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Home >> Mazda >> 1979 >> B2000 Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> Engine Control Systems >> Exhaust Emissions System - Air Pump Air Injection System >> Testing >> Relief Valve
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Relief Valve

  1. Run engine at idle speed. Hold hand near relief valve to be sure no air flows out of valve at idle speed.
  2. Disconnect vacuum sensing tube from air control valve (Calif, only). Plug tube. Increase engine speed to 4000 RPM. Again, check relief valve. Air should now be flowing out of relief valve.
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