Question 1

How to remove and install an intake manifold on Four cylinder engine on Lexus ES300?

Accepted Answer

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.

Question 2

How to remove and install an intake manifold on V6 engine on Lexus ES350?

Accepted Answer

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.

Question 3

How to remove and install Intake Manifold in Four cylinder engine on Lexus RX350?

Accepted Answer

To remove the intake manifold, first relieve the fuel system pressure and disconnect the cable from the negative battery terminal. Next, remove the air intake duct and resonator, followed by the cowl cover assembly. Then, take out the fuel rail and injectors as an assembly. For models from 1999 to 2007, remove the throttle linkage and throttle body from the intake manifold, label and detach the PCV and vacuum hoses connected to the intake manifold, and securely support the vehicle on jackstands. If working on a 4WD model, loosen the right side driveaxle/hub nut and the right front wheel lug nuts before raising the vehicle. Drain the transfer case lubricant, remove the right side driveaxle, and separate the transfer case mount from the transfer case, removing the transfer case mounting brace. For all models, work below the vehicle to remove the manifold lower mounting bolts, then from above, remove the intake manifold upper mounting nuts and bolts, and take out the manifold, gasket, and manifold insulator from the engine. For models from 2008 and later, remove the engine cover, disconnect the vacuum hoses and ventilation tubes from the intake manifold, and remove the throttle body with the electronic throttle actuator. Additionally, remove the windshield wiper motor, brake booster vacuum bracket, and outer cowl top assembly, then disconnect and remove the main harness connector to the intake manifold and tumble control valves. Apply battery voltage to the tumble control valve electrical connector to close the valve, preventing damage during removal. Remove the intake manifold support bracket and disconnect the vacuum switching valve assembly electrical connector, then unscrew the intake manifold mounting fasteners and remove the manifold. For installation, clean the mating surfaces of the intake manifold and cylinder head mounting surface, checking the gasket for leaks and the manifold for warpage. Press a new gasket into the grooves on the intake manifold, install the manifold and gasket over the studs on the cylinder head, and tighten the manifold-to-cylinder head nuts/bolts in three or four equal steps from the center outwards. Reinstall the remaining parts in reverse order, check the coolant level, refill the transfer case for 4WD models, and ensure the throttle linkage operates smoothly before starting the engine to check for coolant and vacuum leaks.

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