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.
1994 Lexus SC 400FACTORY OEM SERVICE PROCEDURE
Cold Start Injector: Removal
- Relieve fuel pressure. See FUEL SYSTEM PRESSURE RELEASE. Disconnect negative battery cable. Drain cooling system. Remove throttle body cover. Remove air cleaner with airflow meter.
- Disconnect throttle cables from throttle body. Disconnect air hoses from Idle Air Control (IAC) valve and power steering air control valve. Remove throttle body air duct hose. Remove high tension wire upper cover. See Figure. Remove both engine wire harness covers.
- Mark and disconnect vacuum hoses and wiring harness connectors as necessary. Remove right and left No. 3 timing belt covers. Remove high tension wire lower cover. Disconnect coolant hose from heater valve. Disconnect by-pass hoses from Idle Air Control (IAC) valve and throttle body. Remove PCV hose from throttle body. Remove throttle body and gasket.
- Disconnect brake booster hose from intake chamber. Remove throttle cable bracket. Disconnect cold start injector fuel delivery pipe. Disconnect EGR pipe from air intake chamber, and remove gasket. Disconnect Data Link Connector (DLC) bracket from air intake chamber.
- Remove 4 bolts, 8 nuts and air intake chamber. Disconnect cold start injector connector. Remove banjo bolt, cold start injector tube and 2 gaskets. Remove 2 bolts, cold start injector and gasket.
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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