1981 Mazda B2000 BaseFACTORY OEM SERVICE PROCEDURE

All Other Models

  1. Warm engine to normal operating temperature. Stop engine. Disconnect air control valve-to-intake manifold hose (below No. 1 relief valve) and air control valve-to-catalytic converter hose (bottom of air control valve) from air control valve. Disconnect vacuum sensing tubes from No. 1 and No. 2 relief valves. Disconnect and plug vacuum sensing tube from air switching valve diaphragm.
  2. Start engine and run at idle speed. Place finger over air control valve outlet ports, air should not be discharged from either port. Using additional tubing, connect intake manifold vacuum directly to air switching valve diaphragm. Air should be discharged from air control valve outlet port (below air switching valve). If air switching valve does not respond as outlined, replace air control valve assembly.
Factory Service Tools

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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.

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