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2.0 tsi vrs engine vacuum

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Has anyone taken their oil filler cap off the car when on idle? I did this with mine only to find quite a bit of suction and hissing as I did so. Is this normal? 2014 vrs 220

Edited by swany

Normal, only worry if it blows rather than sucks. The top end is kept under negative pressure for the PCV system.

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Thank you. With a username like Logitech, I take it you are a mechanic/technician 

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2 hours ago, swany said:

Thank you. With a username like Logitech, I take it you are a mechanic/technician 

Bloody predictive text. Sorry Moggytech 

18 hours ago, swany said:

Thank you. With a username like Logitech, I take it you are a mechanic/technician 

Retired engineer who used to restore Morris Minors. Still keep up to date with modern cars though. :D

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