Throttle Body: Service and Repair

REMOVAL

1. Disconnect negative battery cable.
2. Loosen air cleaner duct hose retaining clamps and remove hose.
3. Remove idle speed control solenoid shield.

Throttle Cable:

4. Disconnect throttle cable and TV cable from throttle body linkage.
5. Mark location and remove vacuum hoses at vacuum tree.
6. Loosen EGR tube nut, if equipped, at EGR Valve and exhaust manifold fitting. Remove or rotate tube out of way.
7. Remove PCV hose from tube underneath throttle body.

Throttle Body Assembly:

8. Disconnect electrical connections to ACT, ISC and Throttle Position Sensors.
9. Remove retaining nuts from alternator brace and remove brace.
10. Loosen and remove six throttle body retaining bolts.
11. Lift and remove throttle body assembly from intake manifold.

INSTALLATION

Intake Plenum Removal/Installation:

NOTE: Lightly oil all bolt and stud threads prior to installation.
1. Clean and inspect the mounting faces of the lower and upper intake manifolds.
2. Position new gasket on lower intake mounting face. The use of alignment studs may be helpful.
3. Install upper intake manifold and throttle body assembly to lower manifold.
4. Aligning bolt holes, install throttle body on intake manifold. Install one stud bolt and five retaining bolts. Tighten to 19 lb ft (25 Nm).
5. Install alternator brace to throttle body and alternator bracket. Tighten nuts to 12 lb ft (16 Nm).
6. Connect PCV hose to tube underneath throttle body.
7. Install EGR tube to EGR Valve and exhaust manifold fitting to 37 lb ft (50 Nm).
8. Connect vacuum hoses.
9. Connect electrical connections to ACT, ISC and Throttle Position Sensor.
10. Connect throttle and TV cables to throttle body linkage.
11. Connect air cleaner duct hose to throttle body and air cleaner assembly. Tighten clamp to 36 lb in (4 Nm).
12. Connect negative battery cable.
13. Start engine and check for vacuum leaks. Adjust idle speed as necessary.
14. Adjust TV cable.
NOTE: This adjustment must be performed if the throttle body assembly is removed for any reason and if throttle plate idle adjustment screw position has been altered.
15. Install shield onto Idle Speed Control Solenoid. Tighten bolts to 13 lb in (1.4 Nm).