THROTTLE BODY
DESCRIPTION
The throttle body is located on the intake manifold.
Fuel does not enter the intake manifold through the
throttle body. Fuel is sprayed into the manifold by
the fuel injectors.
OPERATION
Filtered air from the air cleaner enters the intake
manifold through the throttle body. The intake man-
ifold contains an air control passage controlled by an
Idle Air Control (IAC) motor. The air control passage
is used to supply air for idle conditions. A pintle
valve is used to supply air for above idle conditions.
The throttle position sensor (TPS) is attached to
the throttle body. The accelerator pedal cable is con-
nected to the throttle body linkage arm.
A (factory adjusted) set screw is used to mechani-
cally limit the position of the throttle body throttle
plate. Never attempt to adjust the engine idle
speed using this screw. All idle speed functions are
controlled by the PCM.
REMOVAL
(1) Remove the battery cover and disconnect the
negative battery cable.
(2) Remove the air cleaner assembly, refer to the
Engine/Air Intake System/Air Cleaner Housing for
more information.
(3) Remove the throttle cable (Fig. 18).
(4) Disconnect the TPS electrical connector (Fig.
19).
(5) Remove the throttle body bolts (Fig. 20) and
wiring clips (Fig. 21).
(6) Remove the throttle body.
Fig. 18 THROTTLE CABLE AT THROTTLE BODY
Fig. 19 TPS & IDLE AIR CONTROL
1 - Throttle Position Sensor
2 - Idle Air Control Motor
3 - Fuel Rail
4 - Connector Fuel Line for Fuel Rails
Fig. 20 THROTTLE BODY
ZB FUEL INJECTION 14 - 39
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