![]() And, will continue to increase, with additional miles of travel. ![]() The voltage required to fire the plug, has approximately doubled.Also, attributed to weak ignition voltage, an inoperative preheating system, or extremely low cylinder compression. ![]() Float level too high, defective needle or seat. Most often caused by an over rich, air fuel mixture.Ĭheck for a sticking choke, clogged air cleaner, or a carburetor problem. Soft, black, sooty deposits, easily identify this plug condition.If heavier deposits are allowed to accumulate, they can “mask” the spark, resulting in a plug misfire condition. A build up of combustion deposits, stemming primarily from, the burning of oil and or fuel additives.Also, lean air fuel mixtures, and insufficient octane rating of the gasoline. Prime causes include, ignition time advanced too far. The explosion that occurs in this situation, applies extreme pressures on internal engine components. This form of abnormal combustion has, fractured the insulator core nose of the plug.During hard acceleration, these materials shed from the piston or valves and are, thrown against the hot insulator surface. By products of combustion may loosen suddenly, when normal combustion temperatures are restored. And, often occurs after a long delayed tune up. Appears as “spotted” deposits on the firing tip of the insulator.Most often, if your spark plugs keep fouling out, you probably have an engine problem. Fluffy materials that accumulate on the side electrode, may melt to bridge the gap.Īnalyzing Your Spark Plug Color, Can Tell You More Than You Think. Consequently, causing a dead short and misfire. So, combustion deposits thrown loose, may lodge between the electrodes.Plug heat range is, too high for the engine or its operating conditions.Cross firing (electrical induction between spark plug wires).Usually one or a combination of several engine operating conditions, are the prime causes of pre-ignition.Instead, they melt to form a conductive coating, causing engine misfires to occur. As a result, normal combustion deposits, do not have an opportunity to “fluff off” as they normally do. This condition indicates that, spark plug temperatures have risen suddenly, during a hard, fast acceleration period. ![]()
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