Page 2769 of 4284

(4) Position upper manifold on lower manifold (Fig.
127). Install and tighten bolts to 12 N´m (105 in. lbs.)
following torque sequence in (Fig. 128).(5) Connect the MAP sensor electrical connector.
(Refer to 14 - FUEL SYSTEM/FUEL INJECTION/
MAP SENSOR - COMPONENT LOCATION)
(6) Connect the brake booster and LDP vacuum
hose to intake manifold (Fig. 126).
CAUTION: The special screws used for attaching
the EGR tube and power steering reservoir to the
manifold must be installed slowly using hand tools
only. This requirement is to prevent the melting of
material that causes stripped threads. If threads
become stripped, an oversize repair screw is avail-
able. For more information and procedure (Refer to
9 - ENGINE/MANIFOLDS/INTAKE MANIFOLD - STAN-
DARD PROCEDURE).
(7) Install the power steering reservoir (Fig. 125).
Tighten screws to manifold to 5.6 N´m (50 in. lbs.).
(8) Using new gaskets, install the EGR tube and
torque bolts to 5.6 N´m (50 in. lbs.).
(9) Connect the EGR transducer vacuum hose.
(10) Install throttle and speed control cables.
(Refer to 14 - FUEL SYSTEM/FUEL INJECTION/
THROTTLE CONTROL CABLE - INSTALLATION)
(11) Attach make up air hose clip into the hole in
the throttle cable bracket.
(12) Connect the wiring connectors to the throttle
position sensor (TPS) and Automatic Idle Speed (AIS)
motor. (Refer to 9 - ENGINE/MANIFOLDS/INTAKE
MANIFOLD - COMPONENT LOCATION)
(13) Install air cleaner and air inlet hose assembly.
(14) Connect the inlet air sensor electrical connec-
tor. (Refer to 14 - FUEL SYSTEM/FUEL INJEC-
TION/INLET AIR TEMPERATURE SENSOR -
COMPONENT LOCATION)
(15) Connect battery negative cable.
INTAKE MANIFOLD - UPPER
3.8L
REMOVAL - 3.8L
(1) Disconnect battery negative cable.
(2) Disconnect air inlet sensor electrical connector.
(Refer to 14 - FUEL SYSTEM/FUEL INJECTION/IN-
LET AIR TEMPERATURE SENSOR - COMPONENT
LOCATION)
(3) Remove air inlet resonator to throttle body
hose assembly.
(4) Remove throttle and speed control cables.
(Refer to 14 - FUEL SYSTEM/FUEL INJECTION/
THROTTLE CONTROL CABLE - REMOVAL)
(5) Disconnect make-up air hose support clip from
throttle cable bracket.
(6) Disconnect the automatic idle speed (AIS)
motor and throttle position sensor (TPS) wiring con-
Fig. 127 INTAKE MANIFOLD - UPPER 3.3L
1 - BOLT
2 - MAP SENSOR
3 - SCREW
4 - MANIFOLD - UPPER
5 - WIRE HARNESS
6 - GASKET (3 PER CYL. BANK)
Fig. 128 UPPER MANIFOLD TIGHTENING
SEQUENCE
RSENGINE 3.3/3.8L9 - 145
INTAKE MANIFOLD - UPPER 3.3L (Continued)
Page 2770 of 4284

nectors from throttle body. (Refer to 9 - ENGINE/
MANIFOLDS/INTAKE MANIFOLD - COMPONENT
LOCATION)
(7) Disconnect the manifold absolute pressure
(MAP) sensor electrical connector. (Refer to 14 -
FUEL SYSTEM/FUEL INJECTION/MAP SENSOR -
COMPONENT LOCATION)
(8) Disconnect the EGR transducer vacuum hose
from bottom of upper intake manifold (Fig. 129).
(9) Remove the EGR tube (Fig. 129).
(10) Disconnect the vapor purge vacuum hose from
throttle body.
(11) Disconnect the PCV hose (Fig. 130).
(12) Remove the power steering reservoir attach-
ing bolts and loosen the nut only (Fig. 131). Lift res-
ervoir up to disengage lower mount from stud. Set
reservoir aside.Do notdisconnect hose.
(13) Disconnect the brake booster and leak detec-
tion pump (LDP) hoses from intake manifold (Fig.
132).
(14) Remove intake manifold bolts and remove the
manifold (Fig. 133).
(15) Cover the lower intake manifold with a suit-
able cover when servicing.
(16) Clean and inspect the upper intake manifold.
(Refer to 9 - ENGINE/MANIFOLDS/INTAKE MANI-
FOLD - CLEANING) (Refer to 9 - ENGINE/MANI-
FOLDS/INTAKE MANIFOLD - INSPECTION)
CLEANING
(1) Discard gasket(s).
(2) Clean all sealing surfaces.
Fig. 129 EGR COMPONENTS - 3.8L
1 - EGR TUBE WITH BOLTS
2 - EGR VALVE ASSEMBLY
Fig. 130 PCV & HOSE
1 - HOSE - PCV
2 - P C V VA LV E
Fig. 131 POWER STEERING FLUID RESERVOIR
1 - POWER STEERING RESERVOIR
2 - BOLT - RESERVOIR TO MANIFOLD
3 - NUT - RESERVOIR TO COIL BRACKET
9 - 146 ENGINE 3.3/3.8LRS
INTAKE MANIFOLD - UPPER 3.8L (Continued)
Page 2771 of 4284

INSPECTION
Check manifold for:
²Damage and cracks.
²Mounting surface distortion by using a straight-
edge and thickness gauge.
INSTALLATION - 3.8L
(1) If the following components were removed from
manifold, install and tighten to specifications:
²MAP sensor - 3.4 N´m (30 in. lbs.)
²Throttle cable bracket - 12 N´m (105 in. lbs.)
(2) Remove covering on lower intake manifold and
clean surfaces.
(3) Position the new intake manifold gasket on
lower manifold.
(4) Position upper manifold on lower manifold (Fig.
133). Install and tighten bolts to 12 N´m (105 in. lbs.)
following torque sequence in (Fig. 134).
(5) Connect the MAP sensor electrical connector.
(Refer to 14 - FUEL SYSTEM/FUEL INJECTION/
MAP SENSOR - COMPONENT LOCATION)
(6) Connect the brake booster and LDP vacuum
hose to intake manifold (Fig. 132).
(7) Connect the PCV hose (Fig. 130).
(8) Install the power steering reservoir (Fig. 131)
and torque fasteners to 12 N´m (105 in. lbs.).
(9) Connect the EGR transducer vacuum hose.
(10) Using new gaskets, install the EGR tube (Fig.
129) and torque bolts to 12 N´m (105 in. lbs.).
Fig. 132 BRAKE BOOSTER & LDP VACUUM HOSES
1 - LDP & SPEED CONTROL VACUUM HOSE
2 - BRAKE BOOSTER VACUUM HOSE
3 - MAP SENSOR
Fig. 133 INTAKE MANIFOLD - UPPER 3.8L
1 - BRACKET - THROTTLE CABLE
2 - BOLT
3 - SCREW
4 - MAP SENSOR
5 - MANIFOLD - UPPER
6 - WIRE HARNESS
7 - GASKET (1 PER CYL. BANK)
8 - BOLT
Fig. 134 UPPER MANIFOLD TIGHTENING
SEQUENCE
RSENGINE 3.3/3.8L9 - 147
INTAKE MANIFOLD - UPPER 3.8L (Continued)
Page 2772 of 4284

(11) Install throttle and speed control cables.
(Refer to 14 - FUEL SYSTEM/FUEL INJECTION/
THROTTLE CONTROL CABLE - INSTALLATION)
(12) Attach make up air hose clip into the hole in
the throttle cable bracket.
(13) Connect the vapor purge vacuum hose to
throttle body.
(14) Connect the wiring connectors to the throttle
position sensor (TPS) and Automatic Idle Speed (AIS)
motor. (Refer to 9 - ENGINE/MANIFOLDS/INTAKE
MANIFOLD - COMPONENT LOCATION)
(15) Install air cleaner and air inlet hose assembly.
(16) Connect the inlet air sensor electrical connec-
tor. (Refer to 14 - FUEL SYSTEM/FUEL INJEC-
TION/INLET AIR TEMPERATURE SENSOR -
COMPONENT LOCATION)
(17) Connect battery negative cable.
INTAKE MANIFOLD - LOWER
REMOVAL
(1) Perform fuel system pressure release procedure
(before attempting any repairs).(Refer to 14 -
FUEL SYSTEM/FUEL DELIVERY - STANDARD
PROCEDURE)
(2) Drain the cooling system. (Refer to 7 - COOL-
ING - STANDARD PROCEDURE)
(3) Remove the upper intake manifold. (Refer to 9
- ENGINE/MANIFOLDS/INTAKE MANIFOLD -
REMOVAL)
(4) Remove the fuel line. (Refer to 14 - FUEL SYS-
TEM/FUEL DELIVERY/FUEL LINES - STANDARD
PROCEDURE) (Refer to 14 - FUEL SYSTEM/FUEL
DELIVERY/QUICK CONNECT FITTING - STAN-
DARD PROCEDURE)
(5) Remove ignition coil and bracket (Fig. 135).
(6) Disconnect heater supply hose and engine cool-
ant temperature sensor (Fig. 136).
(7) Disconnect the fuel injector wire harness.
(8) Remove the fuel injectors and rail assembly
(Fig. 135).
(9) Remove radiator upper hose.
(10) Remove the intake manifold bolts.
(11) Remove lower intake manifold (Fig. 137).
WARNING: INTAKE MANIFOLD GASKET IS MADE
OF VERY THIN METAL AND MAY CAUSE PER-
SONAL INJURY, HANDLE WITH CARE.
(12) Remove intake manifold seal retainers screws
(Fig. 137). Remove intake manifold gasket.
(13) Inspect and clean manifold. (Refer to 9 -
ENGINE/MANIFOLDS/INTAKE MANIFOLD -
INSPECTION) (Refer to 9 - ENGINE/MANIFOLDS/
INTAKE MANIFOLD - CLEANING)
CLEANING
(1) Discard gasket(s).
(2) Clean all sealing surfaces.
INSPECTION
Check for:
²Damage and cracks of each section.
²Clogged water passages in end cross-overs (if
equipped).
²Check for cylinder head mounting surface distor-
tion using a straightedge and thickness gauge. (Refer
to 9 - ENGINE/CYLINDER HEAD - INSPECTION)
Fig. 135 FUEL RAIL AND IGNITION COIL &
BRACKET
1 - FUEL RAIL
2 - BOLT - FUEL RAIL
3 - NUT - IGNITION COIL
4 - BOLT - IGNITION COIL
5 - IGNITION COIL
6 - BRACKET - IGNITION COIL
7 - STUD - IGNITION COIL
8 - SEPARATOR - SPARK PLUG CABLE
9 - BRACKET - SPARK PLUG CABLE SEPARATOR
10 - BOLT - SEPARATOR BRACKET
11 - BRACKET - SPARK PLUG CABLE SEPARATOR
9 - 148 ENGINE 3.3/3.8LRS
INTAKE MANIFOLD - UPPER 3.8L (Continued)
Page 2773 of 4284

INSTALLATION
(1) Place a bead (approximately 1/4 in. diameter)
of MopartEngine RTV GEN II onto each of thefour
manifold to cylinder head gasket corners (Fig. 138).
(2) Carefully install the new intake manifold gas-
ket (Fig. 139). Tighten end seal retainer screws to 12
N´m (105 in. lbs.).
(3) Install lower intake manifold (Fig. 139). Install
the bolts and torque to 1 N´m (10 in. lbs.). Then
torque bolts to 22 N´m (200 in. lbs.) in sequence
shown in (Fig. 140). Then torque again to 22 N´m
(200 in. lbs.). After intake manifold is in place,
inspect to make sure seals are in place.
(4) Install the fuel injectors and rail assembly.
(Refer to 14 - FUEL SYSTEM/FUEL DELIVERY/
FUEL RAIL - INSTALLATION)
(5) Connect fuel injector electrical harness.
(6) Connect the engine coolant temperature sensor
(Fig. 136).
(7) Connect the heater supply (Fig. 136) and radi-
ator upper hoses to manifold.
(8) Connect the fuel line. (Refer to 14 - FUEL SYS-
TEM/FUEL DELIVERY/QUICK CONNECT FIT-
TING - STANDARD PROCEDURE)
(9) Install the upper intake manifold. (Refer to 9 -
ENGINE/MANIFOLDS/INTAKE MANIFOLD -
INSTALLATION)
(10) Connect negative battery cable.(11) Fill the cooling system. (Refer to 7 - COOL-
ING - STANDARD PROCEDURE)
Fig. 136 ECT SENSOR & HEATER SUPPLY
1 - ENGINE COOLANT TEMPERATURE SENSOR
2 - CONNECTOR - ENGINE COOLANT SENSOR
3 - FITTING - HEATER SUPPLY
Fig. 137 INTAKE MANIFOLD - LOWER
1 - INTAKE MANIFOLD - LOWER
2 - BOLT - GASKET END SEAL RETAINER
3 - GASKET
4 - BOLT - LOWER INTAKE MANIFOLD
Fig. 138 Intake Manifold Gasket Sealing
1 - SEALER LOCATIONS
RSENGINE 3.3/3.8L9 - 149
INTAKE MANIFOLD - LOWER (Continued)
Page 2774 of 4284

EXHAUST MANIFOLD
DESCRIPTION
The exhaust manifolds are log type and made of
Hi-Sil-Moly (high temperature resistant) nodular cast
iron. The exhaust manifolds are attached directly to
the cylinder heads and a cross-over pipe connects the
two manifolds.
OPERATION
The exhaust manifolds collects the exhaust gases
exiting the combustion chambers. It then channels
the exhaust gases to the exhaust pipe that is
attached to the rear (right side) manifold.
EXHAUST MANIFOLD - RIGHT
REMOVAL
(1) Disconnect battery negative cable.
(2) Remove the wiper module. (Refer to 8 - ELEC-
TRICAL/WIPERS/WASHERS/WIPER MODULE -
REMOVAL)
(3) Disconnect spark plug wires.
(4) Remove bolts fastening crossover pipe to
exhaust manifold (Fig. 141).
(5) Disconnect and remove the upstream oxygen
sensor (Fig. 144).
(6) Remove the heat shield attaching screws (Fig.
144).
(7) Remove the upper heat shield (Fig. 144).
(8) Raise vehicle on hoist and remove drive belt
shield.
Fig. 139 INTAKE MANIFOLD - LOWER
1 - INTAKE MANIFOLD - LOWER
2 - BOLT - GASKET END SEAL RETAINER
3 - GASKET
4 - BOLT - LOWER INTAKE MANIFOLD
Fig. 140 LOWER MANIFOLD TIGHTENING
SEQUENCE
Fig. 141 CROSS-OVER PIPE
1 - CROSS-OVER PIPE
2 - BOLT
3 - GASKET
4 - FLAG NUT
9 - 150 ENGINE 3.3/3.8LRS
INTAKE MANIFOLD - LOWER (Continued)
Page 2775 of 4284

(9) Loosen the power steering pump support strut
lower bolt (Fig. 142).
(10) Disconnect downstream oxygen sensor connec-
tor.
(11) Disconnect catalytic converter pipe from
exhaust manifold (Fig. 143).
(12) Lower vehicle and remove the power steering
pump support strut upper bolt (Fig. 142).(13) Remove bolts attaching exhaust manifold to
cylinder head and remove manifold (Fig. 144).
(14) Inspect and clean manifold. (Refer to 9 -
ENGINE/MANIFOLDS/EXHAUST MANIFOLD -
CLEANING) (Refer to 9 - ENGINE/MANIFOLDS/
EXHAUST MANIFOLD - INSPECTION)
CLEANING
(1) Discard gasket (if equipped) and clean all sur-
faces of manifold and cylinder head.
INSPECTION
Inspect exhaust manifolds for damage or cracks
and check distortion of the cylinder head mounting
surface and exhaust crossover mounting surface with
a straightedge and thickness gauge (Fig. 145).
Manifold surface flatness limits should not exceed
1.0 mm (0.039 in.).
INSTALLATION
(1) Position exhaust manifold on cylinder head and
install bolts to center runner (cylinder #3) and initial
tighten to 2.8 N´m (25 in. lbs.) (Fig. 144)
(2) Using a new gasket, attach crossover pipe to
exhaust manifold and tighten bolts to 41 N´m (30 ft.
lbs.) (Fig. 141).
NOTE: Inspect crossover pipe fasteners for damage
from heat and corrosion. The cross-over bolts are
made of a special stainless steel alloy. If replace-
ment is required, OEM bolts are highly recom-
mended.
Fig. 142 P/S PUMP STRUT
1 - BOLT - LOWER
2 - STRUT - P/S PUMP
3 - BOLT - UPPER
Fig. 143 Catalytic Converter to Exhaust Manifold
1 - FLAG NUT
2 - GASKET
3 - BOLT
4 - CATALYTIC CONVERTER
Fig. 144 EXHAUST MANIFOLD - RIGHT
1 - SCREW - HEAT SHIELD
2 - HEAT SHIELD - UPPER
3 - BOLT - EXHAUST MANIFOLD
4 - HEAT SHIELD - LOWER
5 - EXHAUST MANIFOLD - RIGHT
6 - OXYGEN SENSOR - UPSTREAM
RSENGINE 3.3/3.8L9 - 151
EXHAUST MANIFOLD - RIGHT (Continued)
Page 2776 of 4284

(3) Install the remaining manifold attaching bolts.
Tighten all bolts to 23 N´m (200 in. lbs.).
(4) Position the power steering pump support strut
and install upper bolt (Fig. 142).
(5) Install heat shield and attaching screws (Fig.
144).
(6) Install and connect upstream oxygen sensor
(Fig. 144).
(7) Raise the vehicle.
(8) Attach catalytic converter pipe to exhaust man-
ifold using new gasket and tighten bolts to 37 N´m
(27 ft. lbs.) (Fig. 143).
(9) Connect downstream oxygen sensor connector.
(10) Tighten the power steering pump support
strut lower bolt (Fig. 142).
(11) Install the belt splash shield and lower the
vehicle.
(12) Install the wiper module. (Refer to 8 - ELEC-
TRICAL/WIPERS/WASHERS/WIPER MODULE -
INSTALLATION)
(13) Connect battery negative cable.
EXHAUST MANIFOLD - LEFT
REMOVAL
(1) Disconnect battery negative cable.
(2) Remove bolts attaching crossover pipe to
exhaust manifold (Fig. 146).
(3) Disconnect left cylinder bank spark plug wires.
(4) Remove heat shield attaching bolts (Fig. 147).
(5) Remove bolts attaching exhaust manifold to
cylinder head (Fig. 147).
(6) Remove the exhaust manifold (Fig. 147).(7) Inspect and clean manifold. (Refer to 9 -
ENGINE/MANIFOLDS/EXHAUST MANIFOLD -
INSPECTION) (Refer to 9 - ENGINE/MANIFOLDS/
EXHAUST MANIFOLD - CLEANING)
CLEANING
(1) Discard gasket (if equipped) and clean all sur-
faces of manifold and cylinder head.
Fig. 145 Check Exhaust Manifold Mounting
1 - STRAIGHT EDGE
2 - CROSSOVER PIPE MOUNTING SURFACE
3 - FEELER GAUGE
Fig. 146 CROSS-OVER PIPE
1 - CROSS-OVER PIPE
2 - BOLT
3 - GASKET
4 - FLAG NUT
Fig. 147 EXHAUST MANIFOLD - LEFT
1 - EXHAUST MANIFOLD - LEFT BANK
2 - HEAT SHIELD
3 - NUT - HEAT SHIELD
4 - BOLT - EXHAUST MANIFOLD
9 - 152 ENGINE 3.3/3.8LRS
EXHAUST MANIFOLD - RIGHT (Continued)