In general, a light tan/gray color tells you that the spark plug is operating at optimum temperature and that the engine is in good condition.

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Take the spark plug in your hand and begin looking at it for signs of damage. Look at end of the spark plug that was in the cylinder and examine it. You will likely see one of the following conditions. A …

Having functioning spark plugs is essential to a working engine. After all, a bad spark plug can make your engine run roughly, perform sluggishly, misfire, or stall. If you have a faulty spark plug, your …

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Apr 29, 2016 · With help from the spark plug experts at NGK, we’ll teach you how to diagnose minor tuning issues or potentially major engine problems by examining your spark plugs. Check out the …

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Jul 13, 2025 · In this guide, we will explain how to read spark plugs, what different spark plug appearances mean, and how you can use this information to maintain the engine in top condition.