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Home >> GMC >> 1986 >> Caballero Base, 5.0 H, 200C/MV9 >> Repair and Diagnosis >> Engine Performance >> System >> Air Injection Reactor 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 in case of air pump malfunctions.