Air Injection System: Description

Air Injection Reaction (AIR) system is used to reduce Carbon Monoxide (CO) and Hydrocarbon (HC) emissions. AIR system provides additional oxygen to continue combustion process after exhaust gases leave combustion chamber. AIR system diverts air from exhaust manifold during increased RPM or when electrical malfunction is detected within the system.

Federal system (over 10,000 GVW) used on 5.7L or 7.4L engines consist of 2 air pumps, an air filter, 2 High-Flow Electric Air Control (HFEAC) valves, 2 check valves, a control module and necessary plumbing. The 7.4L engine also uses a control relay to operate "Service Engine Soon" light.

California systems and all models under 10,000 GVW consists of one air pump, air filter, air injection tubes, diverter valve (over 10,000 GVW), an Electric Air Control with Relief Tube valve (ECT, 4.3L and V8 engines, under 10,000 GVW) or an Electric Air Control valve (EAC, 2.8L engine), check valves, air manifold assembly and hoses connected to various components.