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Home >> Chevrolet >> 1972 >> P20 Van 4.1L Eng VIN L >> Repair and Diagnosis >> Engine Mechanical >> Auxiliary Emission Control Systems >> Computer Command Control >> Maintenance & Testing >> Time Delay Relay
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Time Delay Relay

Remove temperature switch wire at temperature switch. Turn ignition switch on. Solenoid should energize for 20-25 seconds and then de-energize. If it does not de-energize, remove purple lead from delay relay. Solenoid will de-energize, delay relay is faulty.