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Ported Vacuum Switch Test

  1. Warm engine until normal operating temperature is reached. Ensure choke plates are fully open. Turn off all accessories.
  2. Disconnect vacuum line from PVS solenoid and connect vacuum gauge to hose.
  3. With transmission in Park or Neutral, check vacuum gauge for vacuum signal. If no vacuum is present, PVS should be replaced. If vacuum is present, PVS is okay.
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