Air Induction System

Intake System Components:

Naturally Aspirated Fuel/Emission Schematic:

PURPOSE

The air induction system supplies and controls the amount of air required by the engine for smooth operation.


OPERATION

When the engine is running, the air passes into the engine air cleaner assembly where dirt is filtered out by the air filter element. The filtered air then flows through and is measured by the Volume Air Flow (VAF)meter.

The VAF measures the amount of air flowing through the intake air system to the engine, and sends this information to the Powertrain Control Module (PCM). The PCM uses this information as one of the inputs to calculate fuel control.

The metered air passes through the air cleaner outlet tube, and into the throttle body.

The air flow through the Throttle Body (TB) is regulated by the driver through the accelerator pedal and cable. The throttle plate in the TB controls the air flow as it is opened and closed according to throttle position, for engine power and speed demands. This metered air then enters the upper and lower intake manifolds where it is mixed with fuel for combustion.

To maintain a steady idle speed, extra air is drawn in by the Idle Air Control Bypass Air (IAC BPA) valve, bypassing the TB plate, allowing computer controlled engine idle.


COMPONENTS

^ Engine air cleaner lower assembly

^ Engine air cleaner upper assembly

^ Engine air cleaner intake tube

^ Air cleaner element

^ Volume air flow meter

^ Throttle body

^ Idle air control bypass air valve

^ Air cleaner outlet tube