Idle Speed/Throttle Actuator - Electronic: Service and Repair

Figure 4C-8 Upper And Lower Intake Components:

Legend:
1. Manifold Assembly - Upper
2. Stud - Upper Inlet Manifold
3. Harness Assembly - EGR Valve and Fuel Pressure Regulator Vacuum
4. Seal - MAP sensor
5. Sensor- Manifold Absolute Pressure (MAP)
6. Bolt - MAP Sensor Attaching
7. Fitting and Washer Assembly - EGR Transfer Tube
8. Valve Assembly - Idle Air Control (IAC)
9. Screw - AC Valve Attaching
10. 0-Ring - IAC Valve
11. Tube Assembly - EGR transport
12. Bolt - Upper Inlet Manifold
13. Gasket - Upper Inlet Manifold
14. Fitting - Power Brake
15. 0-Ring - Fuel Inject or Upper
16. Injector Assembly - (Bottom Feed) SFI Fuel injectors
17. 0-Ring - Fuel Injector Lower
18. Screw - Fuel Pressure Connection Fitting
19. Bracket - Fuel Pressure Connection Fitting
20. Fitting - Fuel Feed
21. 0-Ring - Fuel Feed Pipe Fitting
22. 0-Ring - Fuel Feed Pipe Fitting
23. Pipe Assembly - Fuel Feed
24. Manifold Assembly - Lower
25. Retainer - Injectors
26. Screw - Injectors Retainer Attaching
27. Screw - TP Sensor Attaching
28. Sensor - Throttle Position (TP)
29. Pipe Assembly - Fuel Return
30. 0-Ring - Fuel Return Pipe Fitting
31. Screen - Filter (if so equipped)
32. 0-Ring - Fuel Pressure Regulator
33. Screw - Fuel Pressure Regulator Attaching
34. Regulator Assembly - Fuel Pressure

REMOVE OR DISCONNECT
1. Electrical connector.
2. Idle Air Control (IAC) valve attaching screws.
3. IAC valve assembly.

NOTE: If IAC valve has been in service: Do Not push or pull on the IAC valve pintle. The force required to move the pintle may damage the threads on the worm drive. Also, Do Not soak IAC valve in any liquid cleaner or solvent, as damage may result.

CLEAN AND INSPECT
- Clean IAC valve 0-ring sealing surface, pintle valve seat, and air passage.
- Use carburetor cleaner and a parts cleaning brush to remove carbon deposits. Do Not use a cleaner containing methyl ethyl ketone.
- Shiny spots on the pintle or seat are normal and do not indicate misalignment or a bent pintle shaft.
- If air passage has heavy deposits, remove upper manifold assembly for complete cleaning.
- Inspect IAC valve 0-ring for cuts, cracks, or distortion. Replace if damaged.

IMPORTANT: If installing a new IAC valve, replace the IAC valve with an identical part. IAC valve pintle shape and diameter are designed for the specific application.

Figure 4C-7 Idle Air Control (IAC) Valve:

MEASURE (If Installing a New IAC Valve)
- Distance between tip of IAC valve pintle and mounting flange (reference "A" in figure).
- If greater than 28 mm, use finger pressure to slowly retract the pintle. The force required to retract the pintle of a new valve will not cause damage to the valve.

INSTALL OR CONNECT
1. Lubricate IAC valve 0-ring with clean engine oil.
2. IAC valve assembly.
3. Attaching screws coated with appropriate thread-locking material.

Tighten IAC valve attaching screws to 3.0 Nm (27 in. lbs.).

4. Electrical connector.

IMPORTANT: The hardware used to attach the Idle Air Control (IAC) valve is coated with thread-locking adhesive. If any these parts are removed for service, inspect the attaching screw threads. There should be enough thread-locking material (adhesive or compound) on the threads to ensure proper relocking. If not, clean the threads and apply a thread locking adhesive to the threads before reassembly. Replacement screws are included in the service packages.