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Daewoo Matiz (2003 year). Manual - part 2

1A – 6 GENERAL ENGINE INFORMATION

GENERAL DIAGNOSIS (Cont’d)

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Condition

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Probable cause

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Correction

Hard Starting (With

Others

Broken timing belt.

Replace the belt.

normal cranking)

Malfunction of Positive
Crankcase Ventilation (PCV)
valve.

Check and replace Positive
Crankcase Ventilation (PCV)
valve if needed.

Loosening, damage or
leakage of the vacuum hose.

Connect the hose correctly
or replace it.

Leakage of intake system.

Replace intake system.

Lack of Engine Power

Decline of
Compression
Pressure

Refer to “Page 1A–5”.

Malfunction of

Improper ignition timing.

Adjust the ignition timing.

Ignition System

Faulty spark plug.

Adjust or replace the spark
plug.

Malfunction of the distributor.

Repair or replace the
distributor. Check the rotor.

Electric leakage or poor
connection of the high
tension cable.

Connect the cable correctly
or replace it.

Malfunction of

Clogged fuel pipe.

Clean the pipe.

Fuel System

Clogged or contaminated
fuel filter.

Replace the filter.

Others

Clogged exhaust system.

Check and repair the
system.

Clogged or contaminated air
cleaner element.

Clean or replace the air
cleaner element.

Leak of the intake manifold
gasket.

Replace the gasket.

Dragging brakes.

Repair or replace the
brakes.

Slipping clutch.

Adjust or replace the clutch.

Rough Engine Idling

Decline of
Compression
Pressure

Refer to “Page 1A–5”.

Malfunction of

Clogged fuel pipe.

Clean the pipe.

Fuel System

Clogged or contaminated
fuel filter.

Replace the filter.

Malfunction of the fuel
pressure regulator.

Replace the regulator.

Malfunction of
Ignition System

Malfunction of the spark
plug.

Adjust or replace the spark
plug.

Electric leakage or poor
connection of the high
tension cable.

Connect the cable correctly
or replace it.

Worn distributor cap terminal
or accumulated carbon in
the distributor cap.

Replace or clean the
distributor cap.

GENERAL ENGINE INFORMATION 1A – 7

GENERAL DIAGNOSIS (Cont’d)

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Condition

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Probable cause

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Correction

Rough Engine Idling

Malfunction of
Ignition System

Loosening or damage of the
distributor rotor or cap.

Replace the rotor or cap.

Poor ignition timing.

Adjust the ignition timing.

Malfunction of the ignition
coil.

Replace the ignition coil.

Others

Clogged or contaminated air
cleaner element.

Clean or replace the air
cleaner element.

Leak of the intake manifold
gasket.

Replace the gasket.

Malfunction of Positive
Crankcase Ventilation (PCV)
valve.

Check the valve or replace it
if needed.

Poor connection or damage
or leakage of the vacuum
hose.

Connect the hose correctly
or replace it.

Engine Hesitate (Upon
pressing accelerating
pedal, the engine

Decline of
Compression
Pressure

Refer to “Page 1A–5”.

makes delayed
response. This

Malfunction of

Poor ignition timing.

Adjust the ignition timing.

response. This
situation is remarkable
when cruising or

Ignition System

Poor spark plug or poor
adjustment of the plug gap.

Replace the plug or adjust
the gap.

starting.)

Electric leakage or poor
connection of the high
tension cable.

Connect the cable correctly
or replace it.

Others

Malfunction of the air cleaner
system.

Clean or replace the air
cleaner system.

Leak of the intake manifold
gasket.

Replace the gasket.

Engine Surging
(Engine power makes
fluctuation in a fixed

Decline of
Compression
Pressure

Refer to “Page 1A–5”.

speed and speed
changes without

Malfunction of

Clogged fuel pipe.

Clean the pipe.

changes without
operating the
accelerating pedal.)

Fuel System

Clogged or contaminated
fuel filter.

Replace the filter.

Malfunction of the fuel
pressure regulator.

Replace the fuel pressure
regulator.

Malfunction of
Ignition System

Malfunction of the spark
plug.

Adjust or replace the spark
plug.

Electric leakage or poor
connection of the high
tension cable.

Connect the cable correctly
or replace it.

Worn distributor cap terminal
or accumulated carbon in
the distributor cap.

Clean or replace the
distributor cap.

Loosening or damage of the
distributor rotor or the cap.

Replace the distributor rotor
or the cap.

Poor ignition timing.

Adjust the ignition timing.

1A – 8 GENERAL ENGINE INFORMATION

GENERAL DIAGNOSIS (Cont’d)

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Condition

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Probable cause

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Correction

Engine Surging
(Engine power makes
fluctuation in a fixed

Others

Leak of the intake manifold
gasket.

Clean or replace the gasket.

speed and speed
changes without
operating the
accelerating pedal.)

Leakage of the vacuum hose.

Connect the hose correctly
or replace it.

Excessive Detonation
(According to the

Overheated
Engine

Refer to “Overheat” in this
page.

opening range of
throttle valve,

Malfunction of

Abnormal spark plug.

Replace the spark plug.

knocking sound of
metallic is made with

Ignition System

Poor ignition timing.

Adjust the ignition timing.

metallic is made with
abnormal explosion.)

Electric leakage or poor
connection of the high tension
cable.

Connect the cable correctly
or replace it.

Malfunction of
Fuel System

Clogged or contaminated fuel
filter and fuel pipe.

Clean or replace the fuel
filter and the fuel pipe.

Others

Leak of the intake manifold
gasket.

Replace the gasket.

Excessive carbon deposit due
to abnormal combustion.

Remove the carbon.

Overheat

Malfunction of

Lack of coolant.

Refill coolant.

Cooling System

Malfunction of the thermostat.

Replace the thermostat.

Malfunction of the cooling fan.

Check or replace the cooling
fan.

Poor water pump
performance.

Replace the pump.

Clogged or leaky radiator.

Clean, repair or replace the
radiator.

Malfunction of
Lubrication

Poor engine oil.

Replace engine oil with the
specified one.

System

Blocking oil filter or strainer.

Clean or replace the oil filter
or the strainer.

Lack of engine oil.

Refill oil.

Poor oil pump performance.

Replace or repair the pump.

Leakage of oil.

Repair.

Other

Damaged cylinder head
gasket.

Replace the gasket.

Poor Fuel
Consumption

Decline of
Compression
Pressure

Refer to “Page 1A–5”.

Malfunction of
Fuel System

Leakage of the fuel tank or
the fuel pipe.

Repair or replace the fuel
tank or the fuel pipe.

GENERAL ENGINE INFORMATION 1A – 9

GENERAL DIAGNOSIS (Cont’d)

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Condition

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Probable cause

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Correction

Poor Fuel

Malfunction of

Improper ignition timing.

Adjust the ignition timing.

Consumption

Ignition System

Abnormal spark plug
(Excessive carbon deposit,
inadequate gap, burnt
electrode).

Replace the plug.

Electric leakage or poor
connection of the high
tension cable.

Connect the cable normally
or replace it.

Malfunction of
Cooling System

Malfunction of the
thermostat.

Replace the thermostat.

Others

Improperly installed valve.

Repair or replace the valve.

Slipping clutch.

Repair or replace the clutch.

Low pressure of tires.

Adjust the pressure of tires.

Excessive

Leakage of

Loosened oil drain plug.

Tighten the plug.

Consumption of
Engine Oil

Engine Oil

Loosened oil pan bolt.

Tighten the bolt.

Engine Oil

Loosened oil filter.

Tighten the filter.

Loosened oil pressure
switch.

Tighten the switch.

Leakage of camshaft front oil
seal.

Replace the seal.

Leakage of crankshaft front
oil seal.

Replace the seal.

Leakage at the cylinder head
cover gasket.

Replace the gasket.

Damage of the cylinder head
gasket.

Replace the gasket.

Oil Mixing in
Combustion

Stuck piston ring.

Remove carbon and replace
the ring.

Chamber

Worn piston or cylinder.

Replace the piston or the
cylinder.

Worn piston ring or ring
groove.

Replace the piston or ring.

Inadequate position of the
piston ring cutting part.

Adjust the position.

Abrasion or damage of the
valve system.

Replace the valve system.

Low Oil Pressure

Malfunction of
Lubrication

Inadequate oil viscosity.

Replace with the specified
one.

System

Loosening of the oil pressure
switch.

Tighten the switch.

Lack of engine oil.

Refill oil.

Blocking oil strainer.

Clean the strainer.

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