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Difficulty: EasyFuel and Air Intake Systems

In a standard fuel-injected automotive engine, what is the correct sequence through which ambient air travels from the outside environment into the engine cylinder?

  1. 1Air filter
  2. 2Mass Airflow (MAF) sensor
  3. 3Throttle body
  4. 4Intake manifold
  5. 5Intake valve

Answer

Air filter → Mass Airflow (MAF) sensor → Throttle body → Intake manifold → Intake valve
In an internal combustion engine with electronic fuel injection, outside air enters through the air filter housing, flows across the Mass Airflow sensor to measure air mass, passes through the throttle body where airflow volume is regulated, travels through the intake manifold runners, and finally enters the cylinder when the intake valve opens.

Step-by-Step Solution

1
Identify the initial intake component
Air filter cleans incoming ambient air
Air must be cleaned of abrasive dirt particles immediately upon entering the intake duct before reaching sensitive sensors or moving parts.
2
Identify the airflow measurement stage
Mass Airflow (MAF) sensor meters the incoming air
The engine computer requires a precise measurement of clean incoming air mass to calculate the correct fuel delivery.
3
Identify the airflow regulation stage
Throttle body controls total airflow into the engine
The throttle plate modulates the volume of air passing into the engine based on accelerator pedal position.
4
Identify the airflow distribution stage
Intake manifold routes air to individual cylinders
The intake manifold splits the single airflow stream into individual runner tubes directed to each cylinder head port.
5
Identify the cylinder entry point
Intake valve opens into the combustion chamber
The mechanically actuated intake valve opens during the intake stroke to draw the charge directly into the cylinder.

Key Concept

Component sequence and flow path in an automotive air intake system
Estimated Time:45s
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Topics

Fuel and Air Intake Systems

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