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Vacuum Retard Test

  1. Connect tachometer and timing light to engine. Connect Vacuum Advance Tester (VAG 1368 ) according to manufacturer's instructions. Remove both plugs from idle stabilizer (if equipped) and connect together.
  2. Start and run engine at 900 RPM. Disconnect vacuum advance hose from unit and check ignition base timing and idle speed. Adjust if necessary. Disconnect vacuum retard hose from unit. Plug hose.
  3. Bring base timing mark back to pointer by using dial on timing light and read vacuum retard. Retard should be 8-11 degrees. After testing, reconnect idle stabilizer plugs. Reconnect vacuum hoses.
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