82-87 Firebird Trans Am Intake TVS Ported Vacuum Switch 2-Port 1/2" NPT LT GREEN

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Code: STD-PVS43

Price: $39.79

Shipping Weight: 0.38 pounds

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New Standard ported vacuum switch. This is a thermostatic (temperature controlled) vacuum switch, also called TVS, and threads into the intake manifold. This switch is 1/2" NPT, has 2 ports (each port is for 3/16" vacuum line), and is NO (normally open) operation. Temperature control color is light green. Switches should be matched to your original switch.

OK, so what is this funky looking thing on your intake manifold? It's a switch that controls vacuum flow based on engine temperature. A switch can be normally open (NO), normally closed (NC) or both (NC/NO on 3-ports). As the engine temperature rises, the switch begins to operate at a specific temperature, which is coded in the color of the switch. Switch color can vary for the same engine due to emission differences (Federal, California, etc) or altitude differences. Typically, these switches would control timing vacuum advance, EGR, transmission operation, and other items controlled by vacuum. For example, a switch may block (NC) vacuum from the distributor when the motor is cold, not allowing the timing advance when the motor is cold. As the motor warms up, the switch begins to open allowing vacuum to the distributor for the vacuum advance timing to function.

There are over 20 different ported vacuum switches on the Camaro/Firebirds, different threads, different vacuum line sizes, and different switching temperatures, so ensure you are ordering the correct switch for your application. View our other listings for other switches. As always, contact us first before purchasing with any questions.

Tips:

3/8" NPT = approx. .650" hole size
1/2" NPT = approx. .825" hole size
NC = normally closed, the vacuum does not flow through the switch when the engine is cold, and vacuum flows when engine reaches switch temperature.
NO = normally open, the vacuum flows through the switch when the engine is cold, and vacuum stops flowing when engine reaches switch temperature.