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Originally Posted by oab_au
... it is the Auxiliary Air Valve that is the problem. It is under the left hand, rear of inlet manifold. The inlet hose, to the AAV, runs off the left hand side of the air box that connects to the throttle bodies. ...
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I have not been able to find a diagram that shows the Aux. Air Valve.
But in this diagram...
http://www.subaruparts.com/subaru.diag/2A/i073A-1.gif
(the "Air duct" diagram, showing the "Boot-air intake")
Is the inlet hose to the AAV that you are talking about the hose labeled H512191 or the short tube labeled "refer to fig. 82A" ?