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Is pressurised air from oil filler on 1.8T normal?

Discussion in 'A4/S4 forum(B5 Chassis)' started by Blue_Thunder, Mar 13, 2010.

  1. Blue_Thunder
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    Blue_Thunder Active Member

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    [Mar 13, 2010]
    My sister's bloke has just bought himself a hairdresser's car, a B6 cabrio with a 1.8T. I assume this is the same 1.8T as the B5??

    Anyway, he knows feck all about cars and only picked it up yesterday and I took a look over it today. First thing I noticed was that the coolant reservoir was virtually empty. No smoke from the exhaust and no noticeable leaks from anywhere, a bit of a mystery. Next thing to check was to see if there was any gunk in the oil filler cap. Thankfully it was clear.

    Thing which concerned me was that there was air being blown from the oil filler when I removed the filler cap. I got him to rev the engine slightly and the pressure seemed to reduce. Does this indicate a problem such as a knackered one-way valve or is it just something as simple as a secondary air injection system?
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  3. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Mar 13, 2010]
    Its probably just crankcase blowby?

    Most engines will blow some air out the oil cap with the engine running.
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  4. Matt82
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    Matt82 Active Member

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    [Mar 14, 2010]
    normal. just blow by. when you rev the engine, the pcv is having the blow by dragged out by the turbo into the intake systme

    crank case vacuum is a good thing
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