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 images below, courtesy of NGK Spark Plugs, and get ready to do a little light reading the next time you pull your spark plugs.. Normal. 18 Good. Heat Range: (click for larger image) Heat Range = Ground Strap, the ground strap indicates the heat-range of the spark plug. 23 Hot or Lean But OK (?) Often caused by worn valve guides, excessive use of upper cylinder lubricant, or idling for long periods. 1 Oil Fouled. 12 Good. greenish color. 6 Cold or Rich But OK. 7 Cold or Rich But OK. 8 Cold or Rich But OK. 9 Good. 21 Kinda Hot But OK. 22 Hot or Lean But OK (?) Normal spark plug Black is the color of oil fouling. Heavy deposits . Caused by rich running. However, it is nice to know the most important tell-tale signs to look for on spark plugs. 20 Good. Spark Plug Chart for Reference: Here is a spark plug chart showing all the different ways to “read” spark plugs. Spark plug construction. Dry, black, soot-like deposits. 2 Oil Fouled. Note the brown to greyish tan color, and minimal amount of electrode erosion which clearly indicates the plug is in the correct heat range and has been operating in a "healthy" engine. Spark plug super clean? Red is a sign of iron particle s or rust in the fuel system. ... the spark plug will be unable to properly self-clean by burning off carbon deposits. Remedy: Replace with new spark plugs. 4 Too Cold. Cause: Lead additives in fuel. Follow these instructions on how to remove a spark plug. This guide was designed to assist the technician, hobbyist, or race mechanic in understanding, using, and troubleshooting spark plugs. 15 Best. Head gasket leak causing coolant to steam clean the plug. Pay more attention to the size of the deposits and where they occur to determine if there is a problem. Spark Plugs . Spark plug heat range and color chart NORMAL Combustion deposits are slight and not heavy enough to cause any detri***** effect on engine performance. Numerous questions have surfaced over the years, leaving many people confused. 3 Carbon Fouled. Lead fouling Insulator nose covered in places with thick brown/yellow glazing, which can have a greenish color. Take the spark plug in your hand and begin looking at it for signs of damage. 14 The Best. A build-up of heavy, light-grey sandy deposits. A yellowish color is typically caused by leaded gas. 5 Too Cold. Below we share the spark plug reading chart: Normal Condition An engine’s condition can be judged by the appearance of the spark plug’s firing end.If the firing end of a spark plug is brown or light gray,the condition can be judged to be good and the spark plug is functioning optimally. You will likely see one of the following conditions. Spark plugs are one of the most misunderstood components of an engine. 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