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:

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

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

Use the Manual With the Right Hardware

When to See a Mechanic