Toyota 17111-31141 Manifold, Intake

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Disconnect the battery's negative terminal cable, all hoses, and wiring from the throttle body. Label hoses for reassembly. Remove the throttle body bracket, upper intake manifold brace, and air intake tube. Disconnect all wiring and hoses from the manifold, remove the upper intake manifold. Check the gasket's condition, replace if needed. For lower intake manifold removal, remove the fuel rail and interfering brace. Discard old lower intake manifold gaskets, clean off old gasket material from the manifold and cylinder heads. Installation is the reverse of removal, use new gaskets and tighten bolts in a criss-cross pattern from the center outward.

To remove the intake manifold, start by relieving the fuel system pressure and disconnecting the negative battery terminal. Remove the air intake duct, radiator, and cowl cover assembly. For 2009 and earlier models, remove the fuel rail and injectors, throttle linkage, and throttle body from the intake manifold. Label and detach the PCV and vacuum hoses connected to the rear of the intake manifold. Raise the vehicle and remove the manifold lower mounting bolts. From above, remove the intake manifold upper mounting nuts and bolts, along with the manifold, gasket, and manifold insulator. For 2010 and later models, remove the engine cover, disconnect vacuum hoses and ventilation tubes, and remove the throttle body from the intake manifold. Disconnect the fuel intake line from the fuel rail and disconnect the electrical connectors and harness mounting fasteners. Disconnect and remove the main harness connector from the intake manifold and tumble control valves. Apply battery voltage to the tumble control valve electrical connector to close the valve. Remove the intake manifold support bracket and disconnect the vacuum switching valve assembly electrical connector. Unscrew the intake manifold mounting fasteners and remove the manifold. To install, clean the mating surfaces and check for warpage. Press a new gasket into the grooves on the intake manifold and install it over the studs on the cylinder head. Tighten the manifold-to-cylinder head nuts or bolts in three or four equal steps. Install the remaining parts in reverse order and check for coolant and vacuum leaks.

No, it is not necessary to remove the fuel rail when replacing the gaskets on the lower intake manifold. However, the fuel line connection needs to be disconnected.

The fuel rail and injectors are removed as an assembly. The electronic throttle motor connector is disconnected, and the throttle body is removed. Additionally, PCV and vacuum hoses connected to the rear of the intake manifold are labeled and detached.

In the final reassembly, follow these steps:Install the remaining parts in reverse order.Check for coolant and vacuum leaks.These sections provide a step-by-step breakdown of the intake manifold removal and installation process for different models.

Disconnect the accelerator cable or the electronic throttle control system electrical connector.

The initial steps are to relieve the fuel system pressure and disconnect the negative battery cable.

Remove the fuel rail and injectors as an assembly.

Installation is the reverse of removal. Use new gaskets and tighten the lower intake manifold bolts a little at a time, in a criss-cross pattern working from the center bolts outward, to the specified torque.

If you're replacing the lower intake manifold, remove the fuel rail. If you're only replacing the gaskets, it is not necessary to remove the fuel rail, but you will need to disconnect the fuel supply and return line connections.

Remove the air cleaner assembly.