Air enters the intake and then runs through the air box, which houses your air filter. The filtered air runs through your throttle body, which has a throttle plate that opens as you press the accelerator.
After the throttle body, the air flows into the intake manifold, which directs the air to the intake valves for each cylinder.
As each piston begins an intake stroke, the valve opens. The piston acts like the plunger in a syringe, drawing the air through the intake system into the cylinder.
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