Can spark plugs with different thread lengths be used?

[StGraham]

Spark plugs with different thread lengths cannot be used because mismatched models and varying discharge gaps can cause issues such as engine shaking, difficulty in acceleration, and increased fuel consumption. Steps for replacing spark plugs: Open the hood, lift the engine's plastic cover, remove the high-voltage distributor wires, and mark each cylinder's position to avoid confusion. Use a spark plug socket to remove the spark plugs one by one. While removing them, check for external debris like leaves or dust and ensure thorough cleaning. Place the new spark plug into the spark plug hole, hand-tighten it a few turns, and then use the socket to tighten it further. Reinstall the removed high-voltage distributor wires according to the firing order and reattach the cover. Damaged spark plugs can directly lead to issues like ignition system leakage, increased fuel consumption, reduced power, and most importantly, difficulty in starting the engine, affecting normal vehicle operation. Severe spark plug erosion—such as scarring at the top, broken or melted electrodes—indicates that the spark plug is damaged and should be replaced.