Need some assistance, I installed a catch can last week and deleted all the PCV lines under the intake manifold.
My car seems to have a really terrible idle and overboosting randomly, VAG code 17705 Pressure drop (checked DV already).
On the oil catch tank DIY's I see that they installed additional or original check valve back in place, could anyone shed some light on this? What size valve and which direction it would face?
All of this was removed including the check valve