Removal (RX300)
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.
NOTE:
On RX300, No. 1 throttle body, No. 2 throttle body and No. 1 air intake air control valve are removed as an assembly. See Fig 1. No. 1 air intake air control valve may also be referred to as No. 3 throttle body.
Disconnect negative battery cable. Drain cooling system. Remove engine cover. Disconnect throttle cable from throttle linkage. Disconnect PCV hose. Remove air cleaner hoses with resonator. Disconnect Throttle Position (TP) sensor. Disconnect Idle Air Control (IAC) valve connector. Disconnect water by-pass hose from intake manifold and from water inlet housing. Disconnect air assist hose. Disconnect fuel vapor hose from emission control valve set. Disconnect vacuum hoses as necessary. Remove throttle body and gasket.