MAZDA Air Injection System (Piston Engines): Operation: Notes

Air, under pressure from air pump, flows through anti-afterburn valve, through air by-pass valve on 616 models, to check valve. From check valve, air flows to air distribution manifold and enters exhaust manifold through air injection nozzles. During periods of deceleration, air is diverted to intake manifold by anti-afterburn valve to prevent engine popping. Air by-pass valve diverts air to air cleaner, when choke is in operation, to prevent exhaust system overheating on 616 models only. Check valve prevents a back flow of exhaust gases from entering air pump. Air cut valve closes off flow of air/fuel mixture to engine when ignition is switched off to prevent engine run on. Coasting richer device enriches fuel mixture during deceleration to provide a combustible mixture to ensure emission reduction. Dual point distributor is equipped with a retard and an advance point set to provide a fine degree of ignition timing control to reduce emissions. Operation of dual points is controlled by various combinations of control switches. Operation of individual components is as follows: