How to Replace a Faulty Spark Plug?

1 Answers
LincolnDella
07/30/25 6:07am
To replace a faulty spark plug, follow these steps: 1. Wait for the engine to cool completely, open the hood, unplug the high-voltage pack connector, and remove the fixing bolts; 2. Use a socket wrench to loosen the nuts by turning counterclockwise; 3. Use a magnetic rod to extract the spark plug; 4. Attach the new spark plug to the magnetic rod and insert it into the hole; 5. Reassemble by following the above steps in reverse order; 6. Start the engine to check if the spark plug is functioning properly. The reasons for a faulty spark plug include: 1. Insufficient spark energy during ignition; 2. Excessive air-fuel ratio in the fuel mixture; 3. Overheating of the engine; 4. Dirty air filter; 5. Excessive idle speed; 6. Severe carbon buildup and use of low-quality gasoline; 7. Damaged valve oil seal or crankcase ventilation valve.
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