Removal (LX470)
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 Lexus SC 430, 2002 Lexus RX 300, 2002 Lexus LX 470, 2002 Lexus LS 430, and 2002 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.
- Intake manifold must be removed to access knock sensors. Knock sensors are located on cylinder block under intake manifold. Intake manifold consists of an upper and lower intake manifold.
- Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE under FUEL SYSTEM. Remove engine cover. Remove air intake hose with intake air connector located between throttle body and air cleaner assembly.
- Remove throttle body from intake manifold. See THROTTLE BODY under FUEL SYSTEM. Depress both sides of retainer and pull fuel inlet hose with disconnect fitting from fuel filter. See Figure.
- Disconnect necessary electrical connectors, fuel return hose, vacuum hoses, PCV hose and wiring clamps for removal of intake manifold. Remove bolts and disconnect engine wiring harness protector from rear of water bypass joint and right cylinder head. Disconnect ground straps at rear of cylinder heads.
- Disconnect engine wiring harness protector from top of intake manifold. See Figure. Remove EVAP pipe from rear of intake manifold. Remove engine cover brackets. Remove bolts/nuts that secure lower section of intake manifold to cylinder heads.
- Remove intake manifold with fuel injectors and fuel rails as an assembly. Remove intake manifold gaskets. Disconnect electrical connectors at knock sensors. Using Socket (SST 09816-30010), remove knock sensor(s) from cylinder block.