First Generation Firebird-L Mailing List ......................................................................... Congrats on the carb rebuild. Usually the large rear vacuum port on the carb is for the power brakes. It may also have some smaller connections coming off the sides of it for the vacuum motors inside the car. The TVS was part of the emissions strategy. It prevented vacuum to the distributor vacuum advance at at idle at normal temperatures until the vac um delay port on the carb kicked in. When the temperature started climbing and there was a danger of overheating, typically while idling in traffic, it would open and let vacuum to the dist vacuum advance and that would speed up the engine a little as well as make it run more "normal" like cars did before the emissions stuff. That helped prevent overheating. Most of the cars I've seen have just disconnected it leaving the choice of hooking the distributor to either the delay vacuum port on the carb or the regular vacuum port on the carb. At least, that's my understanding of it.
----- Original Message ---- From: Michael Hershey <[EMAIL PROTECTED]> To: First Generation Firebird-L <[email protected]> Sent: Monday, July 14, 2008 11:39:51 PM Subject: [FGF] Thermostatic Vacuum switch hose question First Generation Firebird-L Mailing List ......................................................................... I was reading the info at http://firstgenfirebird.org/FAQ/docs/TVS/68VacuumDialog.pdf regarding the routing of the vacuum lines from the TVS switch and was still confused: I haver a 69 350 2bbl Auto with AC I have a rubber plug on the TVS switch with three lines coming off of it - one to the carb front, one to a the rear of the carb at a splitter that allows for the brake vacuum line, and finally a line to the distributor. Is this correct - or should I have use of the other lines and ditch the rubber "plug" Lastly - I also have a port sticking out of the rear of the carb at the base (right side) - it was always plugged previously - again - is this supposed to be connected to something or is it just a spare port for an accessory I dont have? thanks! PS: successfully finished my first ever carb rebuild this weekend - yay! ------------------------------------------------------------------------ Submissions to Firebird-L: <[email protected]> Unsubscribe from Firebird-L: <[EMAIL PROTECTED]> Help: <http://FirstGenFirebird.org/firebird/Firebird-L.html> Classifieds: <http://FirstGenFirebird.org/ubb/> Owner Pictures: <http://FirstGenFirebird.org/show/> Donations: <http://FirstGenFirebird.org/store/cart.mv?999999> FGF Merchandise: <http://FirstGenFirebird.org/store> ------------------------------------------------------------------------ Submissions to Firebird-L: <[email protected]> Unsubscribe from Firebird-L: <[EMAIL PROTECTED]> Help: <http://FirstGenFirebird.org/firebird/Firebird-L.html> Classifieds: <http://FirstGenFirebird.org/ubb/> Owner Pictures: <http://FirstGenFirebird.org/show/> Donations: <http://FirstGenFirebird.org/store/cart.mv?999999> FGF Merchandise: <http://FirstGenFirebird.org/store>
