Detonation/Spark Knock - Daewoo CIELO EURO III Manual

1F – 370 ENGINE CONTROLS
Lack of Power, Sluggishness, or Sponginess (Cont'd)
Step
Repair or replace any engine components as need-
ed.
15
Is the repair complete?
1. Check the
engine control module (ECM) grounds for
being clean, tight, and in their proper location.
2. Check the Exhaust Gas Recirculation (EGR)
Valve for being open or partially open all the time.
16
4. Check the A/C system operation.
5. Check the generator output.
6. Repair the generator if the output is not within the
specified range.
Are all checks and repairs complete?
Step
Were the Important Preliminary Checks performed?
1
1. Fill the fuel tank with a known good grade of
gasoline that has the octane rating of the value
specified.
2
2. Reevaluate the vehicle's performance.
Does the detonation problem still exist?
1. Inspect for low engine coolant.
2. Check for restricted air flow to the radiator or
restricted coolant flow.
3
3. Check for a faulty thermostat.
4. Check for an incorrect coolant solution.
Is the problem found?
Repair or replace any cooling system components
as needed.
4
Is the repair complete?
1. Check the voltage using the scan tool.
2. Replace the Engine Coolant Temperatue (ECT)
5 sensor if the resistance is not within specifications
as listed in DTC P1114.
Is the problem found?
Replace the ECT sensor or repair the circuit as
needed.
6
Is the repair complete?
1. Check the ignition system output with a spark
tester.
2. Inspect the spark plugs for the proper heat range
and gap.
7
3. Check for the proper operation of the ignition
controls.
Is the ignition system operating properly?
Action

DETONATION/SPARK KNOCK

Action
Value(s) Yes
–
System OK
12-16 v System OK
Value(s) Yes
–
Go to Step 2
81-95 octane Go to Step 3
–
Go to Step 4
–
System OK
–
Go to Step 6
–
System OK
–
Go to Step 9
No
–
–
No
Go to
"Important
Preliminary
Checks"
System OK
Go to Step 5
–
Go to Step 7
–
Go to Step 8
DAEWOO T-154 BL2,3