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By examining the spark plugâs insulator color, even a less-than-mechanically-inclined person can determine valuable information about the engineâs overall operating condition. Normal: Grey to Light Golden-Brown Color. This condition is ideal, the spark plug and engine air/fuel mixture are operating properly.
To understand how spark plugs work, we will begin with our source. Spark plugs require a certain amount of voltage and current in order to produce the ignition spark. This source is generally in the source of the battery.Next, we adjust the output of the battery through something called an ignition coil to meet the spark plugâs demand.o understand how spark plugs work, we will begin with our source. Spark plugs require a certain amount of voltage and current in order to produce the ignition spark. This source is generally in the source of the battery.