Dry, black, soot-like deposits. 6 Cold or Rich But OK. 7 Cold or Rich But OK. 8 Cold or Rich But OK. 9 Good. greenish color. 14 The Best. Heavy deposits . This is more of an old-school mechanic test. A yellowish color is typically caused by leaded gas. Plugs are ideally suited to engine, engine probably in good condition. 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. 17 Best. Pay more attention to the size of the deposits and where they occur to determine if there is a problem. Spark plug super clean? 2 Oil Fouled. 5 Too Cold. 19 Good. Spark Plug Colours and Engine Problem Guide Download this sheet as a PDF file here. 20 Good. Spark plug construction. Black is the color of oil fouling. Glazing results from high engine loading after extended part-load operation. 13 Real Good. Follow these instructions on how to remove a spark plug. 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. Head gasket leak causing coolant to steam clean the plug. 10 Good. This guide was designed to assist the technician, hobbyist, or race mechanic in understanding, using, and troubleshooting spark plugs. Often caused by worn valve guides, excessive use of upper cylinder lubricant, or idling for long periods. Spark Plugs . However, it is nice to know the most important tell-tale signs to look for on spark plugs. A build-up of heavy, light-grey sandy deposits. 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. Effects: At high loads, the glazing becomes conductive and causes misfiring. The first step is removing the spark plug you want to look at. 11 Good. 4 Too Cold. Spark Plug Chart for Reference: Here is a spark plug chart showing all the different ways to “read” spark plugs. Look at end of the spark plug that was in the cylinder and examine it. You will likely see one of the following conditions. 3 Carbon Fouled. 18 Good. Remedy: Replace with new spark plugs. Normal spark plug ... the spark plug will be unable to properly self-clean by burning off carbon deposits. A spark plug is an electrical device that fits into the cylinder head of some internal combustion engines and ignites compressed petrol by means of an electric spark. Spark plugs are one of the most misunderstood components of an engine. 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