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
TORQUE SPECIFICATIONS
| Application | Ft. Lbs. (N.m) |
|---|---|
| Air Intake Plenum | 13 (18) |
| Cold Start Injector Union Bolt | 11 (15) |
| EGR Pipe Bolt/Nut | 13 (18) |
| EGR Valve Adapter | 13 (18) |
| EGR Valve & Vacuum Modulator | 13 (18) |
| Fuel Return Pipe Union Bolt | 26 (35) |
| Idle Speed Control Valve | 13 (18) |
| Intake Manifold Bolt/Nut | 13 (18) |
| Power Brake Booster Union Bolt | 22 (29) |
| Rear Coolant By-Pass Manifold | 13 (18) |
| Starter Bolts | 29 (39) |
| Thermostat Housing | 13 (18) |
| Throttle Body Bolt/Nut | 13 (18) |
| Wire Clamp Nut | 13 (18) |
| INCH Lbs. (N.m) | |
| Cold Start Injector Bolt | 69 (7.5) |
| Fuel Return Pipe Bolt | 69 (7.5) |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.