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Carburetor Duty Cycle Solenoid Test

  1. Remove and plug vacuum hose at vacuum transducer. Connect a tachometer. Connect an auxiliary vacuum supply to vacuum transducer and apply 16 in. Hg. Set parking brake and start engine. Allow engine to reach normal operating temperature. DO NOT ground carburetor switch. Run engine at 1500 RPM.
    NOTE: After any hot start, maintain 1500 RPM for at least 2 minutes before proceeding with test.
  2. Disconnect duty cycle solenoid connector at solenoid. Average engine speed should increase a minimum of 50 RPM. Reconnect solenoid connector. Engine speed should slowly return to 1500 RPM.
  3. Disconnect 12-pin connector at computer. Connect a ground to harness connector pin 11. Engine speed should decrease a minimum of 50 RPM. If engine speed does not change as outlined, service carburetor (check for air leaks).
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