The new spark plug burned black.

The new spark plug burns black, and the root cause may be that the spark plug gap is too large; There is no time to put out the fire or strike the fire, and the evening program causes incomplete combustion of gasoline and diesel, resulting in gray-black carbon deposition; Too many fuel pumps or fuel injectors leak oil, which will lead to too rich mixture and promote the blackening of spark plugs. Too rich mixture will cause insufficient combustion, which is very easy to cause carbon deposition. Carbon residue will adhere to the top of spark plug, further endangering the work of spark plug. Therefore, it is necessary to check the problem immediately, eliminate carbon deposit and deal with the problem of spark plug blackening.

Too rich mixture is a common problem of automobile engine sensors, and the information fed back to the computer is incorrect, which leads to too rich ignition advance angle controlled by the computer, resulting in incomplete combustion and carbon deposition. Automobile engine sensors generally refer to water temperature sensors, oxygen sensors, intake liquid level sensors, electronic throttle phase sensors and air flow meters.

Car buyers should pay special attention to the selection of suitable spark plugs, including spark plug materials, spark plug calorific value and so on.

It is best to use spark plugs with the same calorific value as the original factory. Increasing or decreasing the calorific value will cause certain harm to the operation of automobile engines. For example, if the calorific value is reduced, it is likely that the mixture will not burn fully, the driving force will be insufficient, and even the spark plug will be too high due to insufficient heat removal, which will further lead to an explosion.

If the calorific value of the spark plug is increased, the heat removal capacity will be stronger, and the temperature of the spark plug will drop rapidly, which is easy to cause carbon deposition on the top of the ignition head, leading to power failure and preventing the spark plug from sparking.