Infinity_QX4_1998-2003

Intake Manifold

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Removal & Installation



3.3L And 3.5L Engines
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Drain the cooling system.
  4.  
  5. Relieve the fuel system pressure.
  6.  
  7. Remove the or disconnect the following:

    Negative battery cable
     
    Air intake duct
     
    Accelerator cable
     
    Cruise control cable
     
    Idle Air Control (IAC) valve connector
     
    Throttle Position (TP) sensor and switch connectors
     
    Ignition coil and power transistor connectors
     
    Exhaust Gas Recirculation (EGR) Solenoid valve connector
     
    EGR temperature sensor connector
     
    Radiator hoses
     
    Heater hoses
     
    Positive Crankcase Ventilation (PCV) valve and hose
     
    Evaporative Emissions (EVAP) canister vacuum and purge hoses
     
    Brake booster vacuum hose
     
    Fuel pressure regulator vacuum hose
     
    EGR tube
     
    Spark plug wires
     
    Distributor, if equipped
     
    Left bank injector connectors
     
    Thermal transmitter
     
    Upper intake manifold ground cable
     
    Breather pipe
     
    Upper intake manifold
     
    Fuel lines
     
    Right bank injector connectors
     
    Fuel supply manifold
     
    Engine Coolant Temperature (ECT) sensor connector
     
    Lower intake manifold. Loosen the fasteners in the sequence shown.

    Click image to see an enlarged view

    Fig. Intake manifold loosening sequence-3.3L engine



    Click image to see an enlarged view

    Fig. Intake manifold exploded view-3.5L engine

     

  8.  

To install:

Click image to see an enlarged view

Fig. Intake manifold torque sequence-3.3L engine

  1. Install the lower intake manifold with a new gasket.
  2.  
  3. For 3.3L engines, tighten the fasteners in sequence as follows:
    1. Step 1: 35 inch lbs. (4 Nm)
    2.  
    3. Step 2: 78 inch lbs. (9 Nm)
    4.  
    5. Step 3: 70 - 84 inch lbs. (8 - 10 Nm)
    6.  

  4.  
  5. For 3.5L engines, tighten the fasteners in sequence as follows:
    1. Step 1: 86 inch lbs. (4 Nm)
    2.  
    3. Step 2: 23 ft. lbs. (9 Nm)

      Click image to see an enlarged view

      Fig. Lower intake manifold torque sequence-3.5L engine

    4.  

  6.  
  7. Install or connect the following:

    ECT sensor connector
     
    Fuel supply manifold
     
    Right bank injector connectors
     
    Fuel lines
     
    Upper intake manifold

    Click image to see an enlarged view

    Fig. Upper intake manifold torque sequence-3.5L engine

     
    Breather pipe
     
    Upper intake manifold ground cable
     
    Thermal transmitter
     
    Left bank injector connectors
     
    Distributor, if equipped
     
    Spark plug wires
     
    EGR tube
     
    Fuel pressure regulator vacuum hose
     
    Brake booster vacuum hose
     
    EVAP canister vacuum and purge hoses
     
    PCV valve and hose
     
    Heater hoses
     
    Radiator hoses
     
    EGR temperature sensor connector
     
    EGR Solenoid valve connector
     
    Ignition coil and power transistor connectors
     
    TP sensor and switch connectors
     
    IAC valve connector
     
    Cruise control cable
     
    Accelerator cable
     
    Air intake duct
     
    Negative battery cable
     

  8.  
  9. Fill the cooling system.
  10.  
  11. Start the engine and check for leaks.
  12.  

 
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