Have you checked for oil leaks? The most common leaking problem; is the valve cover gasket or cam, chain tensioner gaskets, seals.


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Check for an exhaust leak. Also, try putting on recirc and see if it stops.

 

exhaust leak

yea check for exhaust leaks ,but also check the A/C moisture drain it's suppose to be covered with a heat shield but it could be exposed. Gotta go under the car to see it, passenger side half way up on the firewall.

 

Crankcase breather hose was the issue. Apparently they are well known for going. VW didnt make them with an oil resistant inner coating, so they just start to crumble. £41 for the single hose from the dealer or, £14.79 inc delivery from an OEM supplier in China via Ebay for all three. Ebay it is!

 

I'm assuming you are in the UK? These rubber stock hoses; just DO NOT last, in this particular application. I recommend you get a silicone aftermarket hose; for this particular failure prone hose, the silicone hose will last forever. Here in the USA; there is 034 Motorsports but in the UK Creations Motorsport, makes a similar hose. I would contact the vendor you choose; to see which specific hose, would fit your particular 1.8T. The silicone hoses may cost more; than cheaper rubber hoses but their durability, make it the last time... you will ever have to replace it!

creations motorsports: crankcase breather hose

Silicone Crankcase Breather Hose AUM AUQ

Product Price : £ 26.99

VW Jeta/Bora/Golf MK4 » CreationsMotorsport

034 Motorsports; breather hose: $38.50

Breather Hose, Valve Cover, MkIV Volkswagen 1.8T, Early AWP
Part Number: 034-101-3040

Breather Hose, Valve Cover, MkIV Volkswagen 1.8T, Late AWP
Part Number: 034-101-3041

https://www.google.com/webhp?source...urceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=034 motorsports breather hose kit