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FUEL SYSTEMS 14 - 159 |
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3.3L AND 3.8L MULTI-POINT FUEL INJECTIONÐSERVICE PROCEDURES |
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INDEX |
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page |
Automatic Idle Speed (AIS) Motor . . . . . . . . . . . |
. 160 |
Camshaft Sensor Service . . . . . . . . . . . . . . . . . . |
166 |
Canister Purge Solenoid Service . . . . . . . . . . . . . |
165 |
Crankshaft Timing Sensor . . . . . . . . . . . . . . . . . . |
165 |
Engine Controller Service . . . . . . . . . . . . . . . . . . |
165 |
Fuel Injector . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
164 |
Fuel Injector Rail Assembly . . . . . . . . . . . . . . . . |
161 |
THROTTLE BODY REMOVAL
(1)Disconnect negative battery cable.
(2)Remove the air cleaner to throttle body hose clamp. Remove the nut holding the air cleaner assembly to the air cleaner bracket. Remove the air cleaner (Fig. 1).
(3)Remove throttle and the speed control cables.
(4)Disconnect electrical connectors from the automatic idle speed (AIS) motor and throttle position sensor (TPS).
(5)Disconnect vacuum hoses from throttle body.
(6)Remove throttle body to intake manifold attaching nuts.
(7)Remove throttle body and gasket.
(8)Reverse the above procedure for installation.
Fig. 1 Throttle Body Assembly
THROTTLE BODY
When servicing throttle body components, always reassemble components with new O-rings and seals where applicable (Fig. 2). Never use lubricants on
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page |
Fuel Pressure Regulator . . . . . . . . . . . . . . |
. . . . . 163 |
Fuel System Pressure Release Procedure |
. . . . . 159 |
Heated Oxygen Sensor (O2 Sensor) Service |
. . . . 167 |
Manifold Absolute Pressure (MAP) Sensor |
. . . . . 165 |
Throttle Body . . . . . . . . . . . . . . . . . . . . . . . |
. . . . 159 |
Throttle Body Removal . . . . . . . . . . . . . . . . |
. . . . 159 |
Throttle Position Sensor . . . . . . . . . . . . . . . |
. . . . 159 |
O-rings or seals, damage may result. If assembly of component is difficult, use water to aid assembly. Use care when removing hoses to prevent damage to hose or hose nipple.
FUEL SYSTEM PRESSURE RELEASE PROCEDURE
WARNING: THE 3.3L AND 3.8L MPI FUEL SYSTEMS ARE UNDER A CONSTANT PRESSURE OF APPROXIMATELY 330 KPA (48 PSI). RELEASE FUEL SYSTEM PRESSURE BEFORE SERVICING THE FUEL PUMP, FUEL LINES, FUEL FILTER, THROTTLE BODY OR FUEL INJECTORS.
(1)Loosen fuel filler cap to release fuel tank pres-
sure.
(2)Disconnect injector wiring harness from engine harness (Fig. 3).
(3)Connect a jumper wire between terminal Number 1 of one injector harness and engine ground.
(4)Connect a jumper wire to the positive terminal Number 2 of the injector harness and touch the battery positive post for no longer than 5 seconds. This releases system pressure.
(5)Remove jumper wires.
(6)Continue fuel system service.
THROTTLE POSITION SENSOR
REMOVAL
(1)Disconnect negative cable from battery.
(2)Remove electrical connector from throttle position sensor.
(3)Remove throttle position sensor mounting screws (Fig. 4).
(4)Lift throttle position sensor off throttle shaft.
INSTALLATION
(1)Install throttle position sensor on throttle shaft. Install mounting screws. Tighten screw to 2 NIm (17 in. lbs.) torque.
(2)Connect electrical connector to throttle position sensor.
(3)Connect negative cable to battery.