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.
As mentioned above, the camshaft and crankshaft coordinate their movement via a timing belt or chain. The timing chain holds the crankshaft and camshaft in the same relative position to each other at all times during the engine’s operation. If the camshaft and crankshaft become out of sync for whatever reason (the timing chain skips a gear cog, for example), the engine won’t work.
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