Detonation/Spark Knock - Daewoo Nubira Owner's Manual

Step
14
1. Check the cylinder compression and valve tim-
ing.
2. Inspect the camshaft for excessive wear.
Is the problem found?
15 Repair or replace any engine components as need-
ed.
Is the repair complete?
16
1. Check the powertrain control module
(PCM)/engine control module (ECM) grounds
for being clean, tight, and in their proper loca-
tion.
2. Check the Exhaust Gas Recirculation (EGR)
valve for being open or partially open all the
time.
3. Check the Torque Converter Clutch (TCC) op-
eration.
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
1 Were the Important Preliminary Checks performed?
2
1. Fill the fuel tank with a known good grade of
gasoline that has the octane rating of the value
specified.
2. Reevaluate the vehicle's performance.
Does the detonation problem still exist?
3
1. Inspect for low engine coolant.
2. Check for restricted airflow to the radiator or
restricted coolant flow.
3. Check for a faulty thermostat.
4. Check for an incorrect coolant solution.
Is the problem found?
4 Repair or replace any cooling system components
as needed.
Is the repair complete?
5
1. Check the voltage using the scan tool.
2. Replace the Engine Coolant Temperature
(ECT) sensor if the resistance is not within
specifications as listed in the Diagnostic Aids
for diagnostic trouble code (DTC) P0118.
Is the problem found?
6 Replace the ECT sensor or repair the circuit as
needed.
Is the repair complete?
DAEWOO V–121 BL4
Action

DETONATION/SPARK KNOCK

Action
ENGINE CONTROLS 1F – 365
Value(s) Yes
Go toStep 15
System OK
12–16 v System OK
Value(s) Yes
Go toStep 2
87–89 octane Go toStep 3
Go toStep 4
System OK
Go toStep 6
System OK
No
Go toStep 16
No
Go to"Impor-
tant Preliminary
Checks"
System OK
Go toStep 5
Go toStep 7