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.
1998 Lexus SC 300FACTORY OEM SERVICE PROCEDURE
Idle Speed Specifications
IDLE SPEED SPECIFICATIONS
| Application | Idle RPM |
|---|---|
| All Models | 650-750 |
IGNITION TIMING SPECIFICATIONS
| Application | (1) Base Timing | (2) Controlled Timing | ||||||
|---|---|---|---|---|---|---|---|---|
| ES300 | 8-12 @ 650-750 | 7-24 @ 650-750 | ||||||
| GS300 & SC300 | 8-12 @ 650-750 | 6-16 @ 650-750 | ||||||
| GS400, LS400 & SC400 | 8-12 @ 650-750 | (3) | ||||||
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Factory Service Tools
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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.
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