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How does the choke works?

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In a car, the choke refers to the choke valve which is sometimes installed in the carburettor of internal combustion engines. It restricts the flow of air, thereby enriching the fuel-air mixture while starting the engine. By restricting the flow of air, it reduces the pressure inside the throat, which causes a proportionally greater amount of fuel to be pushed from the main jet into the combustion chamber during cold-running operation.

Includes CC-BY-SA content from Wikipedia's Choke valve article (authors)

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