The Main Cause of Black Car Spark Plugs

The Main Cause of Black Car Spark Plugs – As an important component in gasoline engines, spark plugs can also be used as an indicator of how the performance and performance of the engine happened before. The term can be used to diagnose the condition of the engine. The trick is to pay attention to the color around the spark plug head (the end with the electrode). Through the color display on the spark plug head, we can find out the condition of the engine in the car. Is this engine working normally, experiencing overheating (too hot), or even wasteful of fuel.

The Main Cause of Black Car Spark Plugs

The Main Cause of Black Car Spark Plugs
The Main Cause of Black Car Spark Plugs.

As we know, the spark plug head is located in the combustion chamber along with the valve. The color that appears on the spark plug head is a reflection of the combustion effect that occurs in the combustion chamber. Engines with normal combustion conditions are characterized by an even grayish brown color around the spark plug head. In addition, the condition of the spark plug head will also look clean and there will be no visible build-up of scale or deposits of combustion residues.

Read more: 6 Symptoms Must Change Spark Plugs in Cars

Meanwhile, for overheating conditions, the entire surface of the spark plug head is marked with a dominant yellow and white color, even in some conditions, the tip of the electrode is eroded so that the spark plug gap becomes larger.

How about a jet black car spark plug color? The color of the black car spark plug indicates the combustion conditions in the engine are very problematic. Generally occurs due to the fuel mixture that is too rich (a lot), and the occurrence of oil leakage so that the oil enters and burns in the combustion chamber.

The amount of fuel that is too much will make the combustion incomplete, leaving a dark black soot in the combustion chamber. Even so with the oil that enters the combustion chamber, it will be difficult to burn and will even stick to the entire wall of the combustion chamber.

So, what are the causes of jet black car spark plugs? see information on the causes of black car spark plugs below.

1. Dirty and Clogged Air Filter

The Main Cause of Black Car Spark Plugs
Dirty and Clogged Air Filter. Image source: Mechanic Base

The first cause of black car spark plugs is the result of a dirty and clogged air filter. The air filter is an important component to filter dirt and dust before entering the combustion chamber.

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If dust and dirt are allowed to accumulate for a long time, both of them will form lumps that settle on the filter surface, there is even some dust and dirt that is sucked into the intake so that it often becomes a barrier for air to enter the intake. In the end, the air filter will be completely clogged so that only a small amount of clean air can enter the combustion chamber.

A clogged air filter will directly affect engine performance. Usually the engine becomes powerless and the fuel becomes more wasteful. In addition, the amount of fuel that is too much also often causes incomplete combustion. In effect, the results of combustion often leave enough black soot to make the spark plugs of the car turn black dry.

2. Abnormal Injector Spray

The next cause of dry black car spark plugs is due to abnormal injector spray. Usually this happens when the injector spray is not in the form of a mist, but rather like a fountain.

Read more: Symptoms of Injector Damage on Common Rail Diesel

This fountain-like injector spray (not in the form of a mist) makes the fuel more difficult to burn compared to fuel that is already in the form of a mist. As a result, soot will appear and stick to the head of the spark plug. This is what can eventually cause jet black car spark plugs

Generally, this abnormal spray injector often occurs due to dirty fuel. It could be because the fuel filter has never been cleaned or replaced, the fuel tank has never been drained, or it uses unclean fuel.

3. Weak Ignition Coil

The Main Cause of Black Car Spark Plugs
Image source: Reddit

A weak ignition coil (example: increased coil resistance) will affect the amount of sparks that appear at the spark plug. Keep in mind that the air and fuel mixture is compressed by the piston, the compression pressure will affect the results of the sparks that appear on the spark plug head.

Read more: VSV Causes Ignition OFF Engine Still Turning

When the ignition coil is weak, the spark on the spark plug will also change and shrink. In effect, the ability of spark plugs to ignite the fuel mixture at the right time is reduced. This will result in incomplete combustion so that soot will appear which is the cause of jet black car spark plugs.

4. Ignition Timing Too Slow

Ignition timing is the time when the spark plug sparks just before piston compression reaches TDC (Top Dead Point). For some injection cars produced before 2012, the ignition timing still needs to be adjusted periodically. Usually done using a tool called Timing light.

Read more: Throttle Position Sensor; Function and How it Works

Along with the use of the vehicle, the ignition timing often shifts (due to a loose adjustment nut or the spark plug head is too worn) so that it can affect the combustion process that occurs in the combustion chamber.

Ignition timing that is too slow causes the combustion process to be incomplete and often produces soot in the remaining combustion products. This soot is what often makes car spark plugs black.

5. Using the Wrong Type of Spark Plug

The Main Cause of Black Car Spark Plugs
Using the Wrong Type of Spark Plug. Image source: Gridoto

The next thing that can cause jet black car spark plugs is the use of the wrong type of spark plug. As is known, car spark plugs are divided into 2, hot spark plugs and cold spark plugs.

Read more: 6 Signs of Car Spark Plugs Must Be Replaced

The use of inappropriate spark plugs will cause the ceramic cleaning process on the spark plug (which usually occurs by itself due to the temperature in the combustion chamber) to be not optimal.

As a result, the crust that should be wasted by the hot temperature in the engine continues to stick to the spark plug head. This causes the spark to be disturbed, combustion is not complete until as a result black soot appears on the spark plug head.

6. Oil Leaking Valve Seal

The next cause of black car spark plugs is the result of an oil leak in the valve seal. Oil leaks in the valve seal will make oil enter the combustion chamber through the valve stem and fall into the combustion chamber.

Read more: Valve Seal Marks Must Change

The entry of oil into the new chamber will certainly result in incomplete combustion, even the air-fuel mixture will be mixed with chemicals in the engine oil. As a result, incomplete combustion and car spark plugs become black and even wet with engine oil. Not infrequently the exhaust smoke produced will be very thick.

7. Oil Ring Wear

The last thing that ombro knows can be the cause of jet black car spark plugs is that the oil ring on the piston is worn out. As is known, there are 3 rings on a car piston so that compression can be maximized, namely the compression ring, rinse ring and oil ring.

When the oil ring is worn, the engine oil attached to the cylinder wall will also enter the combustion chamber and catch fire even though it is not completely burned. As a result, the spark plug of the car is black and there is oil around it.

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