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Solenoid Vacuum Valve Function Test

  1. With engine at normal operating temperature, place man. trans, in Neutral, auto, trans, in Park and apply parking brake.
  2. Disconnect distributor vacuum advance line at solenoid valve. Install vacuum gauge to vacuum solenoid valve. Start and run engine at 1000 RPM. No vacuum should be indicated.
  3. Maintain speed and disconnect 2-wire connector from solenoid. Vacuum gauge should indicate ported vacuum. Connect and disconnect wire several times to verify operation. Replace valve if defective.
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