Drain the cooling system.
Relieve the fuel system pressure.
Remove or disconnect the following:
Negative battery cable
Air intake duct
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
Positive Crankcase Ventilation (PCV) valve and hose
Evaporative Emissions (EVAP) canister vacuum and purge hoses
Brake booster vacuum hose
Fuel pressure regulator vacuum hose
Spark plug wires
Left bank injector connectors
Upper intake manifold ground cable (VG33)
Upper intake manifold (VG33)
Intake manifold collector (VG33ER)
Right bank injector connectors
Fuel supply manifold
Engine Coolant Temperature (ECT) sensor connector
Lower intake manifold. Loosen the fasteners in the sequence shown.
Intake manifold bolt loosening sequence—3.3L engine
Intake manifold bolt torque sequence—3.3L engine
Install the lower intake manifold with a new gasket.
Tighten the fasteners in sequence as follows:
Step 1: 35 inch lbs. (4 Nm)
Step 2: 78 inch lbs. (9 Nm)
Step 3: 70–84 inch lbs. (8–10 Nm)
Install or connect the following:
ECT sensor connector
Upper intake manifold
Upper intake manifold ground cable
EVAP canister vacuum and purge hoses
PCV valve and hose
EGR Solenoid valve connector
TP sensor and switch connectors
IAC valve connector
Fill the cooling system.
Start the engine and check for leaks.