How to remove and install Intake Manifold in 3.5L V6 engine on Lexus RX330?

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The upper intake manifold, referred to by Toyota as the intake air surge tank, requires the disconnection of the negative battery terminal, with a warning for 2GR-FKS engines to relieve fuel system pressure beforehand. After removing the engine cover, all hoses and wiring from the throttle body should be disconnected, with coolant hoses pinched off to prevent draining the cooling system and labeled for clarity. The windshield wiper arms, motor, side seals, and plastic cowl must be removed, followed by the throttle body bracket, upper intake manifold brace, and throttle body. Disconnect all wiring and hoses from the upper intake manifold, then remove the mounting fasteners and the manifold itself, checking the gasket for damage and replacing it if necessary. Installation follows the reverse order, ensuring the mounting bolts and nuts are tightened to the specified torque in a circular pattern starting from the inner bolts. For the lower intake manifold, known as the intake manifold, first remove the upper intake manifold. If replacing the lower intake manifold, the fuel rail should be removed, although for 2GR-FE engines, it may not be necessary unless disconnecting fuel supply and return lines. On 2GR-FKS engines, the upper fuel rail must be removed before the lower intake manifold. After removing the interfering brace and engine mount brackets, unscrew the bolts to take off the lower intake manifold, discarding old gaskets and cleaning the mating surfaces thoroughly. Installation is again the reverse of removal, using new gaskets and tightening the bolts in a criss-cross pattern from the center outward to the specified torque.

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