Diagnosing the state of the spark plugs is an effective method for elucidating the cause of engine troubles.
The flowing trouble can be caused by engine defects.
|Case 1||Starting defect
Misfiring when idling
Misfiring during normal running
|Case 2||Misfiring only when running at high speed or when accelerating suddenly||Diagnosis 2|
|Case 3||Loss of power when running at high speed or under high load Piston breakdown||Diagnosis 3|
|Case 4||Trouble other than with the engine||Diagnosis 4|
Spark plug state
- Starting defect
- Misfiring when idling
- Misfiring during normal running
- Misfiring only when running at high speed or when accelerating suddenly
- Loss of power when running at high speed or under high load
- Piston breakdown
- Trouble other than with the engine