THROTTLE BODY
DESCRIPTION
The throttle body mounts to the intake manifold. The throttle position sensor and throttle actuating DC motor are integral to the throttle body. The throttle body is a non serviceable item, replace the throttle body as an assembly.
The throttle blade will not close completely when engine is shut down. This engine off blade position is for start up. The electric throttle body will adjust the throttle blade for idle control as the idle air control valve adjusted idle speed previously on cable actuated throttle bodies. The electric throttle body will also adjust the throttle blade for normal driving operation. The throttle blade will move to the engine off blade position if throttle body codes are set to provide air for limp-in mode.
OPERATION
Filtered air from the air cleaner enters the intake manifold through the throttle body. A throttle valve (plate) is used to supply air for all conditions from idle to wide open throttle.
REMOVAL
1. Remove the engine cover.
2. Remove the negative battery cable.
3. Remove the air cleaner lid, disconnect the inlet air temperature sensor and makeup air hose.
4. Disconnect inlet hose from throttle body.
5. Remove wire harness clip from air tube.
6. Remove the electrical connector from the throttle body.
7. Remove throttle body support bracket and bolts.
8. Bracket removed and bolts.
9. Remove throttle body mounting bolts.
10. Throttle body o-ring (1) and location pins (2).
INSTALLATION
1. Make sure that the throttle body o-ring (1) is in place in the manifold.
2. Position throttle body on intake manifold alignment pins and install 2 mounting bolts. Do Not tighten bolts at this time.
3. Install throttle body bracket.
4. Tighten throttle body bolts in a cross pattern to 9 N·m (79.5 in. lbs.).
5. Throttle body bracket installed.
6. Connect electrical connectors to throttle body.
7. Install air tube and connect wiring harness to air tube.
8. Connect negative battery cable.