Lexus 17101-20010 Manifold, Intake

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Disconnect the negative cable from the battery. Loosen the air cleaner hose clamp at the throttle body and remove the air cleaner top (four clamps), resonator, and hose. Disconnect the coolant hoses from the throttle body and plug them to prevent coolant leakage. Label and detach any wire harness and control cables or hoses connected to the intake manifold. Press in on the clips to release the wiring harness retainers. Disconnect the two ground straps from the firewall side of the intake manifold, then disconnect the knock sensor. Carefully lift the wire harness over the manifold. Unbolt the intake manifold-to-engine braces. Disconnect the electrical connectors from the coil pack, then remove the mounting bolts and remove the coil pack mount/intake brace. Remove the mounting nuts/bolts, then detach the manifold from the engine. Use a scraper to remove all traces of old gasket material and sealant from the manifold and cylinder head, then clean the mating surfaces with lacquer thinner or acetone. If the gasket was leaking, have the manifold checked for warpage at an automotive machine shop and resurfaced if necessary. Install a new gasket, then position the manifold on the head and install the nuts/bolts. Tighten the nuts/bolts. Work from the center out towards the ends to avoid warping the manifold. Install the remaining parts in the reverse order of removal. Before starting the engine, check the throttle linkage for smooth operation. Check the coolant and add some if necessary to bring it to the appropriate level. Run the engine and check for coolant and vacuum leaks. Road test the vehicle and check for proper operation of all accessories, including the cruise control system.

Remove the air cleaner assembly and disconnect the electrical connectors, vacuum, and coolant bypass hoses from the throttle body. If necessary, remove the throttle body.