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Difficulty: MediumFuel and Air Intake Systems

In a standard fuel-injected automotive engine, ambient air must pass through several induction components before reaching the combustion chamber. In what sequential order does incoming air travel through these intake components from the atmosphere to the engine cylinder?

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

Answer

The correct sequence of intake airflow from the atmosphere into the engine is: Air filter element, Mass Air Flow (MAF) sensor, Throttle body valve, Intake manifold plenum and runners, and Intake valve.
Air drawn by engine vacuum enters through the air filter housing where contaminants are removed. The clean air passes across the Mass Air Flow sensor to determine fuel metering requirements, through the throttle body plate that regulates engine speed, into the intake manifold runners for even cylinder distribution, and finally past the mechanically timed intake valve into the combustion chamber.

Step-by-Step Solution

1
Identify the initial point of entry for external ambient air.
The air filter element cleans atmospheric air of particulates before it enters the intake tract.
Filtering must occur upstream of all intake sensors and moving components to prevent mechanical damage and contamination.
2
Determine where air mass is measured.
The Mass Air Flow (MAF) sensor measures the mass and density of the incoming filtered air.
The engine control module requires accurate air mass readings before the air is throttled or distributed.
3
Locate the primary airflow control mechanism.
The throttle body valve controls how much air passes deeper into the induction system.
The throttle plate regulates intake manifold vacuum and engine output based on operator demand.
4
Trace the path through the air distribution network.
The intake manifold plenum and runners route the regulated airflow toward individual cylinder ports.
The manifold evenly distributes the charge to each cylinder head intake port.
5
Identify the final gate into the combustion chamber.
The intake valve opens to allow the air charge into the cylinder bore.
The intake valve provides timed mechanical sealing and opening directly at the cylinder head.

Key Concept

Sequential path of induction airflow through automotive engine intake components
Estimated Time:1m 0s
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Topics

Fuel and Air Intake Systems

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