Air Injection Systems: Operation

Inlet air to air pump is drawn in through either engine air cleaner, a separate air pump air cleaner or a centrifugal fan filter at front of air pump. Pressurized air leaving air pump is transmitted through hoses, check valve(s) and air manifold(s) to individual exhaust ports or to exhaust manifold, in front of exhaust pipe flange, on some vehicles. Fresh air ignites and burns unburned portion of exhaust gases in exhaust system, thus reducing exhaust emissions.