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It is not likely that a pop-off valve leak would cause your high idle problem. A vacuum leak into the intake manifold is an "unmetered air" leak, that is a leak after the air flow sensor. This is outside air that has not passed through the air flow sensor. A leak of this sort leans out the mixture, whereas a leak through the AAR or AAV does not affect the mixture, as this is air that has already passed though the air flow sensor. Try lifting the pop-off at high idle, you should meet with significant resistance. If it is easy to lift, you have located a problem. Your engine should die right away.
Alternately, you can try some firm pressure on the top of the pop-off valve. Should have no effect on the idle speed.
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Jim
www.jimsbasementworkshop.com
(CIS Primer for the 911)
(73 911T (RS look) coupe)
(Misc. 911 Parts for Sale)
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