Mitsubishi Montero (1991+). Manual — part 173
FUEL SYSTEM PRESSURE RELEASE
WARNING: ALWAYS relieve fuel pressure before disconnecting any fuel
injection-related component. DO NOT allow fuel to contact
engine or electrical components.
1) On Colt and Mirage, remove rear seat cushion. On all
models, disconnect fuel pump harness connector at fuel tank.
2) Start engine. Let engine run until it stops. Turn ignition
off. Disconnect negative battery terminal. Connect fuel pump harness
connector.
FUEL PUMP
Removal & Installation
1) Fuel pump assembly is located inside fuel tank. Release
fuel pressure from system. See FUEL SYSTEM PRESSURE RELEASE. Raise
vehicle on hoist. Drain fuel into suitable container. Disconnect
electrical connectors and fuel hoses at fuel tank.
2) Remove fuel filler hose from fuel tank. Remove nuts
securing fuel tank. Remove fuel tank from vehicle and remove fuel pump
assembly. To install, reverse removal procedure. Tighten nuts to
specification. See TORQUE SPECIFICATION table.
FUEL RAILS & INJECTORS (PFI)
Use a rag to cover fuel hose connection before disconnecting
high pressure fuel hose at fuel rail. Some residual fuel pressure may
still be in system.
Removal (Except Pickup & Ram-50 2.4L)
1) On all models, relieve fuel pressure. See
FUEL SYSTEM PRESSURE RELEASE. Disconnect negative battery cable. On
Montero, Pickup, Ram-50, Stealth and 3000GT 3.0L, disconnect air
intake plenum. On Eclipse, disconnect PCV valve hose.
2) On Colt Vista, disconnect coolant temperature sensor
connector, idle speed control servo connector and brake booster vacuum
hose. On all models, disconnect high pressure fuel hose at fuel rail.
3) Disconnect fuel return hose. Disconnect vacuum hoses. On
Eclipse, Colt and Colt 200, disconnect throttle cable clamp. Remove
center cover. On all models, disconnect injector electrical
connectors. Remove fuel rail bolts and lift fuel rail and injectors
from engine.
Installation
To install, reverse removal procedure. Tighten bolts to
specifications. See TORQUE SPECIFICATIONS table.
Removal (Pickup & Ram-50 2.4L)
1) Relieve fuel pressure. See FUEL SYSTEM PRESSURE RELEASE.
Disconnect negative battery cable. Drain coolant. On all models,
disconnect air intake hose. Disconnect breather hose (if applicable)
and vacuum hoses.
2) Disconnect coolant lines as necessary for clearance.
Disconnect injector electrical connectors. Position all lines, hoses
and electrical connectors out of way. Disconnect throttle and/or
kickdown cables. Remove throttle body assembly and position it out of
the way.
3) Disconnect high pressure fuel hose at fuel rail.
Disconnect fuel return line and vacuum line connection at fuel rail.
Remove fuel rail bolts and lift fuel rail and injectors from engine.
Installation
1) To install, reverse removal procedure. Injectors may be
removed after fuel rail is removed from intake manifold. Use new
insulators and "O" rings when installing injectors.
2) Use spindle oil or gasoline on "O" ring. Install injectors
into fuel rail with a twisting motion. Adjust throttle and kickdown
cable (if applicable). Do not drop injectors while removing or
installing fuel rail.
OXYGEN (O2) SENSOR
Removal & Installation
1) O2 Sensor is mounted in exhaust pipe below exhaust header.
It is equipped with a permanent pigtail which must be protected from
damage when sensor is removed. Ensure sensor is free of contaminants,
avoid using cleaning solvents of any type. Sensor may be difficult to
remove when engine temperature is less than 120 F (48 C).
2) Always use anti-seize compound on threads before
installation. On non-turbo models, remove sensor using Remover
(MD998703). On turbo models, use Remover (MD998748) on Eclipse and
Galant, or Remover (MD998770) on Stealth and 3000GT. Tighten oxygen
sensor to specification. See TORQUE SPECIFICATIONS table.
THROTTLE BODY
Removal
Disconnect air intake hose. Remove accelerator and automatic
speed control cables (if equipped). Disconnect fuel vapor hose,
electrical harness connector, vacuum hose and coolant hoses. Remove
throttle body retaining bolts.
Disassembly
Remove throttle position sensor. Remove idle speed control
motor. Remove throttle bracket and connector bracket (if equipped).
Remove idle position switch and adjusting nut.
NOTE: DO NOT remove throttle valve. DO NOT use cleaning solvents
on throttle position sensor, idle speed control motor or
idle position switch.
Cleaning
Clean all parts except those noted in solvent. Check vacuum
port and passage for clogging. Clean vacuum, vapor and fuel passages
with compressed air.
Reassembly
To reassemble, reverse disassembly procedure.
Installation
To install, reverse removal procedure.
THROTTLE POSITION SENSOR/SWITCH
Removal & Installation
Throttle position sensor/switch is located on throttle body.
Disconnect TPS electrical connector. Remove bolts holding TPS and
remove TPS. To install, reverse removal procedure. Tighten throttle
position sensor/switch to specification. See TORQUE SPECIFICATIONS
table. For adjustment procedure, see ON-VEHICLE ADJUSTMENTS article.
TURBOCHARGERS
NOTE: Removal of turbocharger exhaust housing and water pipes at
turbocharger is not necessary when removing turbocharger
assembly. Stealth and 3000GT models have 2 (front and rear)
turbochargers.
Removal (Eclipse & Galant)
1) Disconnect negative battery cable. Drain engine coolant
and oil. On models with A/C, remove condenser fan motor assembly. On
all models, remove oxygen sensor. Remove oil dipstick guide and "O"
ring. See Figs. 8 and 9.
Fig. 8: Removing Turbocharger (Eclipse & Galant 2.0L)
Courtesy of Mitsubishi Motor Sales of America.
Fig. 9: Exploded View of Turbocharger Assembly (Eclipse & Galant
2.0L Shown; Stealth & 3000GT Similar)
Courtesy of Mitsubishi Motor Sales of America.
2) Disconnect air intake hose and vacuum hoses. Remove air
hose and air outlet housing. Remove heat protectors. Disconnect
exhaust pipe. Remove power steering oil pump and bracket. Remove
engine hanger bracket. Disconnect oil inlet pipe.
3) Disconnect coolant hose and tubes. Remove nuts and bolts
securing exhaust manifold. Remove exhaust manifold and gaskets.
Disconnect oil return pipe. Remove turbocharger assembly.
Removal (Stealth & 3000GT Front)
1) Disconnect negative battery cable. Drain engine oil and
coolant. Remove radiator. Disconnect exhaust pipe. Remove air intake
hose, air hoses and air pipe. Remove alternator and belt. Remove oil
dipstick guide.
2) Remove heat protector. Disconnect oxygen sensor electrical
connector. Remove oil return pipe. Remove turbocharger support bracket
and remove turbocharger from exhaust manifold. See Fig. 10.
Fig. 10: Removing Front Turbocharger (Stealth & 3000GT)
Courtesy of Mitsubishi Motor Sales of America.
Removal (Stealth & 3000GT Rear)
1) Disconnect battery cables and remove battery. Drain engine
oil and coolant. Remove accelerator cable. Remove air hose, air pipe
and heat protectors. Disconnect clutch booster vacuum hose. Remove air
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