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Home >> Mazda >> 1979 >> B2000 Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Emissions System - Air Pump Air Injection System >> Testing >> Check Valve

Check Valve

  1. Warm up engine until normal operating temperature is reached. Disconnect air pump outlet hose from check valve or from air by-pass valve.
  2. Slowly increase engine speed to 1500 RPM while holding hand over open connection. Check for exhaust leak (back-pressure escaping through check valve). If there is exhaust gas leak at this point, replace check valve.
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