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 IS 300 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Torque Specification
TIGHTENING TORQUE SPECIFICATION
| Part tightened | N.m | kgf.cm | ft.lbf |
|---|---|---|---|
| Spark plug x Cylinder head | 18 | 180 | 13 |
| Throttle body x Intake air connector | 21 | 210 | 15 |
| Throttle body bracket x Cylinder head | 21 | 210 | 15 |
| Throttle body bracket x Throttle body | 21 | 210 | 15 |
| Throttle body gasket x Intake air connector | 21 | 210 | 15 |
| Ignition coils and high-tension cord set assembly x Cylinder head | 8.0 | 80 | 71 in.lbf |
| PS pump rear stay x Manifold stay | 39.2 | 400 | 29 |
| PS pump rear stay x PS pump bracket | 39.2 | 400 | 29 |
| Camshaft position sensor x Cylinder head | 9.0 | 90 | 80 in.lbf |
| Crankshaft position sensor x Oil pump | 9.0 | 90 | 80 in.lbf |
Factory Service Tools
Use the Manual With the Right Hardware
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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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