We have inlet manifolds or intake manifolds which supply air-fuel mixture to engine.
Inlet Manifold / Intake Manifold :
But how does air reach intake manifold ?
Air intake system provides air to intake manifolds.
Air intake system has :
Mass flow sensor,and
controls the amount of air flowing into an engine,
When accelerator is pressed, throttle plate opens and allows air into the engine.
When the accelerator is released, the throttle plate closes and effectively chokes-off air flow into the combustion chamber.
Air Intake System :
They are located behind front grille of automobiles.