Toyota 17120-50020 Intake Manifold

The upper intake manifold, otherwise known as the Intake Air Surge Tank as used by Toyota, needs the nut on the negative terminals of the battery to be loosened before a cover of the engine, the air intake duct and the air filter housing can be removed. This is followed by coolant hoses from the throttle body where one needs to be, clamped off and disconnected from the nipple, which should be repeated on the other side of the car as well; the EVAP system fuel vapor feed hose should be disconnected along with the ventilation hose and throttle body wiring. Conventional connectors on the Vacuum Switching Valve have to be disconnected, and the bolts of the throttle body bracket needs to be unscrewed so that the bracket is removed. The baffle plate located ahead of the engine coupled with the two intake manifold support brackets referred to as surge tank stays have to be removed together with the bolts and nuts under the intake manifold to unbolster the upper intake manifold. The condition of the upper intake manifold gasket must be ascertained and if it is to be okay it can be put back for use. That is, installation occurs in the reverse sequence so that the mounting bolts, as well as nuts, are tightened to the desired torque. As for the lower intake manifold which Toyota refers to as Intake manifold, the removal of the upper intake manifold is a Sure necessity. When changing the lower intake manifold, the fuel rail is to be removed; whereas, if replacing gaskets only, unbolting the fuel supply/reject connections is enough. The lower intake manifold bolts are then removed to take out the manifold and old gaskets should be thrown away and the two mating surfaces ought to be cleaned well. New gaskets must be used during installation, and the lower INTAKE MANIFOLD BOLTS should be tightened to the specified torque.