The throttle body assembly controls air flow to the engine through a single butterfly-type valve. The throttle position is controlled by conventional cable/cam throttle linkage. The body is a single-piece die casting made of aluminum. It has a single bore with an air bypass channel around the throttle plate. This bypass channel controls both cold and warm engine idle air flow control as regulated by an air bypass valve assembly mounted directly to the throttle body. The valve assembly is an electromechanical device controlled by the EEC computer. It incorporates a linear actuator which positions a variable area metering valve.
Other features of the air throttle body assembly include:
REMOVAL & INSTALLATION
See Figure 1
- Remove the four throttle body nuts. Make sure that the throttle position sensor connector and the air bypass valve connector have been disconnected from the harness. Disconnect the air cleaner outlet tube.
- Identify and disconnect the vacuum hoses.
- Remove the throttle bracket.
- Carefully separate the throttle body from the upper intake manifold.
- Remove and discard the gasket between the throttle body and the upper intake manifold.
- Installation is the reverse of removal. Tighten the throttle body-to-upper intake manifold nuts 12-15 ft. lbs.