How is the new spark plug blackened?

The new spark plug will burn black, probably because the spark plug gap is too large; There is no high pressure fire or the ignition time is too late, which will affect the incomplete combustion of fuel and cause black carbon deposition; Overinjection or dripping of oil from the injector may lead to a rich mixture, and may also make the spark plug black. Too rich mixture will affect insufficient combustion and easily lead to carbon deposition. Carbon impurities will adhere to the top of the spark plug, further affecting the work of the spark plug. Of course, it is necessary to check the problem immediately, remove the carbon deposit and solve the problem of blackening the spark plug.

Too rich mixture is mostly caused by engine sensor failure, and the information fed back to the computer is wrong, which makes the fuel injection adjusted by the computer too rich, resulting in incomplete combustion and carbon deposition. Engine sensors refer to water temperature sensors, oxygen sensors, intake pressure sensors, throttle position sensors, air flow meters, etc.

When the owner installs the spark plug himself, he should pay attention to choosing the appropriate spark plug, including the material of the spark plug, the calorific value of the spark plug and so on.

The calorific value of the spark plug is the same as that of the original car. The increase or decrease of calorific value will basically have a certain impact on the rotation of the engine. For example, if the calorific value becomes smaller, there may be phenomena such as insufficient combustion of oil-gas mixture, insufficient power, and even excessive temperature of spark plug due to insufficient heat dissipation, which may lead to deflagration.

If the calorific value of spark plug is increased, the heat dissipation capacity will be stronger, the temperature of spark plug will drop faster, and the ignition head will easily accumulate carbon, which will lead to power failure and make the spark plug unable to ignite.

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