greenish color. 14 The Best. 23 Hot or Lean But OK (?) 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. 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. Carbon fouling . Effects: At high loads, the glazing becomes conductive and causes misfiring. This is more of an old-school mechanic test. Pay more attention to the size of the deposits and where they occur to determine if there is a problem. Glazing results from high engine loading after extended part-load operation. Black is the color of oil fouling. 17 Best. 4 Too Cold. Remedy: Replace with new spark plugs. A yellowish color is typically caused by leaded gas. Lead fouling Insulator nose covered in places with thick brown/yellow glazing, which can have a greenish color. Heavy deposits . Spark Plug Colours and Engine Problem Guide Download this sheet as a PDF file here. You will likely see one of the following conditions. 2 Oil Fouled. This guide was designed to assist the technician, hobbyist, or race mechanic in understanding, using, and troubleshooting 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. 21 Kinda Hot But OK. 22 Hot or Lean But OK (?) 13 Real Good. Head gasket leak causing coolant to steam clean the plug. Dry, black, soot-like deposits. A build-up of heavy, light-grey sandy deposits. Caused by rich running. 6 Cold or Rich But OK. 7 Cold or Rich But OK. 8 Cold or Rich But OK. 9 Good. 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. 12 Good. 3 Carbon Fouled. 16 Best. Spark Plugs . Heat Range: (click for larger image) Heat Range = Ground Strap, the ground strap indicates the heat-range of the spark plug. Spark plug super clean? ... the spark plug will be unable to properly self-clean by burning off carbon deposits. Spark Plug Chart for Reference: Here is a spark plug chart showing all the different ways to “read” spark plugs. Red is a sign of iron particle s or rust in the fuel system. 19 Good. 1 Oil Fouled. Plugs are ideally suited to engine, engine probably in good condition. 5 Too Cold. Often caused by worn valve guides, excessive use of upper cylinder lubricant, or idling for long periods. 20 Good. Spark plug construction. 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