Toyota Previa 1991-1997 Repair Information

PCV Valve

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The PCV valve regulates crankcase ventilation during various engine operating conditions. At high vacuum (idle speed and partial load range) it will open slightly and at low vacuum (full throttle) it will open fully. This causes vapor to be removed from the crankcase by the engine vacuum and then sucked into the combustion chamber where it is burned along with the fuel.

The PCV system will not function properly unless the oil filler cap is tightly sealed. Check the gasket on the cap and be certain it is not leaking. Replace the cap or gasket or both if necessary to ensure proper sealing.

REMOVAL & INSTALLATION



See Figures 1 through 11

  1. Remove the right side engine cover to access the PCV valve as follows:
    1. Remove the 3 screws and scuff plate.
    2.  
    3. Unbolt and disconnect the right side seat belt from the front floor panel.
    4.  
    5. Remove the 4 bolts and right front seat.
    6.  
    7. Remove the 2 bolts retaining the right front seat leg.
    8.  
    9. Remove the jack and tool bag.
    10.  
    11. Unbolt and extract jack holder.
    12.  
    13. Remove the 9 bolts and right engine service cover.
    14.  

  2.  



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Fig. Fig. 1: Remove these two bolts for the seat leg



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Fig. Fig. 2: Remove the bracket retaining the jack from the side of the seat ...



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Fig. Fig. 3: ... then lift out the jack



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Fig. Fig. 4: Remove the two bolts retaining the jack bracket



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Fig. Fig. 5: Lift out the jack bracket and set it aside



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Fig. Fig. 6: Lift up the carpet and expose the right side engine cover



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Fig. Fig. 7: Remove these 9 bolts ...



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Fig. Fig. 8: ... then lift the right engine cover and remove it from the vehicle

  1. Locate the PCV valve in the No. 2 cylinder head cover and remove it by pulling it upward.
  2.  



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Fig. Fig. 9: Remove the hose clamp from the PCV valve



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Fig. Fig. 10: The PCV valve is recessed in the grommet on the valve cover

  1. Pull the PCV valve off the hose. If applicable, slide the clamp up the hose first.
  2.  

To install:
  1. Slip the hose back onto the proper end of the PCV valve. Secure the clamp if equipped.
  2.  
  3. Press the valve into the retaining grommet in the cylinder head cover.
  4.  



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Fig. Fig. 11: Inspect the grommet before installing a new valve

  1. Install the right side engine hole cover:
    1. Attach the cover and tighten the bolts to 10 ft lbs. (14 Nm).
    2.  
    3. Inatall and tighten the jack holder bolts to 10 ft. lbs. (14 Nm). Install the tool bag and jack.
    4.  
    5. Position and secure the right seat leg to 29 ft. lbs. (39 Nm).
    6.  
    7. Position the seat assembly into the vehicle and secure with the mounting bolts. Tighten the bolts to 29 ft. lbs. (39 Nm).
    8.  
    9. Atach the seat belt to the front floor panel and tighten to 31 ft. lbs. (42 Nm).
    10.  
    11. Install the scuff plate and secure.
    12.  

  2.  

 
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