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.
2003 Lexus GS 430FACTORY OEM SERVICE PROCEDURE
Service Data
IGNITION COMPONENTS SERVICE SPECIFICATIONS (3UZ-FE)
| Firing order | 1-8-4-3-6-5-7-2 | ||
| Spark plug | Recommended spark plug | ND made NGK made |
SK20R11 IFR6A11 |
| Correct electrode gap for new spark plug | 1.1 mm (0.043 in.) | ||
| Maximum electrode gap for used spark plug | 1.3 mm (0.051 in.) | ||
| Camshaft position sensor | Resistance | Cold Hot |
835 - 1,400 ohm 1,060-1,645 ohm |
| Crankshaft position sensor | Resistance | Cold Hot |
1,630-2,740 ohm 2,065-3,225 ohm |
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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