Mitsubishi Montero (1998+). Manual - part 350

 

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Mitsubishi Montero (1998+). Manual - part 350

 

 

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

 

 

 

 

 

 

 

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