Vaccum Line Layouts
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Joined: Apr 2004
Posts: 446
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From: Pennsylvania
Car: 1989 Camaro RS
Engine: 350 Holley TBI Personally Tuned
Transmission: 5 Speed
Vaccum Line Layouts
Anyone have a vaccum diagram for an 85 LG4 engine, I esspecially need to know where the two hoses go that come of the vaccum double connection to the left of the thermostat housing, thanks!
Joined: Nov 2002
Posts: 6,668
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From: Oyth
Car: 89RS vert
Engine: Erod
Transmission: 4L65e
Axle/Gears: BW, 3.27
Soundes like the TVS Purge valve.If so the top hose goes the the Vapor Canister.Lower hose tp the canister control valve(just in front of thf TVS valve).These hose are about 1/2in dia.
Joined: May 2004
Posts: 5,338
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From: Lexington, SC
Car: 1987 SC/1985 TA
Engine: 350/vortec/fitech
Transmission: T56
Axle/Gears: 3.27 9-bolt
The TVS for the purge valve is located in the manifold near the water neck. There is another TVS (thermal vaccuum switch) in the water neck that controls the EFE (early fuel evaporation) system. It closes a valve in the pass side exhaust where the manifold and y-pipe meet that forces exhaust gas through intake manifold passages to warm incoming charge and aid cold weather operation. The vaccuum source for the EFE valve is a tee in the air pump vaccuum system.
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