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04 Forester 2.5XT
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Did you block the port out the BOV, that will definately be open at idle (as it should be)....

You can't use the stock part as VTA as it opens at part load for fuel economy and will be open at idle by the vacuum from the manifold.

Simon
did a search and found this thread. You're saying that an aftermarket BOV that doesn't open during idle and part load should be ok at idle? Obviously when you're on the throttle and let off you'll go rich briefly from dumping metered air but I'm curious about idle. I highly doubt I would dump mine because of the sleeper effect. again, just curious.
 
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