2.0 tsi vrs engine vacuum

[swany]

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 27 November, 2018 by swany

[MoggyTech]

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

[swany]

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

[swany]

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 

[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.