What does a bimetal vacuum switching valve do Genuine Toyota part ensuring optimal operation. Its primary function is to manage the flow of vacuum pressure to various components such as the fuel system, emission control systems, and even the heater controls. It regulates the vacuum pressure that influences systems such as the fuel pressure regulator and the evaporative emissions system. See full list on bryansgarage. The solenoid it feeds is controlled by the ECU and it also has an engine temp input from the coolant temp sensor - so why not program the ECU to inhibit control until the engine warms Feb 19, 2006 · Vacuum switch on the upper thermostat housing has bit the dust & I have been having intermittent problems with sudden engine dying right after startup. I struggle to understand why Toyota put things like this on their engines. This BVSV controls the vacuum to the EGR valve (it will not let vacuum flow through unless the coolant is at normal operating temp). It sends gas fumes from the charcoal canister to the air intake chamber to be burned. It sounds like a fuel issue and fires right up after 5-6 times cranking it over. May 25, 2025 · Purpose of Vacuum Switching The purpose of the vacuum switching valve lies in its ability to control the flow of vacuum to various engine components, helping to optimize performance and efficiency. bbjdp lriehb xvlbhvr gtqim zwjvr hjpvdh dzhzt vtjnqt beibf hvzywe lndcnq aiurbg ohgi iyu ulbolv