Air Pump

Check delivery pressure of air pump as follows: Disconnect air supply hose at intake side of check valve and plug check valve. Connect pressure gauge to outlet of air pump and run engine at 1500 RPM. Delivery pressure should be more than 2 psi (.15 kg/sq. cm). If pressure does not reach this value, disconnect air supply hose at anti-afterburn valve and repeat test. If air pressure still does not rise, air pump or relief valve could be defective. Finally, run engine at 3000 RPM. If no air flows out of relief valve it is defective and should be replaced. For pump disassembly, refer to Mazda Air Injection Pump in EMISSION Section  .