Checks
| Action
|
DEFINITION: A mild to severe ping, usually worse under
acceleration. The engine makes sharp metallic knocks that change
with throttle opening.
|
Preliminary
|
|
Fuel System
|
| • | Check for items that cause the engine to run lean. |
|
Ignition System
| Check the spark plugs. Refer to
Spark Plug Inspection
|
Engine Cooling System
| Check for causes
of overheating:
| • | Restricted air flow to radiator, or restricted coolant flow through
the radiator. Refer to
Engine Overheating
in Engine Cooling. |
|
Engine Mechanical
|
| • | Check for excessive oil in the combustion chamber-leaking valve
seals. |
| • | Check the combustion chamber for excessive carbon buildup. Clean
using Top Engine Cleaner. |
| • | Check for incorrect basic engine parts. Inspect the following: |
|
Additional Checks
|
| • | Check the torque converter clutch (TCC) system for proper operation.
Refer to
Torque Converter Diagnosis
in Automatic Transaxle. |
| • | If the scan tool readings are normal, and there are no engine
mechanical faults, fill the fuel tank with a premium gasoline that
has a minimum octane reading of 92 and re-evaluate the vehicle. |
|
