Removal (GS400)
- Knock sensors are located under intake manifolds on inside center of each cylinder head. To remove knock sensors, remove engine cover. Remove intake air connector pipe. Remove throttle body. See THROTTLE BODY . Disconnect fuel line. Disconnect EVAP vacuum switching valve connector. Remove PCV hose from upper intake manifold.
- Disconnect EVAP vacuum switching valve vacuum hose from EVAP. Remove air inlet hose from air tube. Remove No. 2 engine cover bracket from engine hanger. See Figure. Remove EVAP vacuum switching valve from upper intake manifold. Remove accelerator cable clamp from upper intake manifold. Remove No. 3 engine cover bracket from upper intake manifold.
- Remove bolts and left wire 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 wire protector from rear water bypass joint and right cylinder head.
- Disconnect ACIS vacuum switching valve connector. Disconnect upper intake manifold ground strap. Remove power steering hose from upper intake manifold. Remove ACIS connector bracket from upper intake manifold.
- Remove accelerator cable bracket from upper intake manifold. Disconnect injector connectors. Remove bolts, nuts, upper intake manifold, lower intake manifold assembly and gaskets. Disconnect knock sensor connector and remove knock sensors.