Throttle body fuel injection systems sort of work how carburetors did, but without the carburetor. Instead of each cylinder getting its own fuel injector, there’s only one fuel injector that goes to a throttle body. The fuel mixes with air in the throttle body and then is dispersed to the cylinders via the intake valves.
The above illustration shows the four-stroke cycle in a single cylinder. This is going on in the other cylinders as well. Repeat this cycle a thousand times in a minute, and you get a car that moves.
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