lloydy123

So i replaced the original PCV, which had a torn diaphragm, about 2 years ago. The replacement was an aftermarket one, then I replaced that again last week with a febi bilstein one. I've ordered a vacuum tester and if that shows a high value then I will order up a genuine PCV valve as it must be that which is causing the excess vacuum.

From what I understand hose 4 goes to the intake manifold, that is where the vacuum originates from at idle. Hose 15 is the rear breather hose which joins in just before the turbo which is where the vacuum comes from when under boost. My issue always occurs at idle

Hi folks, I would be grateful if anybody could help me with excessive engine vacuum in my 2008 2.0 TFSI VRS with 190,000 miles (Ive had it since 3 years old). I first became aware of an issue when it threw up the CEL, code P0171 - lean burn bank 1. The car drives perfectly, pulls very well etc, idles normally, no blue smoke or excess oil consumption. I checked for vacuum leaks and found a split hose at the brake vacuum pump which I have now sorted. There are no leaks remaining. Problem is that there remains to be HUGE vacuum on the engine. It is impossible to remove the oil filler cap while the engine is running. To be able to remove it I have to break the vacuum by removing the dipstick and then struggle with 2 hands to remove the filler cap. Also since repairing the vacuum leak when I switch the engine off I can hear oil gurgling from within the engine which occurs until the vacuum is dissipated. I replaced the PCV valve in the hope of resolving the vacuum issue, even though the existing valve appeared to be working normally. Does anybody know why i could have such a huge vacuum? I'm concerned that oil may be vacuuming to where it should not be and hence the gurgling! Many thanks