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Home >> Chevrolet >> 1987 >> Monte Carlo LS, 4.3 Z >> Repair and Diagnosis >> Engine Performance >> System >> 4.3L TBI Tests W/Codes >> Code 51 - Faulty Prom

Code 51 - Faulty Prom

Check that all pins are fully inserted in the socket. If okay, replace PROM, clear memory and recheck system. If Code 51 reappears, replace ECM.

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