Hyundai Coupes/Sedans 1994-1998 Repair Guide

Crankcase Ventilation System

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See Figures 1, 2, 3 and 4

OPERATION



A positive crankcase ventilation (PCV) system is used to prevent pollutants (blow-by gasses) from being released into the atmosphere. The PCV system supplies fresh air to the crankcase through the air cleaner. The fresh air mixes with the gases and is passed through the PCV valve to the intake manifold. the gasses are then reburned in the combustion process. The PCV system should be inspected every 52,000 miles (84,000 km).



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Fig. Fig. 1: Diagram of the positive crankcase ventilation (PCV) system

TESTING



  1. Remove the PCV valve.
  2.  
  3. Shake the valve. If a rattle is heard, the valve is operational.
  4.  
  5. If a rattle is not heard, insert a thin stick into the PCV valve from the threaded end and push to check if the plunger moves.
  6.  
  7. If the plunger does not move, the valve is clogged and should be cleaned or replaced.
  8.  
  9. Install the hose on the valve and start the engine.
  10.  
  11. Place a finger over the threaded end of the valve and check for vacuum. If vacuum is not present, check the hose for obstructions and replace as necessary.
  12.  
  13. Install the PCV valve.
  14.  

REMOVAL & INSTALLATION





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Fig. Fig. 2: When removing the PCV hose, check it for obstructions by blowing through the hose



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Fig. Fig. 3: Carefully loosen the PCV valve with a wrench and remove from the rocker cover....



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Fig. Fig. 4: ....then shake the PCV valve. If a rattle is heard, the valve is operational

  1. Disconnect the ventilation hose from the PCV valve.
  2.  
  3. Remove the valve from the rocker cover.
  4.  
  5. Thread the new valve into the rocker cover and tighten to 6-9 ft. lbs. (8-12 Nm).
  6.  
  7. Connect the ventilation hose to the valve.
  8.  

 
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