Air Injection System: Description
NOTE:
For 1974-78 models, see AIR INJECTION SYSTEMS article in this section.
The air injection system is used to reduce hydrocarbon (HC) and carbon monoxide (CO) emissions. The system adds a controlled amount of fresh air to exhaust gases at the exhaust ports causing oxidation of gases. On all models except Federal 320i, air injection is used in conjunction with a thermal reactor. See Fig 1. The air injection system consists of a belt-driven air pump, a diverter valve, a check valve, electromagnetic switch (Blue), speed relay switch (also used by EGR system), and various connecting hoses and pipes.