping.

Bypassing this valve would be great