Mitsubishi Montero (1991+). Manual — part 306

Does Not Close battery as necessary

Faulty wiring Check all wiring and

connections leading to

relay

Neutral safety switch Replace neutral safety

faulty switch

Starter relay faulty Replace starter relay

Starter Drive Starter motor loose on Tighten starter

Will Not mountings attach bolts

Disengage

Worn drive end bushing See STARTER article

Damaged engine flywheel Replace flywheel and

teeth starter pinion gear for

damage

Drive yolk return spring Replace return spring

broken or missing

Faulty ignition switch Replace ignition switch

Insufficient clearance Replace starter

between winding leads to solenoid

solenoid terminal and main

contact in solenoid

Starter clutch not Replace starter clutch

disengaging

Ignition starter switch Replace ignition switch

contacts sticking

Starter Relay Faulty solenoid switch, Check all wiring

Operates but switch connections or between relay and

Solenoid Does Not solenoid or replace

relay or solenoid as

necessary

Broken lead or loose Repair wire or wire

soldered connections connections as

necessary

Solenoid Plunger Weak battery Charge or replace

Vibrates When battery as necessary

Switch is Engaged

Solenoid contacts Clean contacts or

corroded replace solenoid

Faulty wiring Check all wiring

leading to solenoid

Broken connections inside Repair connections or

switch cover replace solenoid

Open hold-in wire Replace solenoid

Low Current Draw Worn brushes or weak Replace brushes or

brush springs as

necessary

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

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

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

CONDITION POSSIBLE CAUSE CORRECTION

Normal Spark Light Tan or Gray deposits No Action

Plug Condition

Electrode not burned or No Action

fouled

Gap tolerance not changed No Action

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

Wet Fouling Worn rings and pistons Install new rings and

or Oil Deposits pistons

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