spark plugs MITSUBISHI MONTERO 1998 User Guide

Idle Speed Control Actuator ............................... ISC
Mix Control Solenoid .............................. MC Solenoid
Secondary Air Injection System Management Device .... AIR, PAIR
Vacuum Regulator Solenoid .................................. ..
Waste Gate Control Solenoid ................................ ..









\









\









\









\









\









\









\


SHROUDS, BAFFLES AND DEFLECTORS
SHROUD, BAFFLE AND DEFLECTOR INSPECTION








\









\









\









\









\









\









\


Condition Code Procedure
Application incorrect,
affecting cooling system
performance ............ A . Require repair or replacement.
Attaching hardware
broken ................. A .. Require repair or replacement
of hardware.
Attaching hardware
missing ................ C ......... Require replacement of
hardware.
Attaching hardware not
functioning ............ A .. Require repair or replacement
of hardware.
Bent, affecting cooling
system performance ..... A . Require repair or replacement.
Blocked, affecting cooling
system performance ..... A . Require repair or replacement.
Broken, affecting cooling
system performance ..... A . Require repair or replacement.
Cracked, affecting cooling
system performance ..... A . Require repair or replacement.
Loose, affecting cooling
system performance ..... A ................ Require repair.
Loose, not affecting
cooling system
performance ............ 2 ................ Suggest repair.
Missing, affecting cooling
system performance ..... C ........... Require replacement.









\









\









\









\









\









\









\


SPARK PLUGS
NOTE: You are not required to replace spark plugs in sets.
However, you may suggest replacement of the other plugs
for preventive maintenance.
SPARK PLUG INSPECTION









\









\









\









\









\









\









\


Condition Code Procedure
Application incorrect ... B ............ Require replacement.
Electrode eroded ........ 1 ............ Suggest replacement.
Fouled .................. A ........... ( 1) Require repair or
replacement.
Gap incorrect ........... B .. Require repair or replacement.
Insulation broken ....... A ............. Require replacement
Insulator cracked ....... A ............ Require replacement.
Leaking compression ..... A .. Require repair or replacement.
Maintenance interval .... 3 ............ Suggest replacement.
Threads damaged ......... A .. Require repair or replacement.
Threads stripped (threads

F - BASIC TESTING
1998 Mitsubishi Montero
1998 ENGINE PERFORMANCE
Mitsubishi - Basic Diagnostic Procedures
Diamante, Eclipse, Galant, Mirage, Montero, Montero Sport,
3000GT
INTRODUCTION
The following diagnostic steps will help prevent overlooking
a simple problem. This is also where to begin diagnosis for a no-start
condition. The first step in diagnosing any driveability problem is
verifying the customer's complaint with a test drive under the
conditions the problem reportedly occurred.
Before entering self-diagnostics, perform a careful and
complete visual inspection. Most engine control problems result from
mechanical breakdowns, poor electrical connections or
damaged/misrouted vacuum hoses. Before condemning the computerized
system, perform each test listed in this article.
NOTE: Perform all voltage tests with a Digital Volt-Ohmmeter
(DVOM) with a minimum 10-megohm input impedance, unless
stated otherwise in test procedure.
PRELIMINARY INSPECTION & ADJUSTMENTS
VISUAL INSPECTION
Visually inspect all electrical wiring, looking for chafed,
stretched, cut or pinched wiring. Ensure electrical connectors fit
tightly and are not corroded. Ensure vacuum hoses are properly routed
and are not pinched or cut. See M - VACUUM DIAGRAMS article to verify
routing and connections (if necessary). Inspect air induction system
for possible vacuum leaks.
MECHANICAL INSPECTION
Compression
Check engine mechanical condition with a compression gauge,
vacuum gauge, or an engine analyzer. See engine analyzer manual for
specific instructions.
WARNING: DO NOT use ignition switch during compression tests on fuel
injected vehicles. Use a remote starter to crank engine.
Fuel injectors on many models are triggered by ignition
switch during cranking mode, which can create a fire hazard
or contaminate the engine's oiling system.
Check engine compression with engine at normal operating
temperature, all spark plugs removed and throttle wide open. See
COMPRESSION SPECIFICATIONS table.
COMPRESSION SPECIFICATIONS TABLE









\









\









\









\









\









\






Application (1) Specification
Compression Ratio
1.5L (VIN A) ..................................... 9.0:1
1.8L (VIN C) ..................................... 9.5:1

L - WIRING DIAGRAMS article.
1) Specific self-diagnostic test is not available from
manufacturer at time of publication. Check ignition coil, power
transistor, spark plugs, fuel injectors, heated oxygen sensor,
crankshaft position sensor, and related connectors and harnesses.
2) Also check compression pressure, timing belt, fuel
pressure, and for intake air leaks. See F - BASIC TESTING article.
DTC P0325: KNOCK SENSOR (KS) NO. 1 CIRCUIT FAILURE
NOTE: This test applies to 3000GT equipped with DOHC engine only.
For terminal identification, see TERMINAL IDENTIFICATION. For
circuit and wire color identification, see
L - WIRING DIAGRAMS article.
1) Component or scan tool testing procedure not available
from manufacturer at time of publication. Turn ignition switch to OFF
position. Disconnect KS connector and PCM connector. Ground PCM
connector terminal No. 91. Go to next step.
2) Using DVOM, check for continuity between chassis ground
and KS connector terminal No. 1. If continuity does not exist, repair
wiring harness as necessary. If continuity exists, go to next step.
3) Remove jumper wire from PCM connector terminal No. 1.
Check for continuity between chassis ground and KS connector terminal
No. 2. If continuity does not exist, repair wiring harness as
necessary. If continuity exists, go to next step.
4) Test is complete. Intermittent problem may exist. Road
test vehicle (if necessary) and attempt to duplicate conditions that
caused original complaint. Recheck for DTCs. If no DTCs are displayed,
go to INTERMITTENT DTCS .
DTC P0335: CRANKSHAFT POSITION (CKP) SENSOR CIRCUIT FAILURE
NOTE: For terminal identification, see TERMINAL IDENTIFICATION. For
circuit and wire color identification, see
L - WIRING DIAGRAMS article.
NOTE: Procedures are provided by manufacturer for component
testing using an engine analyzer with oscilloscope
capability. Refer to manufacturer's operation manual for
instructions in use of oscilloscope.
1) If using scan tool, go to step 3). Disconnect CKP sensor
connector. Install Test Harness (MB991348) between CKP sensor and
connector. Using engine analyzer with oscilloscope capability, connect
special patterns probe to CKP sensor connector terminal No. 2. Go to
next step.
2) Start engine. Compare oscilloscope wave pattern with
known-good wave pattern. See Fig. 38. Verify wavelength (time)
decreases as engine RPM increases. If wave pattern fluctuates to left
or right, check for loose timing belt or an abnormality in sensor
pick-up disc. If a rectangular wave pattern is generated even when
engine is not started, substitute known-good CKP sensor. Repeat test.
If wave pattern is still abnormal, go to step 6).
Fig. 38: Identifying Known-Good CKP Sensor Wave Pattern
Courtesy of Mitsubishi Motor Sales of America

\b\
\
\
 \
 \
\
\



Trailer Towing Or  Replace  Engine Oil  3,000 Mile (4800 KM) 

Police, Taxi Or    Or 3 Months 

Commercial Type \b
\
\
 \
\
\



Operation  Replace  Oil Filter  6,000 Mile (9600 KM) 

   Or 6 Months 

\b
\
\
 \
\
\



 Replace  Spark Plugs  15,000 Mile (24,000 KM) 

\b
\
\
 \
\
\



 Replace  Manual  30,000 Mile (48,000 KM) 

 Transmission  

  Oil  

\b
\
\
 \
\
\



 Replace Transfer Oil  30,000 Mile (48,000 KM) 
\b
\
\
\
 \
 \
\
\



Extensive Idling  Replace  Engine Oil  3,000 Mile (4800 KM) 

Driving in Stop &    Or 3 Months 

Stop & Go Traffic    

\b
\
\
 \
\
\



 Replace  Oil Filter  6,000 Mile (9600 KM) 

   Or 6 Months 
\b
\
\
\
 \
 \
\
\



Short-trip  Replace  Engine Oil  3,000 Mile (4800 KM) 

Operation at    Or 3 Months 

Freezing \b
\
\
 \
\
\



Temperatures  Replace  Oil Filter  6,000 Mile (9600 KM) 

(Engine not    Or 6 Months 

thoroughly warmed)\b
\
\
 \
\
\



 Replace  Spark Plugs  15,000 Mile (24,000 KM) 
\b
\
\
\
 \
 \
\
\



Driving In  Replace  Air Cleaner  15,000 Mile (24,000 KM) 

Sandy Areas   Filter  
\b
\
\
\
 \
 \
\
\



Driving In  Inspect  Disc Brake  6,000 Mile (9,600 KM) 

Salty Areas   Pads  Or 6 Months 
\b
\
\
\
 \
 \
\
\



More than 50 %  Replace  Engine Oil  3,000 Mile (4800 KM) 

Operation in Heavy   Or 3 Months 

City Traffic Or \b
\
\
 \
\
\



At Sustained High  Replace  Oil Filter  6,000 Mile (9600 KM) 

Speeds During Hot    Or 6 Months 

Weather Above \b
\
\
 \
\
\



90 F (32 C)  Replace  Manual  30,000 Mile (48,000 KM) 

 Transmission  

  Oil  

\b
\
\
 \
\
\



 Replace Transfer Oil  30,000 Mile (48,000 KM) 
\b
\
\
\
 \
 \
\
\



Driving On  Replace  Manual  30,000 Mile (48,000 KM) 

Off-Road  Transmission  

  Oil  

\b
\
\
 \
\
\



 Replace Transfer Oil  30,000 Mile (48,000 KM) 
\b
\
\
\
\
\
\
\





(
1) - Perform these services at the mileage or number of months 

(since the last time), WHICHEVER COMES FIRST. 
\f
\
\
\
\
\
\
\


7,500 MILE (12,000 KM) NORMAL SERVICE
7,500 MILE (12,000 KM) NORMAL SERVICE

\b \
\
\
\
\
\
\



 Drive Shaft Boots (
4) 
\b
 \
\
\
\
\
\
\



 Exhaust System (
3) 
\b
 \
\
\
\
\
\
\



 Distributor Cap & Rotor (
7) 
\b
\
\
\
\
\
\
\




REPLACE 
\b
\
\
\
\
\
\
\



 Engine Oil (
1) 
\b
 \
\
\
\
\
\
\



 Engine Oil Filter (
2) 
\b
 \
\
\
\
\
\
\



 Engine Coolant 
\b
 \
\
\
\
\
\
\



 Automatic Transmission Fluid 
\b
 \
\
\
\
\
\
\



 Rear Axle Oil 
\b
 \
\
\
\
\
\
\



 Spark Plugs 
\b
 \
\
\
\
\
\
\



 Timing Belt (
9) 
\b
 \
\
\
\
\
\
\



 Ignition Cables (
8) 
\b
 \
\
\
\
\
\
\



 Air Cleaner Filter 
\b
\
\
\
\
\
\
\



(
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. 
\b
\
\
\
\
\
\
\




LUBRICATION SPECIFICATIONS 
\b
\
\
\
\
\
\
\




Material  Condition  Specification 
\b
\
 \
\
\
 \
\
\



Engine Oil  Ambient Temperature Less Than SAE 5W-30 

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

\b
\
\
\
 \
\



Ambient Temperature Above 0F  SAE 10W-30 

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



Engine  All  50/50 Mixture Of 

Coolant   Distilled Water & 

  Ethylene Glycol 
\b
\
 \
\
\
 \
\
\



Manual  All API Classification GL-4

Transmission   SAE 75W-85W Or 75W-90 
\b
\
 \
\
\
 \
\
\



Automatic  All  "ATF DEXRON II" Or 

Transmission   Equivalent 
\b
\
 \
\
\
 \
\
\



Brake Fluid  All  DOT 3 Or DOT 4 
\b
\
 \
\
\
 \
\
\



Rear Axle  All API Classification GL-5

  Or Higher (
2) 

  Engine Coolant 
\b
 \
\
\
\
\
\
\



 Automatic Transmission Fluid 
\b
 \
\
\
\
\
\
\



 Rear Axle Oil 
\b
 \
\
\
\
\
\
\



 Spark Plugs 
\b
 \
\
\
\
\
\
\



 Timing Belt (
9) 
\b
 \
\
\
\
\
\
\



 Ignition Cables (
8) 
\b
 \
\
\
\
\
\
\



 Air Cleaner Filter 
\b
\
\
\
\
\
\
\



(
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. 
\b
\
\
\
\
\
\
\




LUBRICATION SPECIFICATIONS 
\b
\
\
\
\
\
\
\




Material  Condition  Specification 
\b
\
 \
\
\
 \
\
\



Engine Oil  Ambient Temperature Less Than SAE 5W-30 

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

\b
\
\
\
 \
\



Ambient Temperature Above 0F  SAE 10W-30 

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



Engine  All  50/50 Mixture Of 

Coolant   Distilled Water & 

  Ethylene Glycol 
\b
\
 \
\
\
 \
\
\



Manual  All API Classification GL-4

Transmission   SAE 75W-85W Or 75W-90 
\b
\
 \
\
\
 \
\
\



Automatic  All  "ATF DEXRON II" Or 

Transmission   Equivalent 
\b
\
 \
\
\
 \
\
\



Brake Fluid  All  DOT 3 Or DOT 4 
\b
\
 \
\
\
 \
\
\



Rear Axle  All API Classification GL-5

  Or Higher (
2) 
\b
\
 \
\
\
 \
\
\



Transfer Case All API Classification GL-4

  SAE 75W-85W Or 75W-90 
\b
\
\
\
\
\
\
\



(
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). 
\b
\
\
\
\
\
\
\




FLUID CAPACITIES 
\b
\
\
\
\
\
\
\


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









\









\









\









\









\









\









\







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









\









\









\









\









\









\









\







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









\









\









\









\









\









\









\







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









\









\









\









\









\









\









\







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









\









\









\









\









\









\









\

Excessive cylinder wear Rebore or replace
block
Excessive valve guide Worn or loose bearing
clearance









\









\









\









\









\









\









\







Gap Bridged Deposits in combustion Clean combustion
chamber becoming fused chamber of deposits
to electrode









\









\









\









\









\









\









\







Blistered Engine overheating Check cooling system
Electrode
Wrong type of fuel Replace with correct
fuel
Loose spark plugs Retighten spark plugs
Over-advanced ignition Reset ignition timing
timing see ENGINE PERFORMANCE









\









\









\









\









\









\









\







Pre-Ignition or Incorrect type of fuel Replace with correct
Melted Electrodes fuel
Incorrect ignition timing Reset ignition timing
see ENGINE PERFORMANCE
Burned valves Replace valves
Engine Overheating Check cooling system
Wrong type of spark plug, Replace with correct
too hot spark plug, see
ENGINE PERFORMANCE









\









\









\









\









\









\









\







Chipped Severe detonation Check for over-
Insulators advanced timing or
combustion
Improper gapping Re-gap spark plugs
procedure









\









\









\









\









\









\









\







Rust Colored Additives in unleaded Try different fuel
Deposits fuel brand









\









\









\









\









\









\









\







Water In Combus- Blown head gasket or Repair or replace
tion Chamber cracked head head or head gasket









\









\









\









\









\









\









\







NOTE: Before diagnosing an electronic ignition system, ensure that
all wiring is connected properly between distributor, wiring
connector and spark plugs. Ignition problem will show up
either as: Engine Will Not Start or Engine Runs Rough.
BASIC ELECTRONIC IGNITION TROUBLE SHOOTING CHARTS









\









\









\









\









\









\









\







CONDITION POSSIBLE CAUSE CORRECTION








\









\









\









\









\









\









\







Engine Won't Open circuit between Repair circuit
Start distributor and bulkhead
connector
Open circuit between Repair circuit
bulkhead connector and

ignition switch
Open circuit between Repair circuit
ignition switch and
starter solenoid









\









\









\









\









\









\









\







Engine Runs Fuel lines leaking or Tighten fitting,
Rough clogged remove restriction
Initial timing incorrect Reset ignition timing
see ENGINE PERFORMANCE
Centrifugal advance Repair distributor
malfunction advance
Defective spark plugs or Replace plugs or plug
wiring wiring









\









\









\









\









\









\









\







Component Failure Spark arc-over on cap, Replace cap, rotor or
rotor or coil or coil
Defective pick-up coil Replace pick-up coil
Defective ignition coil Replace ignition coil
Defective vacuum unit Replace vacuum unit
Defective control module Replace control module









\









\









\









\









\









\









\







BASIC ELECTRONIC IGNITION TROUBLE SHOOTING
CHARTS - USING OSCILLOSCOPE PATTERNS









\









\









\









\









\









\









\







CONDITION POSSIBLE CAUSE CORRECTION








\









\









\









\









\









\









\







Firing Voltage Retarded ignition timing Reset ignition
Lines are the Same, timing, see ENGINE
but Abnormally High PERFORMANCE section
Fuel mixture too lean Readjust carburetor,
see ENGINE PERFORMANCE
High resistance in coil Replace coil wire
wire
Corrosion in coil tower Clean and/or replace
terminal coil
Corrosion in distributor Clean and/or replace
coil terminal distributor cap









\









\









\









\









\









\









\







Firing Voltage Fuel mixture too rich Readjust carburetor,
Lines are the Same see ENGINE PERFORMANCE
but Abnormally Low
Breaks in coil wire causing Replace coil wire
arcing
Cracked coil tower causing Replace coil
arcing
Low coil output Replace coil
Low engine compression Determine cause and

repair








\









\









\









\









\









\









\







One or More, But Carburetor idle mixture Readjust carburetor,
Not All Firing not balanced see ENGINE PERFORMANCE
Voltage Lines are
Higher Than Others EGR valve stuck open Clean and/or replace
valve
High resistance in spark Replace spark plug
plug wires wires
Cracked or broken spark Replace spark plugs
plug insulator
Intake vacuum leak Repair leak
Defective spark plugs Replace spark plugs
Corroded spark plug Replace spark plugs
terminals









\









\









\









\









\









\









\







One or More, But Curb idle mixture not Readjust carburetor,
Not All Firing balanced see ENGINE PERFORMANCE
Voltage Lines Are
Lower Than Others Breaks in plug wires Replace plug wires
causing arcing
Cracked coil tower causing Replace coil
arcing
Low compression Determine cause and
repair
Defective spark plugs Replace spark plugs
Corroded spark plugs Replace spark plugs









\









\









\









\









\









\









\







Cylinders Not Cracked distributor cap Replace distributor
Firing terminals cap
Shorted spark plug wire Determine cause and
repair
Mechanical problem in Determine cause and
engine repair
Defective spark plugs Replace spark plugs
Spark plugs fouled Replace spark plugs









\









\









\









\









\









\









\







BASIC DRIVEABILITY PROBLEMS TROUBLE SHOOTING TABLE








\









\









\









\









\









\









\







CONDITION POSSIBLE CAUSE CORRECTION








\









\









\









\









\









\









\







Hard Starting Binding carburetor linkage Eliminate binding
Binding choke linkage Eliminate binding
Binding choke piston Eliminate binding
Restricted choke vacuum Check vacuum lines
for blockage