Daewoo MATIZ Service Manual page 394

1F – 296 ENGINE CONTROLS
Definition: Fuel economy, as measured by an actual
road test, is noticeably lower than expected. Also, fuel
economy is noticeably lower than it was on this vehicle
at one time, as previously shown by an actual road test.
Important: Driving habits affect fuel economy. Check
the owner's driving habits by asking the following ques-
tions:
Step
Were the Important Preliminary Checks performed?
1
1. Inspect the air filter for excessive contamination.
2 2. Inspect for fuel system leaks.
Are all needed checks complete?
1. Inspect the spark plugs for excessive wear,
insulation cracks, improper gap, or heavy
deposits.
2. Replace any faulty spark plugs.
3
3. Inspect the ignition wires for cracking, hardness,
and proper connections.
Are all needed checks and repairs complete?
1. Inspect the engine coolant level.
2. Check the thermostat for being always open or for
an incorrect heat range.
4
3. Replace the thermostat as needed.
Are all needed checks and repairs complete?
1. Check the transaxle shift pattern. Ensure all
transaxle gears are functioning.
2. Check for proper calibration of the speedometer.
3. Check the brakes for dragging.
5
4. Check the cylinder compression.
5. Repair, replace, or adjust any components as
needed.
Are all checks and needed repairs complete?
POOR FUEL ECONOMY
Action
1. Is the A/C system (i.e. defroster mode) turned on all
the time?
2. Are the tires at the correct air pressure?
3. Have excessively heavy loads been carried?
4. Does the driver accelerate too much and too often?
Suggest the driver read the section in the owner's
manual about fuel economy.
Value(s)
–
Go to Step 2
–
Go to Step 3
–
Go to Step 4
–
Go to Step 4
–
System OK
Yes No
Go to
"Important
Preliminary
Checks"
–
–
–
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DAEWOO M-150 BL2