Section 03-04B: Fuel Charging and Controls, 5.0L and 5.8L Engines | 1996 Vehicles Equipped with 5.0L and 5.8L SFI V-8 Engines Workshop Manual |
DESCRIPTION AND OPERATION
Throttle Body
The throttle body (9E926) controls airflow to the engine (6007) through a double butterfly-type valve. The throttle position is controlled by a multiple-link, progressive opening throttle linkage. The throttle body is a single-piece die casting made of aluminum. It has a dual bore with an air bypass channel around the throttle plate. This bypass channel controls both cold and warm engine idle airflow as regulated by an idle air control valve (IAC valve) (9F715) assembly mounted directly to the throttle body. The idle air control valve assembly is an electromechanical device, controlled by the powertrain control module (PCM) (12A650) that meters the amount of air bypassed around the throttle plates in order to control engine idle speed. Engine coolant is diverted through the throttle body mounting pad to improve cold weather operation.
Other features of the throttle body include:
A preset stop to locate the wide-open throttle (WOT) position.
A throttle body-mounted throttle position sensor (TP sensor) (9B989).
A sealant/coating that is applied to the downstream side of the throttle body plate and bore to minimize closed plate to bore airflow. This sealant/coating should not be removed or cleaned.
Upper Intake Manifold and Throttle Body Assemblies
| Item | Part Number | Description |
|---|
| 1 | N803469-S100 | Screw and Washer Assembly (2 Req'd) |
| 2 | 9B989 | Throttle Position Sensor |
| 3 | 56524-S8 | Bolt, 5/16-18 x 1.5 (4 Req'd) |
| 4 | 9E936 | Throttle Body Gasket |
| 5 | 9424 | Intake Manifold, Upper |
| 6 | 391252-S2 | Screw |
| 7 | N605733-S100 | Bolt, M6 x 20 |
| 8 | 9F715 | Idle Air Control Valve |
| 9 | 9F670 | IAC Valve Gasket |
| A | — | Tighten to 1-2 Nm
(9-18 Lb-In) |
| B | — | Tighten to 16-24 Nm
(12-18 Lb-Ft) |
Throttle Body, 5.8L SFI, 5.0L SFI Similar
