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Home >> Mazda >> 1971 >> 1200 Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> MAZDA Air Injection System (Piston Engines) >> Inspection & Testing >> Check Valve

Check Valve

Disconnect air supply hose at check valve and run engine at 1500 RPM. Place hand near check valve and check for backflow of exhaust gases.

NOTE: Do not confuse backflow with pulsations of air intake at low engine speeds.

Also check valve for carbon deposits, damage or deterioration. Replace valve if defective.

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