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Intake Air System, Described
The intake air system:
Air Cleaner Element
provides clean air to the throttle body.
outside air enters the engine intake air resonator and then moves through
the opening in the LH front fender apron to the engine air cleaner (ACL).
the positive crankcase ventilation (PCV) system is supplied clean air from
fittings on the air cleaner outlet tube.
intake air noise is effectively eliminated (and restricted) by means of
the sealed and tuned resonator chamber located in the engine intake air
The air cleaner element (ACL element) is:
Intake Manifold Runner Control (IMRC)
a dry-type air cleaner element.
a pleated-paper air filtering element which permits airflow through the
air induction system, filtering out unwanted dust, dirt and debris.
The air induction system improves engine performance by using the intake
manifold runner control (IMRC) assemblies as follows:
The valve plates are opened and closed by the IMRC deactivation motor,
which is controlled by the powertrain control module (PCM).
The intake manifold has two runners per cylinder, feeding each of the intake
parts in the cylinder heads.
The IMRC assemblies are located between the intake manifold and cylinder
heads, providing two air passages for each cylinder.
One air passage is always open and the other passage switches from closed
to open by means of a valve plate.
Below 3000 rpm, this valve plate is closed to improve low-speed and cold
Above 3000 rpm, this valve plate opens to improve high-speed engine performance.