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07-21-2010, 03:14 AM
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 Toyota Racing Development Join Date: Apr 2007
Posts: 5,038
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The valve in systems which use them are nothing more than a check valve... and the GTE has one built into the upper intake plenum where the PCV pipe connects. It is worth inspecting and cleaning from time to time (don't want the crankcase filling with pressurized air, you'll loose your seals)... but I admit I've never pulled one out. The other port see full time vacuum, but it's quite weak.
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