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.
1990 Lexus LS 400FACTORY OEM SERVICE PROCEDURE
Torque Specifications (LS400)
LS400 TORQUE SPECIFICATIONS
| Application | Ft. Lbs. (N.m) |
|---|---|
| Cold Start Injector Tube | 11 (15) |
| Front Fuel Pipe Banjo Bolt | 22 (29) |
| Fuel Pressure Regulator Lock Nut | 24 (32) |
| Fuel Rail Nuts | 13 (18) |
| Fuel Return Pipe | 22 (29) |
| Intake Air Chamber Bolts & Nuts | 13 (18) |
| Pulsation Damper | 22 (29) |
| Rear Fuel Pipe Banjo Bolt | 22 (29) |
| Vacuum Switching Valve (VSV) | 13 (18) |
| INCH Lbs. (N.m) | |
| Accelerator Cable Bracket | 69 (7.8) |
| Air Pipe Bolts | 69 (7.8) |
| Cold Start Injector Bolts | 43 (4.9) |
| Fuel Pump-to-Tank Bolts | 30 (3.4) |
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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