do you have a CEL ?
Does your idle change when its off?
I can easily pull my oil cap off and doesnt affect idle.
I thought if the cap was hard to pull off that was good?
The PCV is fine if idle/rev smoothness changes while idling and something removed. With the cap off and idling, place your hand over the filler hole and feel/notice suction or no suction....also notice rev change or no change.
So, OP, your PCV should be fine if cap is hard to remove while idling. I used to run a 'PCV plate/constant recycling'...can't remember if it made the results different...? I still have the BSH stage 1 PCV just in case I started going through PCV's over and over. But have yet to have one fail. It's been replaced twice due to open campaigns, but never due to failure.
1. the cap initially does feel like negative pressure on it but once its off, it feels like pressure coming out with a gurgly chugging sound. with the flashlight on it, I can faintly see smoke or vapor?
2. rpms do NOT fluctuate when the cap is off.
3. what side of the pcv do I blow through? in or out?
now the kicker.. I drained my can last week and literally rusty looking water came out. Usually its always oily looking water with some chunks and always separates in the bottle. This was just mucky looking and no I have ZERO sludge on my oil cap.
I currently have the BSH CC
There should be suction. However, I was incorrect on the idle change...should run smooth if pcv is OK. I apologize for for the incorrect info...went on memory and it gets wrong sometimes...bcuz 55yrs I guess. Will edit the post with correct info :sm3:
Here's some reading...http://mkv-gti.net/wiki/index.php?title=PCV_valve_failure ...although I believe the writer to be incorrect where it's said "The system consists of a rear valve that is attached to the turbo inlet to provide fresh air into the crankcase". I believe the valve inside the rear tube closes to disallow flow from the turbo into the crankcase under vac at idle. I cannot imagine why the rear tube allows intake flow, under vac, when the PCV has an anti-return valve just on the other side of the valve cover...making the pcv to rear tube channel through the valve cover a one-way trip.
VegasGTI is correct in that if you blow where there are anti-return valves...if you look at page 13(page 9 of the document) and notice where the anti-return valves are: http://mkv-gti.net/wiki/images/e/e7/The_2.0L_FSI_Turbocharged_Engine_Design_and_Function_VW20T_.pdf
Do you see where the diagram shows flow out of the PCV? Those points are where you check to see if you can blow in to them.how to check ?
Ted...↑This↑...none of this relates to yours. It is only the oem PCV you can test in this manner to see if the anti return valves are intact inside the PCV. The OP has a stock PCV.If you have a catch can it eliminates the pcv return functions and stays open always.