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Removal (GS430 & LS430)

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 Lexus SC 430, 2003 Lexus RX 300, 2003 Lexus LX 470, 2003 Lexus LS 430, and 2003 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Intake Air Control (IAC) valve is bolted to underside of upper intake manifold. See Figure. Remove intake air connector pipe. Remove throttle body. See THROTTLE BODY  under FUEL SYSTEM. Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE  under FUEL SYSTEM. Disconnect fuel inlet hose. See Figure.
  2. Disconnect EVAP vacuum switching valve connector and vacuum hoses. Remove No. 2 engine cover bracket from engine hanger. See Figure. Remove EVAP vacuum switching valve from upper intake manifold.
  3. Remove No. 3 engine cover bracket from upper intake manifold. Remove 4 bolts and left wiring harness protector from upper intake manifold and camshaft bearing cap. Disconnect wire clamps on right engine wire from brackets on right fuel rail. Remove bolts and disconnect rear engine wiring harness protector from rear water bypass joint and right cylinder head.
  4. Disconnect ACIS vacuum switching valve connector. Disconnect upper intake manifold ground strap. Remove power steering air hose from upper intake manifold. Remove ACIS connector bracket from upper intake manifold. See Figure. Remove accelerator cable bracket from upper intake manifold. Disconnect injector connectors. Remove upper intake manifold and lower intake manifold as an assembly. Remove intake manifold gaskets.
  5. Disconnect vacuum hose from ACIS vacuum switching valve. Disconnect vacuum hose from vacuum tank. Remove nuts, vacuum tank and ACIS vacuum switching valve assembly from lower intake manifold. Remove vacuum hose, screw and ACIS vacuum switching valve from vacuum tank.
  6. Remove vacuum hose, nuts, intake air control valve actuator and gasket from upper intake manifold. Separate upper and lower intake manifolds. Remove IAC valve from upper intake manifold. See Figure.
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