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Old 04-22-2008, 08:18 PM   #2
boxs2000
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Join Date: Apr 2005
Location: cali
Posts: 131
That tube you circled is part of the intake, specifically inside it is a DME controlled resonance flap. The resonance flap allows the length of the intake air track to be optimized over a broader range of speed. If the hissing sound is coming from there, check the solenoid valve as it activates a vacuum servo that opens and close the resonance flap. (its located about the middle of that tube)

Last edited by boxs2000; 04-22-2008 at 08:21 PM.
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