GM Bonneville/Eighty Eight/LeSabre 1986-1999

PCV Valve

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REMOVAL & INSTALLATION



When replacing a PCV valve, you MUST use the correct valve. Many valves look alike on the outside, but have different mechanical values. Putting an incorrect PCV valve on a vehicle can cause a great deal of driveability problems. The engine computer assumes the valve is the correct one and may overadjust ignition timing or fuel mixture.

3.8L (VIN 3 and C) Engine

See Figures 1, 2 and 3

  1. Remove the PCV valve from the grommet in the valve (rocker arm) cover or intake manifold, as applicable.
  2.  



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Fig. Fig. 1: The PCV valve on the 3.8L (VIN C) engine is mounted in the intake manifold

  1. Disconnect the PCV valve from the breather hose.
  2.  



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Fig. Fig. 2: Remove the PCV valve from its grommet, disconnect the vacuum hose, then remove the valve from the vehicle



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Fig. Fig. 3: PCV valve location - 3.8L (VIN C) engine shown

To install:
  1. Connect the new PCV valve into the breather hose.
  2.  
  3. Install the PCV valve into the grommet in the valve (rocker arm) cover.
  4.  

3.8L (VIN 1) Engine

See Figure 4

  1. Disconnect the negative battery cable.
  2.  
  3. If necessary, remove the cosmetic cover from the fuel rail and intake manifold.
  4.  
  5. While holding the access cover down with your finger to keep the spring from pushing the cover off, unfasten the cover retaining bolts.
  6.  
  7. Lift the cover and gasket off slowly.
  8.  
  9. Remove the spring and valve, with the O-ring, from the intake manifold. Inspect the O-ring and replace if damaged.
  10.  



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Fig. Fig. 4: The PCV valve on the 3.8L (VIN 1) engine is located under a cover

To install:
  1. Install the PCV valve and O-ring, then position the spring.
  2.  
  3. Position a new gasket, then install the cover and secure with the retaining screws.
  4.  
  5. If equipped, install the cosmetic cover.
  6.  
  7. Connect the negative battery cable.
  8.  

3.8L (VIN L) Engine

See Figure 5

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the sight shield from the fuel rail and intake manifold.
  4.  
  5. Press down on the access cover and rotate it 1 / 4 turn counterclockwise.
  6.  
  7. Slowly lift off the cover and O-ring.
  8.  
  9. Remove the spring and PCV valve with the O-ring from the intake manifold. Inspect the O-rings and replace if necessary.
  10.  



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Fig. Fig. 5: Exploded view of the PCV valve and related components - 3.8L (VIN L) engine

To install:
  1. Install the PCV valve; replace the O-ring if necessary.
  2.  
  3. Install the spring.
  4.  
  5. Install the O-ring and cover. Hold the cover in place, then rotate it 1 / 4 turn clockwise to lock it into position.
  6.  
  7. Install the sight shield to the fuel rail and intake manifold.
  8.  
  9. Connect the negative battery cable.
  10.  

3.8L (VIN K) Engine

See Figure 6

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the sight shield from the fuel rail and intake manifold.
  4.  
  5. For 1996-99 vehicles, remove the MAP sensor.
  6.  
  7. Using a 1 / 2 in. (1995 vehicles) or 6mm (1996-99 vehicles) socket, press the access cover down and rotate 1 / 4 turn counterclockwise.
  8.  
  9. Lift the cover and O-ring off slowly.
  10.  
  11. Remove the spring and valve with the O-ring from the intake manifold. Inspect the O-ring for damage and replace if necessary.
  12.  



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Fig. Fig. 6: For 1996-99 3.8L (VIN K) engines, you must first remove the MAP sensor (1) and cover (2), then the PCV valve (3) and O-ring (4)

To install:
  1. Position the PCV valve and O-ring.
  2.  
  3. Install the spring.
  4.  
  5. Fasten the cover and O-ring.
  6.  
  7. If necessary, install the MAP sensor.
  8.  
  9. Install the sight shield.
  10.  
  11. Connect the negative battery cable.
  12.  

 
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