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Home >> Chevrolet >> 1989 >> Caprice Base, 4.3 Z, 4L60/MD8 >> Repair and Diagnosis >> Engine Performance >> System >> Air Injection System >> Operation >> Check Valve

Check Valve

The check valve prevents the backflow of exhaust gases into the air injection system. The check valve operates when the air pump by-passes at high speeds, extreme engine loads or when air pump malfunctions.