It is the Mazda 3 Spark Plug that gives the engine the very first shot of fire that lights the air-fuel mix to get the car started and running in a smooth manner. The plug, which is located in the individual gasoline cylinders, is a high-voltage wire that passes the high voltage from the ignition coil across a small open circuit between the center and the side electrode, leaping this gap like a small bolt of lightning and sparking off the mixture dozens of times every second. It is secured by a threaded metal shell and is insulated by a ceramic shield preventing the electric path through the combustion chamber from the heat and pressure, which makes Mazda engines resistant to such conditions. With time, carbon deposits, heat erosion and general wear cause the spark to become dull and the vehicle will hesitate or burn up more fuel; hence, frequent replacement will keep the vehicle with crisp performance. Multi-ground or surface-discharge formulations, which redistribute workload, extend service life and resist fouling, have been applied occasionally in the life of the Mazda line; however, all were ignited by the same means. The correct heat range and setting the correct gap are important, as the gap being too small will cause the flame kernel to become weak, and a plug that becomes either too hot or too cold may melt electrodes or result in a misfire. Since fresh units are being selected by Mazda owners, they want to keep the specification in line with what has been written so they can make sure the 3 will continue firing without fail at each Spark Plug stroke. Even routine inspection, which is called reading the Spark Plug, provides hints concerning richness of the mixture or latent mechanical problems.
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