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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 A/C equipped models, disconnect duty cycle solenoid connector. On all other models, disconnect or remove Green wire only. DO NOT disconnect idle solenoid. Average engine speed should increase at least 50 RPM.
  3. Reconnect solenoid connector. Engine speed should slowly return to 2000 RPM. Disconnect the 6-pin connector at the computer. Connect a ground to harness connector pin 15. 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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