Zone of fouling with soft deposits - vehicle engine run at idling speed or its low load can result in the setting of soft (dry) combustion deposits on the insulator tip, even if the fuel does not burn in liquid state. Cold starts and frequent moving off from rest in cold weather will accelerate the fouling of the insulator tip. The decreasing insulation resistance of the insulator tip results in an occasional failure of ignition. In addition, the insulator tip is wet from the non-evaporated fuel. Level of creation of combustion deposits is significant. Diffusion (atomization) of fuel is low and the fuel burns in its liquid state. The mixing ratio of fuel and air is very low in this case (rich mixture). Zone of fouling with non-evaporated fuel - this is the zone of the highest degree of fouling for spark plugs.
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