Can Spark Plugs Affect Engine Power?

1 Answers
Elliana
07/29/25 10:02pm
Spark plugs do have an impact on engine power. If a spark plug is damaged, it can directly lead to increased fuel consumption and decreased power output in a vehicle. Methods to determine if a spark plug is damaged: Remove the spark plug for observation. Assess its condition based on the following appearance characteristics: A normal spark plug's insulator skirt and electrodes should appear gray-white, gray-yellow, or light brown. A properly functioning spark plug will have a reddish-brown insulator skirt, with electrode gaps between 0.8-0.9mm and no signs of electrode burning. If the spark plug has oil stains or deposits but isn't damaged, it can continue to be used after cleaning off the oil and deposits. If the spark plug is severely damaged with signs like blistering at the tip, black streaks, cracks, or melted electrodes, the cause of damage should be identified. After troubleshooting, replace with a new spark plug. Additionally, if the spark plug appears smoke-blackened, it indicates incorrect heat range selection, rich fuel mixture, or oil leakage. Spark plug replacement procedure: Open the hood and remove the engine's plastic cover. Detach the high-voltage wires, marking each cylinder's position to avoid confusion. Use a spark plug socket to remove the spark plugs one by one. During removal, check for external debris like leaves or dust and ensure thorough cleaning. Place the new spark plug into the hole, hand-tighten it for several turns before using the socket wrench. Reinstall the high-voltage wires according to the firing order and reattach the cover.
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