Mitsubishi Eclipse 1990-1998 Repair Guide

PCV Valve

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See Figure 1

The Positive Crankcase Ventilation (PCV) valve is part of a system which is designed to protect the atmosphere from harmful vapors. Blow-by gas from the crankcase, as well as fumes from crankcase oil are diverted into the combustion chamber where they are burned during engine operation. Proper operation of this system will improve engine performance as well as decrease the amount of harmful vapors released into the atmosphere.



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Fig. Fig. 1: Typical Position Crankcase Ventilation (PCV) system schematic

See Figures 2, 3, 4, 5, 6, 7, 8 and 9

  1. Disconnect the negative battery cable.
  2.  



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Fig. Fig. 2: Positive Crankcase Ventilation (PCV) valve location-1.8L engine



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Fig. Fig. 3: Positive Crankcase Ventilation (PCV) valve location-1990-94 2.0L engine



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Fig. Fig. 4: PCV valve location-1995-98 2.0L (non-turbo) engine



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Fig. Fig. 5: Location of the PCV valve-1995-98 2.0L (turbo) engine



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Fig. Fig. 6: The PCV valve is located in the camshaft cover-2.4L engine

  1. If necessary for access, remove the air intake hose and air cleaner assembly.
  2.  
  3. If necessary, unfasten the retaining clamp, then disconnect the ventilation hose from the PCV valve.
  4.  



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Fig. Fig. 7: Use a pair of pliers to unfasten the PCV hose retaining clamps



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Fig. Fig. 8: Disconnect the valve cover-to-PCV valve hose ...



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Fig. Fig. 9: ... then unplug and remove the PCV valve from the vehicle

  1. Remove the PCV valve from the camshaft (rocker) cover.
  2.  

To install:
  1. Install the PCV valve into the rocker cover. If the valve is threaded, tighten to 6-8.5 ft. lbs. (8-12 Nm) torque.
  2.  
  3. Reconnect the ventilation hose to the valve.
  4.  
  5. If removed, install the air intake hose and the air cleaner assembly.
  6.  
  7. Connect the negative battery cable.
  8.  

FUNCTIONAL CHECKS



See Figures 10 and 11

  1. After disconnecting the ventilation hose from the PCV valve, remove the PCV valve from the cover and reconnect the PCV valve to the ventilation hose.
  2.  
  3. Run the engine at idle, then place your thumb over the end of the valve to check for vacuum.
  4.  
  5. If no vacuum exists, check for plugged hoses, manifold port vacuum at the throttle body or a defective PCV valve.
  6.  



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Fig. Fig. 10: Check for vacuum at the PCV valve by placing your thumb over the end of the valve while the engine is idling

  1. Inspect the valve as follows:
    1. Insert a thin stick into the positive ventilation valve from the threaded side to check that the plunger moves. If the plunger does not move, the PCV valve is clogged.
    2.  

  2.  



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Fig. Fig. 11: Inspecting the PCV valve for plunger movement

 
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