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1978-79 Fiesta

  1. Disconnect crankcase ventilation hose at air cleaner. Start engine and idle. Place a 3 x 5 card over open end of hose. If vacuum does not hold card, disconnect hoses and remove cap.
  2. Soak cap in solvent for 5-30 minutes. Do not soak longer than 30 minutes. Shake cap dry, do not use compressed air. Reinstall cap and repeat above test. If system does not operate properly, replace cap assembly.
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