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Home >> Pontiac >> 1987 >> Firebird Base, 5.0 H, Standard, MC4 >> Repair and Diagnosis >> Engine Performance >> System >> Air Injection System >> Operation >> Check Valve
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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.