1998 MITSUBISHI MONTERO 3.0L engine

Application Curb Idle Basic Idle
1.5L & 1.8L ............ 600-800 ............... 650-750
2.0L
Non-Turbo ............ 700-900 ................... (1)
Turbo ................ 650-850 ............... 700-800
2.4L ................... 650-850 ............... 700-800
3.0L & 3.5L ............ 600-800 ............... 650-750
( 1) - Information is not available from manufacturer at time
of publication.









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NOTE: Basic idle speed should only be adjusted after verifying
spark plugs, fuel injectors, idle air control motor and
engine compression are okay.
All Other Models
1) Ensure vehicle is at normal operating temperature with all
lights, cooling fan and accessories off. Shift transmission into
Neutral or Park position.
2) Basic idle speed can only be adjusted using a scan tool to
ground Data Link Connector (DLC). Connect scan tool to DLC. DLC is
located below dash, near steering column. See Fig. 2.
3) Start engine and allow it to idle. Using scan tool, select
MFI SYSTEM ACTUATOR TEST, then select item 30. Check basic idle speed.
See IDLE SPEED SPECIFICATIONS table.
CAUTION: MFI system actuator test must be cancelled or test will
continue to run for 27 minutes. Driving vehicle under this
condition may damage engine.
4) Cancel MFI system actuator test. If idle speed is not
within specification, turn engine speed adjusting screw until correct
engine speed is obtained. See Fig. 6. Access to speed adjusting screw
is obtained by removing rubber plug on throttle body.
5) If idle speed cannot be lowered by turning engine speed
adjusting screw, determine if fixed Speed Adjusting Screw (SAS). Fixed\
SAS is stop screw contacting throttle lever. See
FIXED SPEED ADJUSTING SCREW for procedure.
6) After all adjustments are verified to be correct, possible
cause of incorrect idle speed is deterioration of Idle Air Control
(IAC) circuit. See DTC P0505 in G - TESTS W/CODES article.
CURB (SLOW) IDLE SPEED
NOTE: Curb idle speed is controlled by Idle Air Control (IAC)
motor. Adjustment is usually not necessary. For curb idle
speed specifications, see IDLE SPEED SPECIFICATIONS table
under BASIC IDLE SPEED.
1) Check ignition timing and adjust if necessary. See
IGNITION TIMING . Run engine at 2000-3000 RPM for more than 5 seconds.
Allow engine to idle for 2 minutes. Check curb idle speed.
2) If curb idle speed is not within specification, check IAC
system. See DTC P0505 in G - TESTS W/CODES article. If IAC system is
okay, adjust basic idle speed. See BASIC IDLE SPEED.
FIXED SPEED ADJUSTING SCREW
NOTE: Fixed Speed Adjusting Screw (SAS) is preset by manufacturer
and usually does not require adjustment. Only adjust fixed
SAS if other adjustment procedures require it, or if

2.0L
(VIN F) ........................................ 8.5:1
(VIN Y) ........................................ 9.6:1
2.4L (VIN G) ..................................... 9.5:1
3.0L
(VIN H) ........................................ 8.9:1
(VIN J) ....................................... 10.0:1
(VIN K) ........................................ 8.0:1
(VIN P) ........................................ 9.0:1
3.5L (VIN M & P) ................................. 9.0:1
Compression Pressure
1.5L (VIN A) ..................... 192 psi (13.4 kg/cm
)
1.8L (VIN C) ..................... 199 psi (13.9 kg/cm)
2.0L (VIN F) ..................... 178 psi (12.5 kg/cm)
2.0L (VIN Y) ............ 170-225 psi (11.7-15.5 kg/cm)
2.4L (VIN G) ..................... 192 psi (13.4 kg/cm)
3.0L
(VIN H & P) .................... 171 psi (12.0 kg/cm
)
(VIN J) ........................ 185 psi (13.0 kg/cm)
(VIN K) ........................ 156 psi (10.9 kg/cm)
3.5L (VIN M & P) ................. 171 psi (12.0 kg/cm)
Maximum Variation
Between Cylinders ( 2) ............... 14 psi (1.0 kg/cm
)
( 1) - See A - ENGINE/VIN ID article for VIN information.
( 2) - On Eclipse 2.0L non-turbo engine, maximum variation
between cylinders is 25%.









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Exhaust System Backpressure
The exhaust system can be tested with a vacuum or pressure
gauge. If using a pressure gauge, remove HO2S or air injection check
valve (if equipped). Connect a 0-5 psi pressure gauge and run engine
at 2500 RPM. If exhaust system backpressure is greater than 2 psi,
exhaust system or catalytic converter is plugged.
If using a vacuum gauge, connect vacuum gauge hose to intake
manifold vacuum port. Start engine. Observe vacuum gauge. Open
throttle part way and hold steady. If vacuum gauge indication slowly
drops after stabilizing, inspect exhaust system for restriction.
FUEL SYSTEM
* PLEASE READ THIS FIRST *
WARNING: ALWAYS relieve fuel pressure before disconnecting any fuel
injection-related component. DO NOT allow fuel to contact
engine or electrical components.
RELIEVING FUEL PRESSURE
1) On Diamante, disconnect fuel pump harness connector at
fuel tank from underneath vehicle. On Montero and Montero Sport,
remove cargo compartment carpet, remove access plate and disconnect
fuel pump harness connector. On all other models, remove rear seat
cushion, remove access plate (if required) and disconnect fuel pump
harness connector.
2) On all models, start engine. Let engine run until it
stops. Turn ignition off. Disconnect negative battery cable. Connect
fuel pump harness connector. Install rear seat and/or carpet as
necessary.
WARNING: Before disconnecting high pressure fuel hose at fuel

GENERATOR OUTPUT TEST
NOTE: A slightly discharged battery should be used, as a fully
charged battery may not allow full generator output.
1) Turn ignition off. Disconnect negative battery cable.
Disconnect generator output wire from terminal "B". Connect positive
lead of 100-amp ammeter to terminal "B" and negative lead to
disconnected output lead.
CAUTION: Tighten each connection securely, as heavy current flow will
exist. DO NOT use clips on ammeter. An inductive-type
ammeter is recommended.
2) Connect positive voltmeter lead (0-20 volts) to generator\
terminal "B" and negative lead to ground. Install a tachometer and
reconnect negative battery cable.
3) Ensure voltmeter indicates battery voltage. If voltage is
not present, check for open circuit in wire between generator terminal
"B" and positive battery terminal. Check grounds and fusible link.
4) Start engine and turn headlights on. Set headlights at
high beam and heater blower switch on HIGH. Increase engine speed to
2500 RPM and note generator output current on ammeter. Minimum output
should be within specification. See
GENERATOR MINIMUM OUTPUT SPECIFICATIONS table.
NOTE: Output voltage changes with electrical load and temperature.
Ensure proper electrical load is applied while checking
output. Nominal output may not be obtained if generator or
ambient temperature is excessive. Allow generator or
temperature to cool, and recheck output. Generator output is
stamped on metal plate attached to generator case.
5) If minimum output is not obtained and generator wiring is
okay, repair generator. Operate engine at idle speed after the test.
GENERATOR MINIMUM OUTPUT SPECIFICATIONS TABLE









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Application Amps
Diamante ............................................. 110
Eclipse
2.0L Non-Turbo ...................................... 90
2.0L Turbo .......................................... 75
2.4L ................................................ 90
Galant ................................................ 90
Mirage ................................................ 80
Montero .............................................. 100
Montero Sport
2.4L ................................................ 60
3.0L ................................................ 85
3000GT
DOHC ............................................... 110
SOHC ................................................ 90









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REGULATED VOLTAGE TEST
NOTE: Ensure battery is fully charged and proper drive belt
tension exists.
1) Turn ignition switch off. Disconnect negative battery
cable. Connect positive voltmeter lead to terminal "S" of generator.

voltage between ground and harness-side connector terminal No. 33
(White wire). See WIRING DIAGRAMS. Voltmeter should read 5 volts. If
voltage is as specified, replace tachometer. If voltage is not as
specified, go to step 4).
2) Check continuity between ground and instrument cluster
harness-side connector terminal No. 34 (Black wire). See
WIRING DIAGRAMS . If continuity is present, replace tachometer. If
continuity is not present, go to step 5).
3) Check voltage between ground and instrument cluster
harness-side connector terminal No. 42 (Black/White wire). See
WIRING DIAGRAMS . Battery voltage should be present. If battery voltage
is present, replace tachometer. If battery voltage is not present, go
to step 6).
4) Check harness connectors to ECM, instrument cluster or
distributor assembly (1.5L). Repair as necessary. If connectors are
okay, check circuit between ECM, instrument cluster and distributor
(1.5L). See WIRING DIAGRAMS . Repair as necessary.
5) Check joint connector to instrument cluster. Repair as
necessary. If connector is okay, check circuit between instrument
cluster and ground. See WIRING DIAGRAMS. Repair as necessary.
6) Check harness and joint connectors to power supply
junction block. Repair as necessary. If connectors are okay, check
circuit between instrument cluster and power supply. See
WIRING DIAGRAMS . Repair as necessary.
Circuit Test (Montero Sport)
1) Remove instrument cluster. See INSTRUMENT CLUSTER under
REMOVAL & INSTALLATION. Disconnect instrument cluster harness
connector. Connect voltmeter between ground and instrument cluster
harness-side connector terminal No. 14 (White wire). Start and idle
engine. Voltmeter should read about 5 volts. If voltage is as
specified, problem is intermittent. If voltage is not as specified, go
to next step.
2) Check instrument cluster harness connector. Repair as
necessary. If connector is okay, go to next step on 2.4L engines or
step 7) on 3.0L engines.
3) Check noise filter harness connector (located behind
instrument cluster). Repair as necessary. If connector is okay, go to
next step.
4) Check circuit between instrument cluster harness connector
and noise filter connector. See WIRING DIAGRAMS. Repair as necessary.
If circuit is okay, go to next step.
5) Remove noise filter (located near throttle position sensor\
harness). Check resistance between noise filter terminals. Resistance
should be 1760-2640 ohms. If resistance is not as specified, replace
noise filter. If resistance is as specified, go to next step.
6) Check joint connector behind right side of dash. Repair as
necessary. If connector is okay, check circuit between joint connector
and instrument cluster harness connector. See WIRING DIAGRAMS. Repair
as necessary. If circuit is okay, go to next step.
7) Check voltage between ground and instrument cluster
harness-side connector terminal No. 24 (Black/White wire). If battery
voltage is present, problem is intermittent. If battery voltage is not
present, go to next step.
8) Check harness connector to instrument cluster. Repair as
necessary. If connector is okay, check circuit between instrument
cluster and ignition switch. See WIRING DIAGRAMS. Repair as necessary.
If circuit is okay, go to next step.
9) Check circuit between ground and instrument cluster
harness-side connector terminal No. 13 (Black wire). If continuity is
present, problem is intermittent. If continuity is not present, check
harness connector to instrument cluster and to chassis ground. See
WIRING DIAGRAMS . Repair as necessary. If connectors are okay, replace

Fig. 10: Engine Performance-Related Components (Montero Sport 3.0L)
Courtesy of Mitsubishi Motor Sales of America

DISTRIBUTOR
NOTE: Eclipse, Mirage 1.8L, Montero, Montero Sport 3.0L and 3000GT
DOHC use Distributorless Ignition System (DIS). All other
models use distributor type ignition systems with
non-serviceable distributors on which only the rotor and
distributor cap can be changed.
FUEL SYSTEM
* PLEASE READ THIS FIRST *
WARNING: Always relieve fuel pressure before disconnecting any fuel
injection-related component. DO NOT allow fuel to contact
engine or electrical components.
FUEL SYSTEM PRESSURE RELEASE
Relieving Fuel Pressure
1) On Diamante, disconnect fuel pump harness connector at
fuel tank from underneath vehicle. On Montero and Montero Sport,
remove cargo compartment carpet, remove access plate and disconnect
fuel pump harness connector. On all other models, remove rear seat
cushion and remove access plate (if required) to disconnect fuel pump
harness connector.
2) On all models, start engine. Let engine run until it
stops. Turn ignition off. Disconnect negative battery cable. Connect
fuel pump harness connector. Reinstall rear seat (if necessary.)
FUEL PUMP
Removal & Installation (Diamante, Eclipse, Galant & Montero)
1) Fuel pump assembly is located inside fuel tank. Release
fuel pressure. See FUEL SYSTEM PRESSURE RELEASE . Remove access panel
under seat, in trunk or in rear cargo area. Disconnect electrical
connectors and fuel hoses at fuel tank.
2) Remove fuel filler hose from fuel tank. Remove fuel pump
assembly. To install, reverse removal procedure. Tighten nuts to
specification. See TORQUE SPECIFICATIONS .
Removal & Installation (Mirage, Montero Sport & 3000GT)
1) Fuel pump assembly is located inside fuel tank. Release
fuel pressure. See FUEL SYSTEM PRESSURE RELEASE . Raise vehicle on
hoist. Drain fuel into suitable container. Disconnect electrical
connectors and breather/fuel hoses at fuel tank.
2) Remove fuel filler hose from fuel tank. Support fuel tank
with transmission jack. Remove nuts securing fuel tank. Remove fuel
tank from vehicle. Remove fuel pump assembly. To install, reverse
removal procedure. Tighten nuts to specification. See
TORQUE SPECIFICATIONS .
FUEL RAILS & INJECTORS
WARNING: 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.
CAUTION: DO NOT drop injectors while removing or installing fuel rail.
Removal (Diamante, Montero Sport 2.4L & 3000GT)

1) Relieve fuel pressure. See FUEL SYSTEM PRESSURE RELEASE.
Disconnect negative battery cable. Drain coolant. Remove air intake
hose. Remove throttle body and gasket with control cables and vacuum
hoses attached.
2) Remove EGR pipe (if equipped). Disconnect power brake
hose. Label and disconnect vacuum hoses and wiring harness connectors
as necessary. Remove intake plenum brackets and mounting bolts. Remove
intake plenum and gasket.
3) Disconnect high pressure fuel hose at fuel rail.
Disconnect fuel return hose. Disconnect vacuum hoses. Disconnect
injector electrical connectors. Remove fuel rail bolts, and lift fuel
rail and injectors from engine. Injectors may be removed after fuel
rail is removed from intake manifold.
Installation
To install, reverse removal procedure. Use NEW insulators and
"O" rings when installing injectors. Install injectors into fuel rail
with a twisting motion. Ensure injectors rotate smoothly when
installing. Refill cooling system.
Removal (Eclipse, Galant, Mirage & Montero Sport 3.0L)
1) Relieve fuel pressure. See FUEL SYSTEM PRESSURE RELEASE.
Disconnect negative battery cable. Disconnect PCV hose and breather
hoses. Disconnect high pressure fuel hose at fuel rail. Disconnect
fuel return hose and vacuum hoses.
2) Disconnect injector electrical connectors. Remove fuel
rail bolts, and lift fuel rail and injectors from engine. Injectors
may be removed after fuel rail is removed from intake manifold.
Installation
To install, reverse removal procedure. Use NEW insulators and
"O" rings when installing injectors. Use lubricant on "O" rings.
Install injectors into fuel rail with a twisting motion. Ensure
injectors rotate smoothly when installing.
Removal (Montero)
1) Relieve fuel pressure. See FUEL SYSTEM PRESSURE RELEASE.
Disconnect negative battery cable. Remove air intake hose. Remove
accelerator cable adjusting bolts. On A/T models, remove throttle
control cable. On all models, remove accelerator cable. Label and
disconnect all vacuum hoses from throttle body and upper intake
manifold (air intake plenum).
2) Remove EGR pipe and gasket. Remove ignition coil (if
necessary). Remove engine oil filler neck bracket. Disconnect PCV
hose. Remove throttle body, leaving coolant hoses connected. Remove
throttle body gasket. Remove front and rear intake plenum brackets.
Remove intake plenum mounting bolts. Remove intake plenum and gasket.
3) Disconnect high pressure fuel hose at fuel rail.
Disconnect fuel return hose. Disconnect vacuum hoses. Disconnect
injector electrical connectors. Remove fuel rail bolts, and lift fuel
rail and injectors from engine. Injectors may be removed after fuel
rail is removed from intake manifold.
Installation
To install, reverse removal procedure. Use NEW insulators and
"O" rings when installing injectors. Use lubricant on "O" rings.
Install injectors into fuel rail using a twisting motion. Ensure
injectors rotate smoothly when installing. Adjust throttle control and
accelerator cables (if necessary). Refill cooling system.
HEATED OXYGEN SENSOR (HO2S)
Removal & Installation

3) Turn steering wheel lock-to-lock. Fluid level should not
change more than .2" (5 mm). If pump is noisy, fluid rises after
engine is turned off, or fluid level changes more than specified,
repeat bleeding procedure.
ADJUSTMENTS
BELT TENSION ADJUSTMENT SPECIFICATIONS
BELT ADJUSTMENT








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Application ( 1) Deflection: In. (mm)
Montero
New Belt ......................................... .42-.54 (11-14)\
Used Belt ........................................ .58-.66 (15-17)\
Montero Sport
2.4L
New Belt ......................................... .16-.24 (4-6)\
Used Belt ........................................ .24-.28 (6-7)\
3.0L
New Belt ....................................... .44-.52 (11-13)\
Used Belt ...................................... .56-.64 (14-16)\
( 1) - With 22 lbs. (10 kg) pressure applied midway on longest belt
run.









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STEERING WHEEL PLAY
Raise and support vehicle. Start engine and let idle. With
steering wheel in center position, ensure free play is 1.1" (27 mm) or\
less. If measured value exceeds specification, check steering gear
backlash and linkage ball joint end play. See STEERING GEAR BACKLASH
and LINKAGE BALL JOINT END PLAY.
STEERING GEAR BACKLASH
1) Set steering wheel in straight-ahead position. Raise and
support vehicle. Disconnect relay rod from pitman arm. Using a dial
indicator, measure steering gear backlash at top end of pitman arm.
2) Steering gear backlash should not exceed .02" (.5 mm). If\
measured value exceeds limit, turn steering gearbox adjusting bolt
until steering wheel free play is within specification. See Fig. 1.
Fig. 1: Measuring Steering Gear Backlash
Courtesy of Mitsubishi Motor Sales of America.
TESTING