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Old 12-31-2012, 12:16 AM   #13
Scooby Newbie
Member#: 224941
Join Date: Sep 2009
Chapter/Region: Tri-State
Location: Central NJ
09 Wrx
Rally blue


A pcv valve is basically a one way valve. It pulls vapor under vacuum and closes under boost. If there's nothing in it wouldn't boost pressure from the intake pass rite through it and pressurize the crankcase ?
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