Air Injection Reaction (AIR) System

Air Injection Reaction (AIR) System The air injection system reduces CO and HC in the exhaust of the engine.

An engine-driven air pump brings fresh air into the exhaust system or exhaust manifold.

The oxygen in the air helps ignite the unburned fuel in the exhaust gases, thus reducing HC and CO in the exhaust.


On some late-model Chrysler products, to meet regulations in certain states, the manufacturer uses the vacuum which is created by the movement of the exhaust gases to draw fresh air into the exhaust manifold.

An aspirator valve regulates fresh air flow.

Your car will have one of the following systems: an air pump, a diverter valve, or an aspirator valve.

Replacing the air pump.

Locate the air pump, which is mounted on the front of the engine and is driven by a belt.

It looks like a small alternator.

Free the adjusting arm bolt, and remove the drive belt, pump holding-bolts, and pump.

Replace the pump and holding-bolts, replace the drive belt, and adjust the belt as described in Chapter 3.

Start the engine and check the diverter valve with your hand as described in Chapter 4 and above right in the Pro Shop.

Replacing the diverter valve and hoses.

Primarily on Ford cars, the diverter valve is connected in the air line with the hose connections between the air pump and the exhaust manifold.

Loosen the four hose clamps that secure the hoses to the valve, the exhaust manifold tubing, and the air pump.

Remove and discard the valve and hoses, and install new ones.

Tighten the hose clamps securely.

Start the engine and check the diverter valve again.

Replacing the aspirator valve on Chrysler products.

Locate the aspirator valve, and remove the air hoses.

Loosen and unscrew the valve from the aspirator tube, using two open-end wrenches, then screw the new valve into the tube and connect the hoses.

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