Air Induction System

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, air is drawn into the engine air cleaner assembly where dirt is filtered out by the air filter element. The filtered air then flows through the Mass Airflow Sensor (MAF).

The MAF 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 its inputs to calculate fuel control.

The air flow is regulated by the driver through the accelerator pedal and cable to the Throttle Body (TB). The throttle plate in the TB then controls the air flow as it is opened and closed by the driver, for vehicle power and engine speed demands. This metered air then enters the upper intake manifold where it is distributed to all the cylinders, and drawn into each cylinder for mixture with fuel for engine operation.

At idle, extra air is drawn in by the Idle Air Control Bypass Air (IAC BPA) valve bypassing the TB for computer controlled engine idle.

To reduce intake air noise, an intake air resonator is installed in the intake air system.


COMPONENTS

^ Engine air cleaner assembly

^ Engine air intake resonator

^ Mass airflow sensor

^ Throttle body

^ Upper intake manifold

^ Idle air control bypass air valve