Removal (3.5L)
1) Relieve fuel pressure. See
FUEL SYSTEM PRESSURE RELEASE (GASOLINE). Disconnect negative battery
cable. Remove injector sight shield. Remove fuel feed pipe quick
connect fitting by squeezing tabs and pulling lines apart. Remove
return pipe quick connecting fitting from fuel rail. Remove vacuum
line from fuel pressure regulator.
2) Remove crankcase ventilation valve hose. Remove throttle
body vacuum port hose. Remove snap bracket on throttle body coolant
tube. Remove engine electrical harness bolts from camshaft covers.
Disconnect fuel injector harness connectors. Release 4 snap locking
tabs on fuel rail assembly by pushing toward camshaft covers and
lifting. Remove fuel rail assembly. See Fig. 21. Remove injector-to-
fuel rail retaining clip. Remove injector from fuel rail. Remove
injector "O" rings and discard.
Installation
To install, reverse removal procedure. Lubricate NEW injector
"O" rings with clean engine oil. Position injectors into fuel rail and
install retaining clips. Position fuel rail into intake manifold
housing. Push down on rail to seat injectors into manifold housing. To
complete installation, reverse removal procedure.
Removal (4.0L)
1) Relieve fuel pressure. See
FUEL SYSTEM PRESSURE RELEASE (GASOLINE). Disconnect fuel feed and
return pipes from fuel rail. Disconnect fuel pressure regulator vacuum
hose.
2) Disconnect Positive Crankcase Ventilation (PCV) air tube
from cam cover. Disconnect PCV valve from cam cover. Remove fuel rail
bracket retainer nut. Disconnect fuel injector electrical connectors
from each fuel injector. Lay harness aside. Remove fuel rail attaching
studs and fuel rail.
Installation
To install, reverse removal procedure. Lubricate NEW injector
"O" rings with clean engine oil. Position injectors into fuel rail and
install retaining clips. To complete installation, reverse removal
procedure.
Removal (4.6L)
1) Relieve fuel pressure. See
FUEL SYSTEM PRESSURE RELEASE (GASOLINE). Disconnect negative battery
cable. Remove intake manifold top cover. See appropriate article in
ENGINES. Disconnect IAT and MAF sensor harness connectors. Remove air
intake duct. Remove fuel rail quick-connect fittings. Remove fuel
pressure regulator vacuum hose. Remove crankcase ventilation air tube.
2) Remove fuel rail end-bracket retaining nuts. Disconnect
fuel injector electrical connectors. Set harness aside. Remove fuel
rail bolts. Raise fuel injectors from intake manifold. Remove fuel
rail and injector assembly. See Fig. 24. Remove injectors from fuel
rail. Remove injector "O" rings and seals, and discard.
WARNING: To reduce the risk of fire and personal injury, ensure fuel
injector "O" rings are installed properly. If "O" rings are
color coded, ensure Black "O" ring is positioned on upper
portion of injector, and Brown "O" ring is positioned on
lower portion of injector. The "O" rings are identical in
size, but are made of different materials.
Installation
To install, reverse removal procedure. Lubricate NEW injector
