1998 MITSUBISHI MONTERO air filter

90,000 MILE (144,000 KM) NORMAL SERVICE
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VERIFY 
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Last Major Service Was Performed 
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SERVICE 
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 Ball Joints With Grease Nipple (
6) 
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 Propeller Shaft Joints (
6) 
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INSPECT 
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 Fuel Hoses (
3) 
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 Drive Belt (For Generator, Water Pump, Power Steering Pump) 
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 Manual Transmission Oil 
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 Transfer Oil 
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 Disc Brake Pads (
4) 
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 Brake Hoses (
4) 
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 Ball Joint & Steering Linkage Seals (
3) 
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 Drive Shaft Boots (
4) 
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 Exhaust System (
3) 
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REPLACE 
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 Engine Oil (
1) 
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 Engine Oil Filter (
2) 
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 Engine Coolant 
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 Automatic Transmission Fluid 
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 Rear Axle Oil 
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 Air Cleaner Filter 
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(
1) - Change once a year or every 7,500 miles (12,000 KM). 

(
2) - If mileage is less than 7,500 miles (12,000 KM) each year, 

replace the oil filter at every oil change. 

(
3) - Or inspect every 2 years. 

(
4) - Or inspect every year. 

(
5) - Or change every 2 years. 

(
6) - Or lubricate grease every 2 years. 
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LUBRICATION SPECIFICATIONS 
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Material  Condition  Specification 
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Engine Oil  Ambient Temperature Less Than SAE 5W-30 

(
1)  0F (-18C) To 100F (38C)  

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Ambient Temperature Above 0F  SAE 10W-30 

 (-18C) To Over 100F (38C)  

  Engine Coolant 
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 Automatic Transmission Fluid 
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 Rear Axle Oil 
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 Spark Plugs 
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 Timing Belt (
9) 
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 Ignition Cables (
8) 
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 Air Cleaner Filter 
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(
1) - Change once a year or every 7,500 miles (12,000 KM). 

(
2) - If mileage is less than 7,500 miles (12,000 KM) each year, 

replace the oil filter at every oil change. 

(
3) - Or inspect every 2 years. 

(
4) - Or inspect every year. 

(
5) - Or change every 2 years. 

(
6) - Or lubricate grease every 2 years. 

(
7) - Or inspect every 5 years. 

(
8) - Or replace every 5 years. 

(
9) - For California & Massachusettes, this maintenance is 

recommended but not required. 
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LUBRICATION SPECIFICATIONS 
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Material  Condition  Specification 
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Engine Oil  Ambient Temperature Less Than SAE 5W-30 

(
1)  0F (-18C) To 100F (38C)  

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Ambient Temperature Above 0F  SAE 10W-30 

 (-18C) To Over 100F (38C)  
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Engine  All  50/50 Mixture Of 

Coolant   Distilled Water & 

  Ethylene Glycol 
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Manual  All API Classification GL-4

Transmission   SAE 75W-85W Or 75W-90 
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Automatic  All  "ATF DEXRON II" Or 

Transmission   Equivalent 
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Brake Fluid  All  DOT 3 Or DOT 4 
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Rear Axle  All API Classification GL-5

  Or Higher (
2) 
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Transfer Case All API Classification GL-4

  SAE 75W-85W Or 75W-90 
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(
1) - SAE 5W-30 engine oil is preferred. SAE 10W-30 may be used if 

the Ambient Temperature is above 0 F (-18 C). 

(
2) - SAE90, 85W-90, 80W-90 may be used in temperatures above 

-10 F (-23 C). SAE 80W, 80W-90 may be used in temperatures 

from -30 F (-34 C) to -10 F (-23 C). SAE 75W may be used 

in temperatures below -30 F (-34 C). 
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FLUID CAPACITIES 
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Incorrect ignition timing Reset ignition timing,
See TUNE-UP
Leaking valves Replace valves, See
ENGINES
Worn fuel pump diaphragm Replace diaphragm or
or piston piston









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Intake Backfire Improper ignition timing Reset ignition timing,
See TUNE-UP
Faulty accelerator pump Replace accelerator
discharge pump
Improper choke operation Check choke and adjust
as required
Defective EGR valve Replace EGR valve
Fuel mixture too lean Reset air/fuel mixture,
See TUNE-UP
Choke valve initial Reset choke valve
clearance too large initial clearance









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Exhaust Backfire Vacuum leak Inspect and repair
vacuum system
Faulty vacuum diverter Replace vacuum diverter
valve valve
Faulty choke operation Check choke and adjust
as required
Exhaust system leak repair exhaust system
leak









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Engine Ignition timing too far Reset ignition timing,
Detonation advanced See TUNE-UP
Faulty ignition system Check ignition timing,
See TUNE-UP
Spark plugs loose or Retighten or replace
faulty plugs
Fuel delivery system Inspect lines, pump and
clogged filter for clog
EGR valve inoperative Replace EGR valve
PCV system inoperative Inspect and/or replace
hoses or valve
Vacuum leaks Check vacuum system and
repair leaks
Excessive combustion
chamber deposits Remove built-up
deposits
Leaking, sticking or Inspect and/or replace
broken valves valves









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External Oil Fuel pump improperly seated Remove pump, replace
Leakage or worn gasket gasket and seat
properly
Oil pan gasket broken or Straighten pan and
pan bent replace gasket
Timing chain cover gasket Replace timing chain
broken cover gasket
Rear main oil seal worn Replace rear main oil
seal
Oil pan drain plug not Remove and reinstall
seated properly drain plug
Camshaft bearing drain Remove restriction
hole blocked
Oil pressure sending Remove and reinstall
switch leaking sending switch









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CONDITION POSSIBLE CAUSE CORRECTION








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Hesitation With Vacuum leak Inspect vacuum lines
Small Amount of
Gas Pedal Movement
Accelerator pump weak or Replace pump, see
inoperable FUEL SYSTEMS
Float level setting too low Reset float level,
see,FUEL SYSTEMS
Metering rods sticking or Inspect and/or
binding replace rods, see
FUEL SYSTEMS
Carburetor idle or transfer Inspect system and
system plugged remove restriction
Frozen or binding heated air Inspect heated air
inlet door for binding









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Hesitation With Defective accelerator pump Replace pump, see
Heavy Gas Pedal FUEL SYSTEMS
Movement
Metering rod carrier Remove restriction
sticking or binding
Large vacuum leak Inspect vacuum
system and repair
leak
Float level setting too Reset float level,
low see FUEL SYSTEMS
Defective fuel pump, lines Inspect pump, lines
or filter and filter
Air door setting incorrect Adjust air door
setting, see FUEL









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DIESEL ENGINE TROUBLE SHOOTING
NOTE: This is GENERAL information. This article is not intended
to be specific to any unique situation or individual vehicle
configuration. The purpose of this Trouble Shooting
information is to provide a list of common causes to
problem symptoms. For model-specific Trouble Shooting,
refer to SUBJECT, DIAGNOSTIC, or TESTING articles available
in the section(s) you are accessing.
NOTE: Diesel engines mechanical diagnosis is the same as gasoline
engines for items such as noisy valves, bearings, pistons,
etc. The following trouble shooting covers only items
pertaining to diesel engines.
BASIC DIESEL ENGINE TROUBLE SHOOTING CHART









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CONDITION POSSIBLE CAUSE CORRECTION








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Engine Won't Bad battery connections Check connections
Crank or dead batteries and/or replace

Air in fuel system Bleed air from system
Incorrect or contaminated Replace fuel
fuel
Injector nozzle malfunction Check nozzles, see
FUEL SYSTEMS









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Engines Starts Injection pump timing Reset pump timing, see
and Idles Rough incorrect FUEL SYSTEMS
W/out Smoke or Engine not fully broken in Put more miles on
Noise, But Clears engine
After Warm-Up Air in system Bleed air from system
Injector nozzle malfunction Check nozzles, see
FUEL SYSTEMS









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Engine Idles Blocked fuel filter Replace fuel filter
Correctly, Injection pump timing Reset pump timing, see
Misfires Above incorrect FUEL SYSTEMS
Idle Incorrect or contaminated Replace fuel
fuel









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Engine Won't Fast idle adjustment Reset fast idle, see
Return To Idle incorrect TUNE-UP
Internal injection pump Replace injection pump,
malfunction see FUEL SYSTEMS
External linkage binding Check linkage and
remove binding









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Fuel Leaks On Loose or broken fuel line Check lines and
Ground connections
Internal injection pump Replace injection pump,
seal leak see FUEL SYSTEMS









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Cylinder Injector nozzles sticking Test injectors, see
Knocking Noise open FUEL SYSTEMS
Very low nozzle opening Test injectors and/or
pressure replace









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Loss of Engine Restricted air intake Remove restriction
Power EGR valve malfunction Replace EGR valve
Blocked or damaged exhaust Remove restriction
system and/or replace
components
Blocked fuel tank filter Replace filter
Restricted fuel filter Remove restriction
and/or replace filter
Block vent in gas cap Remove restriction
and/or replace cap
Tank-to-injection pump fuel Check fuel lines and
supply blocked connections
Blocked fuel return system Remove restriction
Incorrect or contaminated Replace fuel
fuel
Blocked injector nozzles Check nozzle for
blockage, see FUEL
SYSTEMS
Low compression Check valves, rings,
pistons, see ENGINES









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Loud Engine Basic timing incorrect Reset timing, see
Noise With Black FUEL SYSTEMS
Smoke EGR valve malfunction Replace EGR valve
Internal injection pump Replace injection pump,
malfunction see FUEL SYSTEMS

Low fuel pressure Test pressure regul-
ator and fuel pump,
check for restricted
lines and filters
No distributor reference Repair ignition
pulses system as necessary
Open coolant temperature Test sensor and
sensor circuit wiring
Shorted W.O.T. switch in Disconnect W.O.T.
T.P.S. switch, engine
should start
Defective ECM Replace ECM
Fuel tank residual pressure Test for fuel
valve leaks pressure drop after
shut down









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Hard Starting Disconnected hot air tube Reconnect tube and
to air cleaner test control valve
Defective Idle Air Control Test valve operation
(IAC) valve and circuit
Shorted, open or misadjusted Test and adjust or
T.P.S. replace T.P.S.
EGR valve open Test EGR valve and
control circuit
Poor Oxygen sensor signal Test for shorted or
circuit
Incorrect mixture from PCV Test PCV for flow,
system check sealing of oil
filter cap









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Poor High Speed Low fuel pump volume Faulty pump or
Operation restricted fuel
lines or filters
Poor MAP sensor signal Test MAP sensor,
vacuum hose and
wiring
Poor Oxygen sensor signal Test for shorted or
open sensor or
circuit
Open coolant temperature Test sensor and
sensor circuit wiring
Faulty ignition operation Check wires for
cracks or poor con-
nections, test
secondary voltage
with oscilloscope
Contaminated fuel Test fuel for water

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High Pitched Whine Distance too great Align starter or check
During Cranking between starter that correct starter
Before Engine pinion and flywheel and flywheel are being
Fires but Engine used
Fires and Cranks
Normally









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High Pitched Distance too small between
Whine After Engine starter pinion and flywheel
Fires With Key Flywheel runout contributes
released. Engine to the intermittent nature
Fires and Cranks
Normally









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TUNE-UP TROUBLE SHOOTING - GAS ENGINE VEHICLES
NOTE: This is GENERAL information. This article is not intended
to be specific to any unique situation or individual vehicle
configuration. The purpose of this Trouble Shooting
information is to provide a list of common causes to
problem symptoms. For model-specific Trouble Shooting,
refer to SUBJECT, DIAGNOSTIC, or TESTING articles available
in the section(s) you are accessing.
BASIC SPARK PLUG TROUBLE SHOOTING CHARTS









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CONDITION POSSIBLE CAUSE CORRECTION








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Normal Spark Light Tan or Gray deposits No Action
Plug Condition
Electrode not burned or No Action
fouled
Gap tolerance not changed No Action









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Cold Fouling or Overrich air/fuel mixture Adjust air/fuel
Carbon Deposits mixture, see ENGINE
PERFORMANCE section
Faulty choke Replace choke
assembly, see ENGINE
PERFORMANCE section
Clogged air filter Clean and/or replace
air filter
Incorrect idle speed or Reset idle speed and/
dirty carburetor or clean carburetor
Faulty ignition wires Replace ignition
wiring
Prolonged operation Shut engine off
at idle during long idle
Sticking valves or worn Check valve train
valve guide seals









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Wet Fouling Worn rings and pistons Install new rings and
or Oil Deposits pistons

Engine cold and choke too Adjust choke and
lean allow engine to warm-
up
Defective spark plugs Replace spark plugs
Defective coil Replace coil









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Faulty Low Speed Clogged idle transfer slots Clean idle transfer
Operation slots, see FUEL
Restricted idle air bleeds Disassemble and clean
and passages carburetor, see FUEL
Clogged air cleaner Replace air filter
Defective spark plugs Replace spark plugs
Defective ignition wires Replace ignition wire
see ENGINE PERFORMANCE
Defective distributor cap Replace distributor
cap









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Faulty High Speed Incorrect ignition timing Reset ignition timing
Operation see ENGINE PERFORMANCE
Defective distributor Replace advance
centrifugal advance mechanism
Defective distributor Replace advance unit
vacuum advance
Incorrect spark plugs or Check gap and/or
plug gap replace spark plugs
Faulty choke operation Check choke and
repair as required
Clogged vacuum passages Remove restrictions
Improper size or clogged Check jet size and
main jet clean, see FUEL
Restricted air cleaner Check filter and
replace as necessary
Defective distributor cap, Replace cap, rotor or
rotor or coil coil









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Misfire at All Defective spark plugs Replace spark plugs
Speeds
Defective spark plug wires Replace spark plug
wires
Defective distributor cap, Replace cap, rotor,
rotor, or coil or coil
Cracked or broken vacuum Replace vacuum hoses
hoses