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