What is the function of the choke valve?

[MartinAnn]

The function of the choke valve is to appropriately close part of the air intake during cold engine starts, increasing the gasoline concentration in the mixture entering the cylinders to improve engine starting performance. After the engine is running normally, the choke valve should be fully opened; otherwise, an overly rich mixture can cause the engine to operate abnormally and lead to excessive fuel consumption. Definition of the choke valve: The choke valve is a component of a gasoline engine's carburetor, typically located at the carburetor's air intake, and is operated via a control knob installed on the dashboard. Usage of the choke valve: When starting the engine, the driver pulls out the choke knob on the dashboard, which closes the choke valve via a cable, causing the carburetor to supply a very rich mixture to facilitate engine starting. After starting, the driver should push the choke knob back to a nearly fully open position. At the same time, the throttle should be slightly opened to increase engine speed, shortening the warm-up time. Once the engine is warmed up, the choke knob should be fully pushed back.