Mitsubishi Montero (1991+). Manual — part 303

cracked or broken manifold, See ENGINES

ENGINE PERFORMANCE

CARBURETOR TROUBLE SHOOTING:

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 COLD START SYMPTOMS TROUBLE SHOOTING CHART

CONDITION POSSIBLE CAUSE CORRECTION

Engine Won’t Choke not closing Check choke

Start operation, see

FUEL SYSTEMS

Choke linkage bent Check linkage, see

FUEL SYSTEM

Engine Starts, Choke vacuum kick setting Check setting and

Then Dies too wide adjust see, FUEL

SYSTEMS

Fast idle RPM too low Reset RPM to specif-

ication, see TUNE-UP

Fast idle cam index Reset fast idle cam

incorrect index, see FUEL

SYSTEMS

Vacuum leak Inspect vacuum

system for leaks

Low fuel pump outlet Repair or replace

pump, see FUEL

SYSTEMS

Low carburetor fuel level Check float setting

see FUEL SYSTEM

Engine Quits Choke vacuum kick setting Reset vacuum kick

Under Load incorrect setting,see FUEL

SYSTEMS

Fast idle cam index Reset fast idle cam

incorrect index, see FUEL

SYSTEM

Incorrect hot fast idle Reset fast idle RPM,

speed RPM see TUNE-UP

Engine Starts, Choke vacuum kick set too Reset vacuum kick,

Runs Up,Then narrow see FUEL SYSTEMS

Idles, Slowly

With Black Smoke Fast idle cam index Reset fast idle cam

incorrect index, see FUEL

SYSTEMS

Hot fast idle RPM too low Reset fast idle RPM,

see TUNE-UP

BASIC HOT START SYMPTOMS TROUBLE SHOOTING CHART

CONDITION POSSIBLE CAUSE CORRECTION

Engine Won’t Engine flooded Allow fuel to

Start evaporate

BASIC COLD ENGINE DRIVEABILITY SYMPTOMS TROUBLE SHOOTING CHART

CONDITION POSSIBLE CAUSE CORRECTION

Engine Stalls in Choke vacuum kick setting Reset choke vacuum

Gear incorrect kick, see FUEL

SYSTEMS

Fast idle RPM incorrect Reset fast idle RPM,

see TUNE-UP

Fast idle cam index Reset fast idle cam

incorrect see FUEL SYSTEMS

Acceleration Sag Defective choke control Replace choke

or Stall switch control switch

Choke vacuum kick setting Reset choke vacuum

incorrect kick see, FUEL

SYSTEMS

Float level incorrect Adjust float level,

(too low) FUEL SYSTEMS

Accelerator pump defective Repair or replace

pump see FUEL

SYSTEMS

Secondary throttles not Inspect lockout

closed adjustment,see FUEL

SYSTEMS

Sag or Stall Defective choke control Replace choke

After Warmup switch control switch, see

FUEL SYSTEMS

Defective accelerator pump Replace pump, see

FUEL SYSTEMS

Float level incorrect Adjust float level,

(too low) see FUEL SYSTEMS

Backfiring & Plugged heat crossover Remove restriction

Black Smoke system

BASIC WARM ENGINE DRIVEABILITY SYMPTOMS TROUBLE SHOOTING CHART

CONDITION POSSIBLE CAUSE CORRECTION

Hesitation With Vacuum leak Inspect vacuum lines

Small Amount of

Gas Pedal Movement

Accelerator pump weak or Replace pump, see

inoperable FUEL SYSTEMS

Float level setting too low Reset float level,

see,FUEL SYSTEMS

Metering rods sticking or Inspect and/or

binding replace rods, see

FUEL SYSTEMS

Carburetor idle or transfer Inspect system and

system plugged remove restriction

Frozen or binding heated air Inspect heated air

inlet door for binding

Hesitation With Defective accelerator pump Replace pump, see

Heavy Gas Pedal FUEL SYSTEMS

Movement

Metering rod carrier Remove restriction

sticking or binding

Large vacuum leak Inspect vacuum

system and repair

leak

Float level setting too Reset float level,

low see FUEL SYSTEMS

Defective fuel pump, lines Inspect pump, lines

or filter and filter

Air door setting incorrect Adjust air door

setting, see FUEL

DIESEL ENGINE TROUBLE SHOOTING

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.

NOTE: Diesel engines mechanical diagnosis is the same as gasoline

engines for items such as noisy valves, bearings, pistons,

etc. The following trouble shooting covers only items

pertaining to diesel engines.

BASIC DIESEL ENGINE TROUBLE SHOOTING CHART

CONDITION POSSIBLE CAUSE CORRECTION

Engine Won’t Bad battery connections Check connections

Crank or dead batteries and/or replace

batteries

Bad starter connections Check connections

or bad starter and/or replace

batteries

Engine Cranks Bad battery connections Check connections

Slowly, Won’t or dead batteries and/or replace

Start batteries

Engine oil too heavy Replace engine oil

Engine Cranks Glow plugs not functioning Check glow plug system,

Normally, But see FUEL SYSTEMS

Will Not Start Glow plug control not Check controller, see

functioning FUEL SYSTEMS

Fuel not injected into Check fuel injectors,

cylinders see FUEL SYSTEMS

No fuel to injection pump Check fuel delivery

system

Fuel filter blocked Replace fuel filter

Fuel tank filter blocked Replace fuel tank

filter

Fuel pump not operating Check pump operation

and/or replace pump

Fuel return system blocked Inspect system and

remove restriction

No voltage to fuel solenoid Check solenoid and

connections

Incorrect or contaminated Replace fuel

fuel

Incorrect injection pump Re-adjust pump timing,

timing see FUEL SYSTEMS

Low compression Check valves, pistons,

rings, see ENGINES

Injection pump malfunction Inspect and/or replace

injection pump

Engine Starts, Incorrect slow idle Reset idle adjustment,

Won’t Idle adjustment see TUNE-UP

Fast idle solenoid Check solenoid and

malfunctioning connections

Fuel return system blocked Check system and remove

restrictions

Glow plugs go off too soon See glow plug diagnosis

in FUEL SYSTEMS

Injection pump timing Reset pump timing, see

incorrect FUEL SYSTEMS

No fuel to injection pump Check fuel delivery

system

Incorrect or contaminated Replace fuel

fuel

Low compression Check valves, piston,

rings, see ENGINES

Injection pump malfunction Replace injection pump,

see FUEL SYSTEMS

Fuel solenoid closes in RUN Check solenoid and

position connections

Engines Starts/ Incorrect slow idle Reset slow idle, see

Idles Rough W/out adjustment TUNE-UP

Smoke or Noise Injection line fuel leaks Check lines and

connections

Fuel return system blocked Check lines and

connections