I try to find a vacuum leak. I tested the sai system, that works fine. By doing this I found the measure 077 block. I cannot find any explanation on the sai percentage. Just curious.
I'm still on my vacuum quest.
VW recommended to exchange the maf, since it had a low reading. I exchanged it for a new bosch oem maf, same values. So placed the old one back.
When I squeeze the rubber hose between intake manifold and Y link to brake and pcv line on top of the engine I hear a hissing sound and when measuring vacuum on intake manifold at the same time I see the vacuum decreasing, but it settles back after a while. However I cannot find any cracks in this rubber.
Also when I press the brake pedal I loose some vacuum on the intake manifold, I'm not sure if that is normal.
Another potential issue i noticed is at the valve cover. I don't seem to have a vacuum there. I have slight vacuum however in carter. When i remove dipstick the STFT and LTFT changes, but not much happens if I remove oil filler cap.