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That annoying diaphragm breather thing


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So, whilst perusing the engine bay, I noticed this is looking a little worse for wear, probably from the amount of times I swap my airbox for a cone filter and back again.

 

Can I just bin it off and vent to atmosphere? Or do I need some sort of weird catch tank set up?

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  • 4 weeks later...

I replaced my faulty PCV with a catch can, but then ditched that and went back to the PCV. Therefore I'd recommend replacing the PCV with a new one - it will probably outlive the car and doesn't have to be periodically emptied. It's also the way VW intended your car to be, and there's no performance upgrade to be gained from the catch can.

 

If you're venting to atmosphere / using a catch can (with no breather) then I think you need to block the skinny breather pipe going into the top of the PCV or you'll get a rough idle. No idea what impact it has on MOT, but my advice is buy a new PCV if possible.

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