Intake Manifold: Description and Operation

DESCRIPTION










The aluminum intake manifold is a two piece design joined by a frontal cross coolant passage. Incorporated into the intake manifold assemblies are swirl and charge air channels. The swirl channels have blades that are electronically controlled by PWM signals from the ECM via a swirl valve actuator. In their normal resting position the swirl valves are open. Charge air and cooled EGR exhaust gasses are combined within the intake manifold. The swirl valve assembly assists in the mixing of these inlet airs within the cylinder. The swirl valves themselves are not serviceable separately, should a failure occur, the intake manifold must be replaced.