GM Lumina/Grand Prix/Cutlass Supreme/Regal 1988-1996

PCV Valve

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See Figures 1 and 2



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Fig. Fig. 1: Vehicles with the 2.3L engine utilize a crankcase ventilation system which uses a oil/air separator instead of a conventional PCV valve



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Fig. Fig. 2: On 1991 vehicles with the 2.5L engine, the standard PCV valve is replaced with a constant bleed orifice

The PCV valve should be inspected every 30,000 miles (50,000 km) for proper operation. A rough idle or oil consumption may result from improper operation or vacuum leak. To maintainProper idle control, the PCV valve restricts the flow when the intake manifold vacuum is high. The system is designed to allow excess blow by gases to be vented into the intake manifold to be burned, reducing hydrocarbon emissions.

Vehicles equipped with the 2.3L (VIN D) engine, or the 1991 2.5L (VIN R), use a crankcase ventilation system that does not use a PCV valve. The 2.3L engine is equipped with an oil/air separator that does not require service. Should the oil/air separator become clogged, the unit must be replace. On the 1991 2.5L engine, the standard PCV valve is replaced with a constant bleed orifice. If the orifice becomes clogged, clear if possible or replace.

REMOVAL & INSTALLATION



See Figures 3, 4 and 5



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Fig. Fig. 3: Positive Crankcase Ventilation (PCV) system-2.8L engine



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Fig. Fig. 4: Location of the crankcase vent valve-1996 3.1 engine shown



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Fig. Fig. 5: Crankcase ventilation pipe routing and valve location-3.4L engine

  1. Remove the PCV valve from the grommet in the valve (rocker arm) cover.
  2.  
  3. Disconnect the PCV valve from the breather hose.
  4.  

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.  

1991-92 VEHICLES



See Figure 6

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Fig. Fig. 6: PCV valve location-1992 3.8L engine shown

  1. Disconnect the negative battery cable.
  2.  
  3. 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 screws.
  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.  

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. Install the cosmetic cover.
  6.  
  7. Connect the negative battery cable.
  8.  

1993-96 VEHICLES



See Figure 7

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Fig. Fig. 7: 1995-96 3.8L engines, you must remove the MAP sensor before removing the crankcase ventilation valve

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the sight shield from the fuel rail and intake manifold. -96 vehicles, remove the MAP sensor. turn counterclockwise.
  4.  
  5. Lift the cover and O-ring OFF slowly.
  6.  
  7. Remove the spring and valve with the O-ring from the intake manifold. Inspect the O-ring for damage and replace if necessary.
  8.  

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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