Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Installation (RX300)
Using compressed air, clean all passages. Clean throttle body gasket surfaces. Install NEW gaskets, "O" rings and throttle bodies. See Figure. Tighten throttle body screws to specification. See TORQUE SPECIFICATIONS . To complete installation, reverse removal procedure. Fill cooling system with proper mix of water and coolant. If throttle body assemblies were removed from intake air control valve, throttle body lever adjustment may be necessary. See THROTTLE BODY LEVER ADJUSTMENT in ON-VEHICLE ADJUSTMENTS article.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.