8-169 MITSUBISHI ECLIPSE 1991 Service Manual

INTRODUCTION AND MASTER TROUBLESHOOTING - Mast& Tro6blerhootbia
MASTER TROUBLESHOOTING7 *
I,._ ,...
r. ENGINE OVERHEATSi ”
SymptomEngine overheatsProbable causeCooling system faulty
Incorrect ignition timingReference page: I._),7-5
8-169
ENGINE WILL NOT CRANK OR CRANKS SLOWLY
SymptomEngine will not crank
or cranks slowlyProbable causeStarting system faulty
,’
Reference page8-153
ENGINE WILL NOT START OR
HbRD TO START (CRANKS OK)
SymptomProbable causeReference page
Engine will not start or hard toNo fuel supply to injector
-start (Cranks OK)
Injection system problems
-Ignition system problems
8-16!$/ ”;Vacuum leaks11-5..“,:’l Purge control valve hose25-4
l Vacuum hoses
l Intake manifoldl Air intake plenum
l Throttle body
l EGR valveCompression too low
g-23,‘, :. ” ‘,;A;ROUGH IDLE OR ENGINE STALL
Symptom
Rough idle or engine stallsProbable cause
Vacuum leaks
l Purge control valve hosel Vacuum hosesl Intake manifoldl Air intake plenuml Throttle bodyl EGR valve
“. ._
Reference page or remedy
11-525-4
Ignition system problems
Idle speed set too low8-169Check idle speed control sys-
tem
Idle mixture too lean or too rich
Fuel injection system problems
Exhaust gas recirculation
(EGR) system
problems
Engine overheatsCompression too low
-
-
25-l 57-5
9-23

30INTRODUCTION AND MASTER TROUBLESHOOTING - Master Troubleshooting
ENGINE HESITATES OR POOR ACCELERATION
SymptomEngine hesitates or poor
accelerationProbable causeIgnition system problem
Vacuum leaks
l Purge control valve hose
l Vacuum hosesl Intake manifoldl Air intake plenum
l Throttle bodyl EGR valveReference page
8-169
11-525-4
Air cleaner clogged
Fuel line clogged
Fuel injection system problem
Emission control system problem
l EGR system always on
Engine overheats
Compression too low
-
-
-25-15
7-5
9-23
ENGINE
DIESELING
SymptomEngine dieseling (runs after
ignition switch is turned off)Probable causeIncorrect ignition timingReference page
8-169
EXCESSIVE OIL CONSUMPTION
Symptom
Excessive oil consumptionProbable cause
Oil leak
Positive crankcase ventilation line clogged.
Valve stem seal worn or damaged.Valve stem worn.
Piston ring worn or damaged.Reference page or remedy
Repair as necessary.25-7
g-55.114
g-55.114
g-66,128

INTRODUCTION AND MASTER TROUBLESH’OOTING .- Master ~pAi&oOti~31POOR FUEL MILEAGE
../, *,, /S./..‘, _I, #_.a,‘.rr?
Symptom
Poor fuel mileageProbable cause
Fuel leak
Air cleaner clogged.Ignition system problems
Reference page or remedy”Repair as necessary.
-8-169
IFuel injection system problems.I-ICompression too low.9-23
Tires improperly inflated.22-3
Clutch slips.6-4
Brakes drag.5-7I
NOISE
Symptom
NoiseProbable cause
Loose bolts and nuts.
Engine noiseReference page or remedy
Retighten as necessary
9-23
’
HARD STEERING
Symptom
Hard steeringProbable causeLoose power steering oil pump belt
Low fluid levelAir in power steering system
Low tire pressure
Reference page or remedy19-12
Replenish19-13
22-3
Excessive turning resistance of lower arm ballExcessively tightened of steering gear box
IImproper front wheel alignment2-8
Excessive turning resistance of tie-rod ballioint2-35
1 i-23.30
19-8.10Sticky flow control valve
Bent rack in steering gear box‘.19-4119-23.30
POOR RETURN OF STEERING WHEEL TO CENTERSymptom
1Probable causeIReference pageI
Poor return of steering wheel tocenterImproper front wheel alignment
2-8
Improper tire pressure22-3
Excessive tightened rack support cover19-23.30
I-- ~~~Damaged front wheel bearingI2-12I