2016 Mercedes-Benz AMG GT S Used Cars in Charlotte, NC 28212. Avg. Dealer Rating: (5 reviews) They have been so great, answered all of my questions and very patient with me when I wasn't immediately responsive due to illness. They worked everything out for an out-of-state sale.
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.
You have probably wondered what the letter-number combinations on the NGK spark plugs and their packages mean. The combination of letters and numbers assigned for every NGK spark plug is not only the type designation, it is a logical formula which contains the important details for the function of the spark plug. (PDF, 73 KB)