Air Induction System: Description
The air induction system is used to reduce hydrocarbon (HC) and carbon monoxide (CO) emissions by supplying filtered air to the exhaust manifold. System consists of an air induction valve, induction valve filter, air injection tubes, and various connecting hoses.
Note direction of air flow.
In addition, an anti-backfire valve is used on all models except Federal Pickup and a vacuum switching valve and water temperature sensor is used on Sentra M.P.G. models.