fuel consumption DAEWOO MATIZ 2003 Service Repair Manual

1A–8 GENERAL ENGINE INFORMATION
DAEWOO M-150 BL2
GENERAL DIAGNOSIS (Cont’d)
 
 Condition
 
 Probable cause
 
 Correction
Engine Surging
(Engine power makes
fluctuation in a fixedOthers
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 theOverheated
Engine
Refer to “Overheat” in this
page.
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 withIgnition 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.
OverheatMalfunction 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
ConsumptionDecline of
Compression
Pressure
Refer to “Page 1A–5”.
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
DAEWOO M-150 BL2
GENERAL DIAGNOSIS (Cont’d)
 Condition Probable cause Correction
Poor FuelMalfunction of
Improper ignition timing.
Adjust the ignition timing.
ConsumptionIgnition 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.
ExcessiveLeakage of
Loosened oil drain plug.
Tighten the plug.
Consumption of
Engine OilEngine 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 PressureMalfunction 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.