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Re: Vacuum Advance [message #65854 is a reply to message #65853] Sat, 28 November 2009 12:58 Go to previous messageGo to previous message
rgleas is currently offline  rgleas   United States
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Registered: May 2009
Location: Tulsa, Ok.
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The GMC maintenance manual shows the distributer vacuum line going to the Tvs switch top port. The middle port of the TVS switch goes to the carburator and the bottom port goes to the manifold. The TVS sewitch retards the advance during cold engine conditions.
 
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