Throttle Body Fuel Injection Unit Replacement

Disconnecting TBI Unit:

Description:

TBI Unit Component View:

Description:

THROTTLE BODY FUEL INJECTION UNIT REPLACEMENT

REMOVE OR DISCONNECT
^ Relieve fuel system pressure. Refer to Fuel Pressure Relief Procedure under Service and Repair / Fuel System Pressure Relief Procedure. Service and Repair

1. One nut, one bolt, [1][2]PCV hose, Intake Air Temperature (IAT) sensor connector and Air Cleaner (ACL) from Throttle Body Fuel Injection (TBI) unit.
^ Drain cooling system. Refer to Cooling System / Service and Repair. Service and Repair
2. Throttle Position (TP) sensor electrical connector.
3. Fuel injector electrical connector.
4. Idle Speed Control (ISC) motor electrical connector.
5. One clamp and fuel feed hose from TBI unit.
6. One clamp and fuel return hose from TBI unit.
7. Two clamps and two engine coolant hoses from TBI unit.
8. Vacuum hoses from TBI unit.
9. Two bolts and accelerator cable from throttle valve lever and cable bracket.
10. Four bolts and TBI unit from Early Fuel Evaporation (EFE) heater.

DISASSEMBLE

IMPORTANT: Be sure not to remove the fuel pressure regulator valve or the ISC motor from the TBI unit They are not serviceable. They are calibrated at the factory and are not adjustable.

1. Two bolts and ACL bracket from TBI unit.
2. Two screws and injector cover with electrical connector from TBI unit.
3. Fuel injector from TBI unit.
4. Two screws and TP sensor from TBI unit.
5. Two screws, separating upper and lower sections of TBI unit.

CLEAN
^ Passages and fuel injector chamber with an air nozzle.

IMPORTANT:
^ TP sensor, fuel pressure regulator, fuel injector, ISC motor, and other components containing rubber or throttle shaft seals must not be placed in solvents or cleaner bath. Chemical reactions to these pans may result in damage to the component.
^ Do not use drills or wire brushes to clean air passages. Damage may result to the passages.

1. New gasket to TBI unit.
2. Upper TBI unit to lower TBI unit; secure with two screws. Tighten TBI unit attaching screws to 3.5 Nm (31 lb. in.).
3. TP sensor to TBI unit; secure with two screws. Do not tighten fully.
4. Fuel injector to TBI unit
5. Injector cover to TBI unit, connecting electrical connector; secure with two screws.
6. ACL bracket to TBI unit; secure with two bolts. Tighten ACL bracket bolts to 15 Nm (11 lb. ft.).

INSTALL OR CONNECT

Description:

CLEAN
^ EFE heater-to-TBI unit mating surfaces.

1. New gasket to EFE heater.
2. TBI unit to EFE heater; secure with four bolts. Tighten TBI unit bolts to 23 Nm (17 lb ft).
3. Accelerator cable to throttle lever and bracket; secure with two bolts. Do not tighten fully.
4. Vacuum hoses to TBI unit.
5. Two engine coolant hoses to TBI unit; secure each hose with clamp.
6. Fuel return hose to TBI unit; secure with clamp.
7. Fuel feed hose to TBI unit; secure with clamp.
8. Fuel injector electrical connector.
9. TP sensor and ISC motor electrical connectors.
10. [1][2]PCV hose, IAT sensor electrical connector and ACL to TBI unit; secure with one bolt and one nut.Tighten ACL bolt to 15 Nm (11 lb ft).
11. Negative (-) battery cable. Tighten Negative (-) battery cable-to-negative (-) battery terminal retainer to 15 Nm (11 lb. ft.).

COOLING SYSTEM
^ Replenish coolant system to proper level. Refer to Cooling System / Service and Repair.

FUEL SYSTEM INSPECTION
^ Turn ignition switch to "ON," then back to "LOCK" to pressurize the fuel system. Check for any fuel leaks.

ADJUST
1. Accelerator cable. Refer to Throttle Cable / Linkage / Adjustments. Adjustments

2. TP sensor. Refer to Computers and Control Systems / Throttle Position Sensor / Adjustments. Adjustments