DeVille, Eldorado, Seville 1999-2005

Intake Manifold

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Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Relieve the fuel system pressure.
  4.  
  5. Drain the cooling system.
  6.  
  7. Remove or disconnect the following:

    Negative battery cable
     
    Intake manifold heat shield
     
    Sight shield
     
    Coil module connectors from the coil modules located on the valve covers
     
    Positive Crankcase Ventilation (PCV) hose and valve from the valve cover
     
    Fuel regulator vacuum tube
     
    Vacuum tubes from the AIR solenoid
     
    Fuel inlet and return lines
     
    Fuel rail bracket retaining nut at the rear lift bracket
     
    2 pushnuts attaching the engine coolant heater wire and set it aside, if equipped
     
    Fuel injector electrical connections
     
    Fuel rail and injectors
     
    Plenum duct clamp at the rear of the intake manifold, loosen
     
    Intake manifold bolts and the manifold
     

  8.  
  9. Clean the manifold mating surfaces.
  10.  

To install:

Click image to see an enlarged view

Fig. Intake manifold torque sequence- 4.6L engines

  1. Grease the inside edge of the rubber plenum duct.
  2.  
  3. Position the intake manifold by performing the following sub-steps:
    1. Place the rear of the intake manifold into the plenum duct.
    2.  
    3. Place the front of the intake manifold downward on to the cylinder heads.
    4.  

  4.  
  5. Install the intake manifold bolts and torque to 89 inch lbs. (10 Nm) in the sequence illustrated. DO NOT torque the intake manifold bolts when the engine is HOT or at operating temperature.
  6.  
  7. Make sure the plenum duct is fully attached to the rear of the intake manifold and tighten the plenum duct clamp to 20 inch lbs. (2.25 Nm).
  8.  
  9. Install or connect the following:

    Fuel rail and injectors and tighten the rail retainers to 89 inch lbs. (10 Nm)
     
    Fuel injector electrical connections
     
    Alternator coolant pipe/surge tank pipe and position onto the fuel rail studs
     
    Engine coolant heater wire onto the studs and install the pushnuts, if equipped
     
    Fuel rail bracket retaining nut at the rear lift bracket and tighten to 89 inch lbs. (10 Nm)
     
    Fuel inlet and return lines
     
    Vacuum tubes to the AIR solenoid
     
    Fuel regulator vacuum tube
     
    Positive Crankcase Ventilation (PCV) valve and hose to the valve cover
     
    Coil module connectors to the coil modules located on the valve covers
     
    Sight shield
     
    Intake manifold heat shield
     
    Negative battery cable
     

  10.  
  11. Fill and bleed the cooling system.
  12.  

 
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