Air Injection System: Description
NOTE:
For 1974-78 models, see Fig 1 article in this section.
This system uses a belt-driven air pump to supply air under pressure to the exhaust manifold where it mixes with exhaust gases and causes further oxidation (burning) of the exhaust gases. The injected air from the pump passes through a one-way check valve to a single entry point in the exhaust manifold. See Fig 1. The one-way check valve prevents the reverse flow of exhaust gases into the air pump when exhaust gas pressure exceeds air pump pressure. A relief valve, located in the air pump, is used to dump excess pump pressure at high engine speeds to prevent pump damage.