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.
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HOMESERVICE MANUALSLEXUS1998SC 300REPAIR AND DIAGNOSISENGINE PERFORMANCEENGINE CONTROLS - ADJUSTMENTSTHROTTLE OPENER
1998 Lexus SC 300
Throttle Opener
1998 Lexus SC 300SECTION Throttle Opener
- On all except ES300, for testing and adjustment procedures, see THROTTLE CONTROLS in SYSTEM/COMPONENT TESTS article.
- On ES300, warm engine to normal operating temperature. Ensure idle speed is 650-750 RPM. Disconnect vacuum hose from throttle opener, and plug hose end. Run engine at 2500 RPM then release throttle. Throttle opener set speed should be 900-1950 RPM. If throttle opener set speed is not as specified, replace throttle body.
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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.