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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 2000 RPM.
  2. On air conditioned models only, disconnect idle solenoid connector. On all models, disconnect Green wire from duty cycle solenoid. Average engine speed should increase at least 50 RPM.
  3. Reconnect solenoid connector. Engine speed should slowly return to 2000 RPM. Disconnect the 12-pin connector at the computer. Connect a ground to harness connector pin 11. Engine speed should decrease at least 50 RPM. If engine speed does not change as outlined, service carburetor (check for air leaks).
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