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Carburetor Duty Cycle Solenoid Test

  1. Connect a tachometer. Set parking brake and start engine. Allow engine to reach normal operating temperature. 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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