1991 MITSUBISHI 3000GT mileage

00-26GENERAL - Master Troubleshooting
ENGINE DIESELING
Symptom
Engine dieseling (runs afterignition switch is turned off)
Probable cause
Incorrect ignition timing
Reference page
11-13EXCESSIVE OIL CONSUMPTION
ISymptomProbable cause( Reference page or remedy(
Excessive oil consumptionOil leakRepair as necessary
Positive crankcase ventilation line clogged
Valve stem seal worn or damaged
17-5
11-34
I----Valve stem worn11-34I
IPiston ring worn or damaged11-44IPOOR FUEL MILEAGE
NOISE
SymptomProbable causeReference page or remedy
NoiseLoose bolts and nutsRetighten as necessary
Engine noise
il-10
) TSB Revision

GENERAL - Lubrication and Maintenance00-31LUBRICATION AND MAINTE-
NANCEMOOPA- -
iiMaintenance and lubrication service recommenda-
tions have been compiled to provide maximum
protection for the vehicle owner’s investment
against all reasonable types of driving conditions.
Since these conditions vary with the individual
vehicle owner’s driving habits, the area in which the
vehicle is operated and the type of driving to which
the vehicle is subjected, it is necessary to prescribe
lubrication and maintenance service on a time
frequency as well as mileage interval basis.
Oils, lubricants and greases are classified and
graded according to standards recommended by the
Society of Automotive Engineers
(SAE), the Amer-
ican Petroleum Institute (API) and the National
Lubricating Grease Institute
(NLGI).MAINTENANCE SCHEDULES
Information for service maintenance is provided
under “SCHEDULED MAINTENANCE TABLE”.
Three schedules are provided; one for “Required
Maintenance”, one for “General Maintenance” and
one for “Severe Usage Service”.
Item numbers in the “SCHEDULED MAINTE-
NANCE TABLE” correspond to the item numbers in
the “MAINTENANCE SERVICE” section.
LSEVERE SERVICE
Vehicles operating under severe service conditions
will require more frequent service.
Component service information is included in
appropriate units for vehicles operating under one or
more of the following conditions:
1. Police, taxi, or commercial type operation
2. Operation of Vehicle
(1) Short-trip operation at freezing temperature
(engine not thoroughly warmed up)
(2) More than 50% operation in heavy city
traffic during hot weather above 32°C
(90°F)(3) Extensive idling
(4) Driving in sandy areas
(5) Driving in salty areas
(6) Driving in dusty conditions
ENGINE OIL
The SAE grade number indicates the viscosity of
engine oils, for example, SAE 30, which is a single
grade oil. Engine oils are also identified by a dual
number, for example, SAE 1 OW-30, which indicates
a multigrade oil.
The API classification system defines oil perform-
ance in terms of engine usage. Only engine oil
idesigned “For Service SG” or “For Service
SGXD”,when available, should be used. These oils contain
sufficient chemical additives to provide maximumengine protection. Both the SAE grade and the API
designation can be found on the container.
Caution
Test results submitted to EPA have shown thatlaboratory animals develop skin cancer after
prolonged contact with used engine oil. Accor-dingly, the potential exists for humans to de-
velop a number of skin disorders, including
cancer, from such exposure to used engine oil.
Care should be taken, therefore, when changing
engine oil, to minimize the amount and length ofexposure time to used engine oil on your skin.
Protective clothing and gloves, that cannot be
penetrated by oil, should be worn. The skin
should be thoroughly washed with soap and
water, or use waterless hand cleaner, to removeany used engine oil. Do not use gasoline,
thinners, or solvents.GEAR
LUEiRlCANTSThe SAE grade number also indicates the viscosity
of Multi-Purpose Gear Lubricants.
The API classification system defines gear lubri-
cants in terms of usage. Typically gear lubricants
conforming to API GL-4 or GL-5 with a viscosity of
SAE
75W-85W are recommended for manual trans-
axle.
LUBRICANTS
- GREASES
Semi-solid lubricants, bear the
NLGI designation and
are further classified as grades 0, 1, 2, 3 etc.
Whenever “Chassis Lubricant” is specified,
Multi-Purpose Grease,
NLGI grade 2, should be used.
FUEL USAGE STATEMENT
Use premium unleaded gasoline having a minimum
octane rating of 91,
(R + M)/2. However, it is also
possible to use unleaded gasoline with an octane
rating of at least 87.
Unleaded gasolines only must be used in vehicles
equipped with catalyst emission control systems.
All vehicles, so equipped, have labels located on the
instrument panel and on the back of fuel filler lid that
state, “UNLEADED GASOLINE ONLY”. These vehi-
cles also have fuel filler tubes especially designed to
accept the smaller diameter unleaded gasoline
dispensing nozzles only.
MATERIALS ADDED TO FUEL
Indiscriminate use of fuel system cleaning agents
should be avoided. Many of these materials in-
tended for gum and varnish removal may contain
highly active solvents or similar ingredients that can
be harmful to gasket and diaphragm materials used
in fuel system component parts.
1 TSB Revision

GENERAL - Scheduled Maintenance Table00-35
SCHEDULED MAINTENANCE TABLE
MOOOA- _SCHEDULED MAINTENANCE SERVICES FOR EMISSION CONTROL AND PROPER
L VEHICLE PERFORMANCE
Inspection and services should be performed any time a malfunction is observed or suspected. Retain
receipts for all vehicle emission services to protect your emission warranty.
No, Emission Control SystemServiceKilometersinThousands 24 48 72 80 96
MaintenanceIntervalsMileage in Thousands 15 30 45 50 60
1Check Fuel System (Tank. Line and Connections and Fuel Filler Cap) forLeaks Every 5 Yearsorx
2Check Fuel Hoses for Leaks or Damage Every 2 YearsorXX
3Replace Air Cleaner ElementatXX
4Replace Spark PlugsatXGENERAL MAINTENANCE SERVICE FOR PROPER VEHICLE PERFORMANCE
-
10.
-
5-
6-
7
-
8
-
9-
10
-
11-
12-
13
-
14
-
15
-
16
-
17
-
General Maintenance
Automatic Transaxle Fluid
Exhaust System (ConnectionCheck and Service as RequiredPortion of Muffler, Pipings andEvery 2 YearsorXXConverter Heat Shields)
NOTELSD: Limited-slip differential
TSB Revision

00-36GENERAL - Scheduled Maintenance Table / Maintenance Service
SCHEDULED MAINTENANCE UNDER SEVERE USAGE CONDITIONS
The maintenance items should be performed according to the following table:
Mileage Intervals Kilometers in ThousandsSevere Usage
MaintenanceService to be(Miles in Thousands)Conditions
itemPerformed
(6 (15) (22.5) (30) (37.5) (45) (50) (52.5) (60)24 36 48 60 72 80 84 96 A B C D E F G
Air Cleaner ElementReplaceMore FrequentlyXX
Spark PlugsReplaceXXXXXX
Engine OilChange Every Or3 MonthsEvery 4,800 Km (3,000 Miles)x x x xX
Engine Oil FilterReplace Every or6 MonthsEvery 9,600 Km (6.000 Miles)x x x xX
Disc Brake PadsInspect for WearMore FrequentlyXX
Severe usage conditions
A-Driving in dusty conditionsE -B -Police, taxi, or commercial type operationF -Driving in sandy areas
C -Extensive idlingG -Driving in salty areas
D -Short trip operation at freezing temperaturesMore than 50% operation in heavy city traffic during
(engine not thoroughly warmed up)hot weather above 32°C (90°F)MAINTENANCE SERVICE
1. FUEL SYSTEM (TANK, LINES, CONNECTIONS
AND FUEL FILLER CAP) (Check for leaks)
/ 2.
FUEL HOSES (Check for leaks or damage)MWShGC
1. Check for damage or leakage in the fuel lines and
connections and looseness of the fuel filler cap.
2.Inspect the surface of fuel hoses for heat and mechanical
damage. Hard and brittle rubber, cracking, checking, tears,
cuts, abrasions and excessive swelling indicate deteriora-
tion of the rubber.
3.If the fabric casing of the rubber hose is exposed by cracks
and abrasions in the fuel system, the hoses should be
changed.
TSB Revision

17-2EMISSION CONTROL - Specifications / Troubleshooting
SPECIFICATIONS
GENERAL SPECIFICATIONSMl’ICA- -\
Items
Crankcase emission control systemSpecifications
Closed type with positive crankcase ventilationvalve
Evaporative emission control systemCanister storage type
Canister
Charcoal type
Purge control solenoid valve
ON/OFF solenoid valve
Exhaust emission control system
Exhaust gas recirculation system
EGR valveVacuum-activated diaphragm type
EGR temperature sensor Thermistor type
EGR control solenoid valve - Non Turbo, Turbo>Duty cycle solenoid valve
Catalytic converter
Monolith type
Location
Under floor
Turbocharger outlet (front bank and rear bank,)
and under floor
SERVICE SPECIFICATIONSMl7CB-.
ItemsSpecifications
Purge control solenoid valve coil resistance
036 - 44 [at 20°C (68”F)I\
EGR temperature sensor resistancekfl60 - 83 [at 50°C (I 22”F)]
11 - 14 [at 100°C (212”F)l
EGR control solenoid valve coil resistance1236 - 44 [at 20°C (68”F)lI
TROUBLESHOOTING
Symptom
Engine will not start
or hard to start
Rough idle or engine
stalls
Probable cause
Vacuum hose disconnected or damaged
The EGR valve is not closed
Malfunction of the purge control solenoid valve
The EGR valve is not closed
Vacuum hose disconnected or damaged
Malfunction of the positive crankcase ventilationvalveRemedy
Repair or replace
Repair or replace
Repair or replace
Repair or replace
Repair or replace
Replace
Malfunction of the purge control systemCheck the system; if there is a
problem, check its component parts
Engine hesitates or3oor acceleration
Zxcessive oil:onsumptron
Malfunction of the exhaust gas recirculation
system
Positive crankcase ventilation line cloggedCheck the system; if there is a
problem, check its component parts
Check positive crankcase
ventila-tion system
Ioor fuel mileageMalfunction of the exhaust gas recirculation
systemTSB RevisionCheck the system; if there is a
problem, check its component parts
d