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Difficulty: EasyFuel and Air Intake Systems

In a naturally aspirated fuel-injected gasoline engine, what is the correct sequence of components that outside air passes through as it travels from the atmosphere into the combustion chamber? Arrange the components in order from first to last.

  1. 1Air filter element
  2. 2Mass Air Flow (MAF) sensor
  3. 3Throttle body plate
  4. 4Intake manifold runners
  5. 5Intake valve

Answer

Air filter element → Mass Air Flow (MAF) sensor → Throttle body plate → Intake manifold runners → Intake valve
In a standard naturally aspirated fuel-injected engine, atmospheric air enters the air filter housing where airborne debris is trapped. The clean air flows past the Mass Air Flow (MAF) sensor to measure air mass, passes the throttle body plate which controls airflow volume, travels through the intake manifold runners to individual cylinder ports, and finally enters the combustion chamber when the intake valve opens.

Step-by-Step Solution

1
Identify the initial filtration point of the intake system
Outside air passes through the air filter element.
Air must be cleaned of abrasive debris before entering precision electronic metering sensors and engine cylinders.
2
Identify the air measurement component
Filtered air flows past the Mass Air Flow (MAF) sensor.
The engine control unit requires an accurate measurement of incoming air mass to compute the correct fuel delivery.
3
Identify the airflow metering and control valve
Air flows past the throttle body plate.
The throttle plate regulates the total volume of air entering the manifold based on driver demand.
4
Trace the distribution of airflow across cylinders
Air travels through the intake manifold runners.
The intake manifold splits the single intake stream into dedicated runners directed at each cylinder intake port.
5
Identify the combustion chamber entry valve
Air passes through the opened intake valve into the cylinder.
The mechanically timed intake valve opens during the intake stroke to admit the charge into the combustion chamber.

Key Concept

Airflow sequence through a naturally aspirated automotive intake system
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Topics

Fuel and Air Intake Systems

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