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FPB111 FPB111 is offline
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Join Date: Jan 2008
Location: NJ
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With the electrical plug unplugged no air should be able to pass through in the direction of the throttle body. Really not either way. With power to it air should pass through.

This valve allows fuel vapor to pass through the charcoal can purging it by pulling fuel vapor through the engine.
This alters the fuel/air mix in an uncontrolled manner.

With the engine fully warmed up, running at a predetermined RPM, this valve clatters like a fuel injector as long as a vapor recovery test is not being performed.

Next time this happens try holding the gas pedal down to see if it helps.
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2004 996 Turbo CAB X50
2003 996 cab 6 speed Sold
1972 RS 3.2 twin plug short stroke crank fire, roll bar, sold
DE instructor since 1985
Frank

Last edited by FPB111; 04-20-2018 at 02:50 PM..
Old 04-20-2018, 02:44 PM
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