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How To Read Spark Plugs For Rich Or Lean. Most mechanics and diyers do not know you can tell when the engine is running hot or lean by reading the spark plugs. For gasoline fuels, porcelain color is a good indicator of a rich or lean mixture as well as tuning needs from air density changes.
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If an engine is too rich, the spark plugs will look black or glossy black, depending on how rich the engine is. How to read a spark plug. Most mechanics and diyers do not know you can tell when the engine is running hot or lean by reading the spark plugs. Are you unsure of how to interpret the color on the spark plug? The engine probably runs too rich. Looking at the ground strap and the tip of the porcelain insulator, you can quickly see the results of knock or timing adjustments before having to. You can use the burn color of your plugs and reference the plug color charts below to determine if your engine is running rich or lean. This can be caused by a dirty air filter, excessive driving at low speeds, too rich of a fuel/air mixture or idling your vehicle for too long. Here are some references to scour through: Web if you want to tune for max.
Are you unsure of how to interpret the color on the spark plug? That means nothing goes wrong, and your engine is operating well. Web 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. How to read a spark plug. Here’s some quick references to reading a motorcycle spark plug: To be safe, leave it at a full turn of light soot color. For gasoline fuels, porcelain color is a good indicator of a rich or lean mixture as well as tuning needs from air density changes. Dark coloring, such as heavy black wet or dry deposits, can indicate an overly rich condition, too cold a heat range spark plug, a possible vacuum leak, low compression, overly retarded timing or too. Web the spark plug is a great indicator, to see if the carburetor settings are correct. Usually, just by examining, the spark plugs. Are you unsure of how to interpret the color on the spark plug?
