GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2001 🢒 Metro 🢒 Engine 🢒 Engine Controls - 1.3L 🢒 Crankcase Ventilation System Inspection

Important: If the quanitity of engine blow-by gases exceeds the capacity of the positive crankcase ventilation (PCV) system, oil deposits in the air cleaner may result. Check for a badly worn engine.

Proper operation of the PCV system is dependent upon a sealed engine. A vehicle with a PCV system that passes this functional check may have a PCV valve with an incorrect flow rate or a leak in the crankcase. Replace the PCV valve or inspect the engine's seals and gaskets if the engine uses excessive amounts of oil.

  1. Disconnect the PCV valve and vacuum hose at the valve cover.
  2. Start the engine.
  3. Run the engine at idle.

    4. Object Number: 240571 Size: SH
  4. Place your thumb over the end of the PCV valve in order to check for vacuum.
    5. • Repair the source vacuum supply if no vacuum is felt.
    • Replace the PCV valve if the source vacuum supply is adequate.
  5. Turn OFF the ignition.
  6. Remove the PCV valve.

    7. Object Number: 158669 Size: SH
  7. Shake the PCV valve while listening for the rattle of the plunger inside.
  8. Replace the PCV valve if the valve does not rattle.