EMISSION CONTROLS AND FUEL SYSTEM 175
REAR
TBI UNIT
FUEL PRESSURE
COMPENSATOR
INJECTOR METERING
VALVE
FUEL
INJECTOR
FUEL INLET LINE
(FROM FUEL PUMP)
FRONT
TBI UNIT
TBI fuel flow schematic
cedures to remove the TBI unites) and replace
the defective components).
REMOVAL AND INSTALLATION
Front TBI Unit
1. Disconnect the battery cables at the
battery.
2. Remove the air cleaner assembly, not
ing the connection points of the vacuum lines.
3. Disconnect the electrical connectors at
the injector and the idle air control motor.
4. Disconnect the vacuum lines from the
TBI unit, noting the connection points. Dur
ing installation, refer to the underhood emis
sion control information decal for vacuum line
routing information.
5. Disconnect the transmission detent ca
ble from the TBI unit.
6. Disconnect the fuel inlet (feed) and fuel
balance line connections at the front TBI unit.
7. Disconnect the throttle control rod be
tween the two TBI units.
8. Unbolt and remove the TBI unit.
9. Installation is the reverse of the pre
vious steps. Torque the TBI bolts to 120-168
inch Ibs. during installation.
1. Front TBI unit
2. Rear TBI unit
3. Idle air control (IAC) motors
4. Fuel injectors
5. Fuel balance line
6. Fuel return line
Throttle Body Injection (TBI) system nomenclature
FUEL PRESSURE REGULATOR
FUEL
INJECTOR
FUEL
RETURN LINE
(
TO FUEL TANK
]
