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11-21-2013, 01:27 PM
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#4 |
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Registered User
 
Join Date: May 2011
Location: Missoula, MT
Posts: 934
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Re: Loud Vacuum Sound - 99 Chevy Sub C1500
The intake manifold is a 2 piece, and the top section slides over the oval section where the fuel and the harness pug in. The o ring that seals the oval section to the top is probably leaking or there is a crack in the plastic top section or both.
Google: L31 intake diagrams and you can find exploded diagrams of what I am talking about
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