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Difficulty: EasyFuel and Air Intake Systems

When the driver presses the accelerator pedal in a fuel-injected gasoline engine, which component directly opens to regulate the volume of air entering the intake manifold?

  1. A
    Exhaust valve
  2. Throttle plateAnswer
  3. C
    Thermostat
  4. D
    Fuel injector

Answer

The throttle plate opens to control the volume of air entering the intake manifold when the accelerator pedal is depressed.
The throttle plate inside the throttle body is linked mechanically or electronically to the accelerator pedal. Depressing the pedal opens the plate, allowing a larger volume of atmospheric air into the intake manifold to increase engine power and speed.

Step-by-Step Solution

1
Identify the primary function controlled by the accelerator pedal in a gasoline engine.
Pressing the pedal controls the amount of intake air allowed into the engine.
Gasoline engine speed and power are fundamentally regulated by throttling incoming air.
2
Match the airflow regulation role to the correct intake system component.
The throttle plate (located within the throttle body) rotates open to permit more air to pass into the intake manifold.
Sensors then measure this increased airflow so the engine computer can command the appropriate fuel delivery.

Key Concept

Airflow regulation via the throttle plate in automotive air intake systems
Estimated Time:45s
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Topics

Fuel and Air Intake Systems

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