Knocking sound while idle

[spacewitch]

Do you guys have any idea what's causing this knocing noise. the car model 2010 vw golg gti

https://redgifs.com/watch/multicoloredrepulsiveweasel

 

[BudgetPhoenix]

Normal. Its the evap purge valve running. I believe the ECU activates it it when it needs to it will go away eventually but it does make that tick tick tick sound.