Quote:
Originally posted by BigRedFord04
To Mark's comments:
I tried plugging the breather element and it would blow the PCV valve out of the valve cover within 30 seconds which does show a buildup of pressure, i'm just not sure how much build up would be considered "normal".
If that is the case, wouldn't a compression test give a false hope that it is a valve by not reading full compression because it is leaking thru the rings instead of a valve?
1. There should be no build up of pressure because the PCV valve should allow enough vacuum to scavenge any blow by. If there is not enough vacuum, or too much blow by, pressure will escape through the breather or the dipstick. To see if you have too much blow by, make sure the PCV is working, then pull the breather line. You should feel vacuum when you put a finger over the breather hole. If you get enough pressure to leak past your finger or out the dipstick, you have too much blow by.