Throttle Body: Service and Repair
Removal:1. Relieve fuel pressure.
2. Disconnect negative cable at battery.
3. Remove air cleaner assembly.
4. Drain cooling system.
WARNING: To help avoid danger of being burned, do not remove drain plug and radiator cap while engine and radiator are still hot. Scalding fluid and steam can be blown out under pressure if plug and cap are taken off too soon.
5. Disconnect following wiring harness couplers:
- Throttle position sensor
- Fuel injector
- Idle speed control actuator
6. Disconnect following hoses from throttle body:
- Fuel feed and return hoses
- Engine cooling water hoses
- Vacuum hoses
7. Disconnect accelerator cable from throttle valve lever.
8. Remove throttle body from intake manifold.
Disassembly:
NOTE:
- Be sure not to remove either fuel pressure regulator or idle speed control motor from throttle body. They are factory adjusted precisely.
- Be sure to replace gaskets and "O" rings as well as worn or damaged parts.
- While disassembling and reassembling the throttle body, use special care not to deform levers on throttle valve shaft of cause damage to any other parts.
1. Remove fuel injector from throttle body.
2. Remove throttle position sensor.
3. After removing screws, separate upper and lower bodies.
Cleaning:
- Clean passages and fuel injector chamber by blowing compressed air.
NOTE:
- Throttle position sensor, fuel pressure regulator, fuel injector, Idle Speed Control (ISC) actuator, other components containing rubber (resin) or throttle valve shaft seal must not be placed in a solvent or cleaner bath. Chemical reaction will cause these parts to swell, harden, or get distorted.
- Don't put drills or wires into passages for cleaning. It causes damage to passages.
Assembly:
1. Install injector subwire and coupler to throttle body.
- Use new "O" ring.
- Tighten subwire coupler screw to specified torque.
Torque: 1.6 - 2.4 Nm (1.2 - 1.7 ft lb)
2. Install new gasket to lower body.
3. Install upper body on gasket, using care not to cause gasket to slip out of place.
4. Make sure to subwire harness to grooves of throttle body and install subwire cover to throttle body.
- Tighten screws to specified torque.
Torque: 2.9 - 4.1 Nm (2.1 - 2.9 ft lb)
5. Install fuel injector.
6. Install throttle position sensor.
Installation:
1. Clean mating surfaces and install throttle body gasket to Early Fuel Evaporation (EFE) heater. Use new gasket.
2. Install throttle body to EFE heater and tighten bolts to specified torque.
Torque: 18 - 28 Nm (13.5 - 20.0 ft lb)
3. Install accelerator cable to throttle valve lever and cable bracket.
4. Connect fuel, cooling water, and vacuum hoses to throttle body. Clamp securely.
5. Connect throttle position sensor and injector coupler securely.
6. Refill cooling system.
7. Connect negative cable at battery.
8. With engine OFF and ignition switch ON, check for fuel leaks around fuel line connections.
9. Install air cleaner assembly.
10. Upon completion of installation, start engine and check for fuel and engine coolant leaks.
- Adjust cable play to specifications.
Accelerator cable play at normal operating temperature
3 - 5 mm (0.12 - 0.20 in)