Why did the VAZ-2106 spark plugs turn black and what to do?

During operation, the spark plug of any car is exposed to very high temperatures. In addition, the process of combustion of a mixture of fuel and air causes a chemical reaction, therefore, after intensive use, a coating appears on the working surface of the part, changing its color. A solution to the problem can be the use of candles made of materials that are resistant to both temperature and aggressive chemical influences. In addition, you can simply remove carbon deposits, returning the parts to their previous appearance and original performance.

Black carbon deposits on spark plugs, causes

Black carbon deposits on the electrodes and insulators are one of the most common spark plug problems.
Its appearance indicates certain problems in the operation of the car engine and its systems. In most cases, black soot is the remnants of an over-enriched fuel mixture that have not burned in the combustion chamber. Constant use of spark plugs with black soot leads to interruptions in their operation at best and complete failure at worst.

This is reflected in engine operation by the appearance of dips and jerks, unstable idling (the engine “troits”), “shooting” at the muffler, loss of power and throttle response, and increased fuel consumption.

There are not so many reasons for the appearance of black carbon deposits on the spark plugs of a carburetor engine of a passenger car (for example, VAZ 2108, 2109, 21099, 2105, 2107). Below is a list of them in relation specifically to carburetor engines of VAZ 2108, 2109, 21099, 2105, 2107.

Reasons for the appearance of black carbon deposits on the spark plugs of a carburetor engine

— Reasons related to the carburetor and power system

Black carbon deposits on spark plugs are the result of a highly enriched fuel mixture, the residues from incomplete combustion of which are deposited on the electrodes and insulator of the spark plugs. This can lead to:

Increased fuel level in the carburetor float chamber (“overflow”)

The level is not adjusted correctly, the needle shut-off valve is not sealed, the float(s) are not sealed, the float(s) touches the walls of the float chamber, the fuel pump creates excess pressure (the drive pusher protrudes strongly).

Measuring the fuel level in the float chamber of the carburetor 2108, 21081, 21083 Solex

Measuring the protrusion of the VAZ fuel pump pusher

Wear or leakage of the power mode economizer ball valve

Excess fuel enters the engine not only in power modes, when the economizer should be turned on, but also in all other modes.

Economizer device for power modes of carburetor 2108, 21081, 21083 Solex

Clogged air jets of the main dosing systems

The fuel mixture becomes over-rich because not enough air is supplied to it.

Air jets, fuel jets, emulsion tubes and GDS wells of the Solex carburetor

The fuel mixture “quality” screw is not adjusted correctly

The adjustment was made in the direction of re-enrichment of the fuel mixture.

Screws for adjusting the “quality” and “quantity” of the fuel mixture of the Solex carburetor

The air filter is very dirty

In this case, the balance of fuel and air again shifts towards an excess of fuel.

Heavily contaminated car engine air filter element

— Reasons related to the ignition system

The ignition timing is not set correctly

Most likely the ignition is too early. The fuel mixture ignites too early and does not burn completely.

Ignition alignment mark on flywheel

The high-voltage wires, the cover or the “slider” of the distributor are “broken”

Current leakage through “broken” parts of the ignition system reduces the power of the spark or leads to its termination. The fuel mixture does not burn efficiently.

Ignition coil is faulty

The ignition coil may leak current through a crack in the cover. The consequences are similar to those described above.

The spark plugs themselves are faulty

The glow number of the spark plugs does not correspond to the engine, the gap between the spark plug electrodes is small, the spark plug is internally defective.

The listed malfunctions lead to interruptions in spark formation, a weak spark between the electrodes of the spark plugs and, accordingly, to poor and inefficient combustion of the fuel mixture. As a result, the engine “troubles” or does not start, the electrodes of the spark plugs are black.

— Reasons related to engine malfunction

Severe wear on piston rings

Purpose of sparking devices

They are designed to create a spark, resulting in ignition of the working mixture in the cylinders of the VAZ-2107 engine. It is cylindrical in shape with contacts at the top and bottom. A current collector is connected at the top, and a spark is created at the bottom at a certain operating time. This time is determined by the ignition.

Black candles on the “seven”. Reasons for appearance

The color of the lower tip of the ignition devices characterizes the operation of the engine. Therefore, if you sometimes feel the engine tuning or poor starting, first of all you need to check the color on the electrodes. It is necessary to use a special key and visually determine the color of the electrodes. If solid black soot is visible, then this is evidence of malfunctioning engine operation. But why does blackness arise? This question plagues many drivers, but let’s try to figure it out together.

Blackness is the main evidence of soot deposition, the causes of which are:

1. The ignition is set to late, that is, combustion of the mixture in the cylinder occurs after the piston has reached top dead center and returns to the lower position. While it is known that the mixture must ignite before the piston approaches top dead center.
2. Enrichment of the fuel-air mixture. The devices are flooded with a fuel mixture, resulting in black carbon deposits. Carburetor adjustment is required.
3. Oil trapped in the cylinder. In most cases, it is a consequence of burnout of the piston rings, which requires a major overhaul of the engine. Oil scrapers rarely get damaged, through which oil gets in.
4. Early ignition may indicate soot deposits on the electrodes. The cause of the problem is corrected by setting the correct ignition.
5. The spark plugs do not meet the recommendations for this type of engine. It is necessary to purchase others, preferably Russian ones.
6. A lean mixture occurs when either a large amount of fuel or air is regulated by air suction. It is necessary to set the choke to the neutral position - if the engine is cold, and to the extreme recessed position - if the engine has heated up over 80 degrees. Let's look at this in more detail below.
7. The purchased devices are defective. Rarely does a marriage of all four occur, more often than not one. Eliminating the problem is purchasing new ones.
8. There is no “self-cleaning” of the device electrodes. Occurs in increased gaps between the electrodes. It is necessary to set the gaps; for carburetor engines it should be 0.8 mm.
9. Poor quality fuel. You cannot refuel with fuel with an octane number lower than that indicated in the VAZ-2107 technical passport. For carburetor engines of the “Seven”, you need to fill in A-92 gasoline. Impurities in the fuel settle on the electrodes and over time disrupt the spark-forming process, which leads to the appearance of soot.
10. Wear of spark-producing devices. This could be a distributor and spark plugs. Parts need to be replaced.

There are many reasons for the occurrence of soot and they all must be eliminated.

How to replace

Most drivers can remove and install spark generation devices with their eyes closed. But novice drivers often turn to the Internet with requests: how to remove spark plugs on a VAZ-2107? To do this, we describe the sequence of actions: 1) Open the hood, remove the terminals from all four devices. The terminals are removed by applying light physical force. 2) Taking a special key, unscrew it and perform a visual inspection. Determine the color of the contacts; black spark plugs need to be replaced. 3) You need to tighten it tightly, but do not overdo it. A weak tightening can lead to rupture of the device, and a strong tightening can lead to sticking to the cylinder head. As you can see, the sequence is very simple and will not lead to difficulties.

How does a carburetor affect spark plugs?

The same fuel-air mixture is supplied through the carburetor, which burns in the chamber. The carburetor has a damper, which is regulated by a choke lever installed in the passenger compartment of the VAZ-2107 car. Thanks to the correct position of the damper, the carburetor supplies the mixture to the combustion chamber.

It is important to clean the carburetor once every 30 thousand kilometers. Because small particles contained in the fuel settle on the walls of the carburetor, and subsequently this soot enters the combustion chamber, where black candles appear.

Now you know the main causes of soot. Most causes can be eliminated in the early stages of car operation, and some require replacement of devices or even engine repair. Happy renovation work!

Possible reasons for the appearance of soot

Before answering the question of why the candles are black, you need to decide how exactly they turned black . After all, it depends on which direction to search. In particular, the candles can turn black all together, or maybe only one or two of the set. Also, the candle may turn black only on one side, or perhaps along its entire diameter. There are also so-called “wet” and “dry” carbon deposits.

It should be noted that the speed of appearance and nature of carbon deposits directly depends on existing faults (if any):

• Carbon deposits on new spark plugs begin to form after at least 200-300 km. Moreover, it is advisable to drive along the highway at approximately the same speed and engine load. This way the spark plugs will work in optimal mode, and it will be possible to more objectively assess the condition of the car’s components.
• The amount and type of soot depends on the quality of the fuel used. Therefore, try to refuel at trusted gas stations, and not drive with gasoline or similar mixtures. Otherwise, it will be difficult to establish the real cause of the appearance of soot (if it occurs).
• In a carburetor engine, the idle speed must be set correctly.

Now let's move directly to the question of why black soot appears on the spark plugs. There may be 11 main reasons :

1. If you notice blackening on only one side, then most likely this is caused by a burnt-out valve. That is, carbon deposits on the spark plug fall on the side electrode from below (and not on the central one).
2. The cause of black spark plugs may be a burnt-out valve. The situation is similar to the previous one. Carbon deposits may penetrate the bottom electrode.
3. An incorrectly selected glow rating of a spark plug causes not only damage to it during further use, but also uneven blackening at first. If the mentioned number is small, then the shape of the soot cone will change. If it is large, then only the top of the cone will turn black, and the body will be white.

As a rule, when the ignition is set late and the air-fuel mixture is rich, the following consequences arise:

• misfires (error P0300 appears on injection engines);
• problems starting the engine;
• unstable engine operation, especially at idle, and as a result, increased vibration levels.

Next, we will tell you how to eliminate the listed faults and how to clean the spark plugs.

Formation of soot on the surface of SZ electrodes

White or light gray spark plugs in all cylinders are a sign of a lean air-fuel mixture supplied by the injector or carburetor. Moreover, the skirt, area near the electrodes and the threaded part are absolutely dry, without traces of oil.

Why is the fuel mixture supplied lean?

• lambda - the probe incorrectly informs the control unit about the amount of oxygen in the exhaust gases, the reason is sensor wear;
• faulty or clogged nozzles;
• incorrect carburetor settings or clogged fuel jets;
• insufficient pressure in the injector fuel rail;
• problems with the idle air control;
• air leakage under the manifold or in another place;
• unsuccessful chip tuning of the controller made by the owner of the car.

Car enthusiasts often ask the question: “Why are there black deposits on the spark plugs and soot of a different shade forms?” It's simple - spark plugs are used under conditions of aggressive thermal and chemical influences. In particular, when burned, the working mixture forms a grayish coating on the electrodes and this is a sign of the correct operation of all systems.

What to do if soot appears

First of all, it is necessary to remember that oil contamination and overheating, which results in soot on the spark plugs, are very harmful to the ignition system . Overheating is especially dangerous, since it causes the possibility of failure of the electrodes on the spark plugs without the possibility of their restoration.

If your car only has one blackened spark plug, you can diagnose the breakdown by simply swapping the spark plugs. If after this the new spark plug also turns black and the old one clears up, it means that the problem is not in the spark plugs, but in the cylinder. And if nothing has changed, then questions arise about the performance of the candle itself.

Oil deposits

In some cases, the candles may be wet and black. Most often, the reason for this fact is oil getting into the combustion chamber. Additional symptoms of this problem are as follows:

• difficulty starting the engine;
• omissions in the operation of the corresponding cylinder;
• the engine jerks during operation;
• the appearance of blue smoke from the exhaust.

Oil can enter the combustion chamber in two ways - from below or from above. In the first case, it enters through the piston rings. And this is a very bad sign, because it often threatens a major engine overhaul . In rare cases, you can get by with decoking the engine. If oil enters the combustion chamber through the top, it comes from the cylinder head along the valve guides. The reason for this is the wear of the valve stem seals. To eliminate this problem, you just need to select new, high-quality caps and replace them.

Carbon deposits on the insulator

In some cases, carbon deposits that naturally appear in the combustion chamber can come off the piston at high engine speeds and stick to the spark plug insulator. The consequence of this will be gaps in the operation of the corresponding cylinder. The engine will “trouble” in this case. This is the most harmless situation why spark plugs turn black. You can eliminate it simply by cleaning their surface or replacing it with new ones.

If black and red spark plugs , this means that you are pouring fuel with an excessive amount of metal additives. It cannot be used for a long time because over time, metal deposits form a conductive coating on the surface of the spark plug insulator. Sparking will deteriorate and the spark plug will soon fail.

Carburetor VAZ 2107, 2106, 2109, 2110

I would like to dwell in more detail on carburetor cars VAZ 2107, 2106, 2109, 2110, what you should pay attention to first if black spark plugs are found in them. First of all, pay attention to the “behavior” of the engine, whether it is running or not

If the spark plug is black and dry, then the fault lies in the fuel system, and if it is wet, then in the oil that has penetrated into the combustion chamber. The problem may also be in the ignition, which is set incorrectly

First of all, pay attention to the “behavior” of the engine, whether it is running or not. If the spark plug is black and dry, then the fault lies in the fuel system, and if it is wet, then in the oil that has penetrated into the combustion chamber

The problem may also be in the ignition, which is set incorrectly.

Pay attention to the carburetor, check:

• The second chamber - it must be dry;
• Is the mixture quality screw adjusted correctly?

You also need to check the condition of the spark plug itself, the high-pressure wire (may break through to ground), and the distributor. Don’t forget about the ignition coil; how to check it, read here https://autotopik.ru/sovet/997-kak-proverit-katushku-zazhiganiya-multimetrom.html.

If the engine does not start to stall immediately, but after warming up, then again go through the above points, plus, check the valve adjustment.

Cleaning spark plugs from deposits

Cleaning candles must be done regularly, as well as inspecting their condition. It is recommended to do this after approximately 8.10 thousand kilometers . It is very convenient to do this when changing the engine oil. However, if the symptoms described above occur, you can do this earlier.

it is not recommended to use the old method of using sandpaper to clean electrodes . The fact is that this creates a risk of damaging the protective layer on them. This is especially true for iridium spark plugs . Their central electrode is thin and coated with iridium, which is a semi-precious and rare metal.

To clean spark plugs you will need:

• detergent to remove plaque and rust;
• disposable plastic cups (after completion of the cleaning procedure they must be disposed of; they cannot be used for food products in the future);
• a thin brush with hard bristles or a toothbrush;
• rags.

The cleaning procedure is performed according to the following algorithm:

1. The cleaning agent is poured into a glass prepared in advance to a level that completely immerses the spark plug electrodes (without an insulator).
2. Immerse the candles in the glass and leave for 30-40 minutes (during the process, a chemical cleaning reaction occurs, which can be observed with the naked eye).
3. After the specified time has elapsed, the candles are taken out of the glass, and using a brush or toothbrush, plaque is removed from the surface of the candle, especially paying attention to the electrodes.
4. Wash the candles in warm running water, removing the chemical composition and dirt from their surface.
5. After washing, wipe the candles dry with a rag prepared in advance.
6. The final stage is to dry the candles on a radiator, in the oven (at a low temperature of +60...+70°C) or using a hairdryer or fan heater (the main thing is that the remaining water in them completely evaporates).

The procedure must be carried out carefully, cleaning and removing all dirt and plaque present on the surface. Remember that washed and cleaned candles are 10.15% more effective than dirty ones .

Results

The appearance of a black spark plug on a carburetor or injector can be caused by various reasons. As a rule, there are several of them at once . For example, incorrectly selected spark plugs, prolonged engine operation at high speeds, incorrectly set ignition, faulty valve stem seals, and so on. Therefore, we recommend that if the symptoms described above appear, you simply periodically check the condition of the spark plugs on your car.

This way you will not only extend the life of the engine, but also maintain power and driving comfort. You can see additional information on how you can diagnose a car engine by the color of spark plug soot.

Source

What color is considered normal?

The performance of the gasoline power unit is indicated by spark plug electrodes painted in a light brown tint, without oil deposits and soot. A similar picture is observed in completely new engines and engines that have undergone a major overhaul.

If the color of the working part differs from the specified one, it is advisable to carry out further diagnostics and identify the cause of the problem. Moreover, the engine itself is not always the culprit. What color options are there for spark electrodes:

• light gray or white;
• black;
• brick or frankly red tint.

In addition to all sorts of colors, the candle skirt is covered with various deposits - soot, brown soot, or may simply look wet. These phenomena are also considered signs of various malfunctions. It is proposed to consider each situation in more detail.

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Church candle: signs about why it can “cry”, fall, smoke and crack

When the candle "cries"

When and how to change spark plugs?

It is believed that a candle “cries” when wax actively rolls down it. This behavior cannot be ignored and here is what the signs say about this:

if the wax began to drain from the candle immediately after it was lit, then this indicates the influence of negative energy from the outside

It is also worth paying attention to the fact that at the moment the person who lit the candle has a very weakened energy background; The weakened energy is also indicated by influxes on the candle. In addition, such a candle indicates that the soul needs peace.

You need to try to protect yourself from unnecessary worries and not engage in self-criticism; if the wax from the candle drips slowly and one drop at a time, then this indicates the presence of a bad person in life. He can be a friend or relative, or just an acquaintance. This person wants to harm the person who lit the candle. You should be careful; a candle on which many influxes are formed, overlapping each other, speaks of an imminent illness. This is a warning from above that you will have to experience all the sorrows of long-term treatment and gain courage to fight the disease; if there are a lot of small sagging on the candle, which are located on one side, but everywhere, then this is an indication of problems in all areas of life. It is recommended not only to take care of your physical condition, but also to pay attention to the moral side of life. Perhaps it is worth reconsidering attitudes towards certain issues, people, and also engaging in spiritual transformation.

When the candle smokes

Candles that smoke with dark smoke can be found quite often. Some people are very frightened by this, and signs indicate the following about this behavior of the candle:

• A candle lit in a temple should not smoke, but if this happens, then this is an indication of the sinfulness of a person. Such people are advised to go to confession and repent, because if this is not done, then various troubles may arise in life;
• If a candle began to smoke in the house, lit on some religious holiday, it is necessary to cleanse the home of negative energy. Perhaps she just gathered in the house due to constant quarrels, or perhaps people with weak energy live in the house;
• when soot occurs as a result of a ritual or prayer, one should speak of the imposed negative. This can be either severe damage or a slight evil eye. In any case, the negative must be removed.

When the candle falls

It is no secret that a candle is placed with the molten tip down, and it is attached to the surface with wax as it hardens, but it also happens that candles fall. Some people immediately begin to panic and say various bad things to themselves. There are many different signs about falling candles and this is what they say:

For unmarried women and girls, a candle falling in a temple promises positive changes in their personal lives. She says that the lady will soon get married; a candle falling in a church for everyone else indicates serious conflicts in the near future

It is necessary to communicate with family and friends with caution. If this is not done, then a quarrel is possible, for which there will be no reconciliation for a long time

It is also recommended to take a closer look at your soul mates. Sometimes a fallen candle signals betrayal; If a candle falls at home, then you should prepare for serious health-related challenges. Perhaps in the near future a serious illness will be discovered in the person who lit the candle.

When the candle cracks

Candle cracking is also a common phenomenon. This behavior of the candle does not mean anything terrible, but the signs indicate the following:

• if the candle begins to crackle immediately after it is lit, then you should expect unpleasant guests. They will be unexpected and bring bad news;
• a candle that does not crackle immediately notifies the homeowners that there is a lot of negativity in the house. It is recommended to invite a clergyman to the house for a cleansing ceremony and go to church for repentance;
• but a crackling sound, similar to hissing, speaks of imminent disappointment. They can relate to any area: work, relationships, everyday life, hobbies, etc. It is recommended to take them calmly and not try to change the situation.

Choice

The choice of candles today is quite extensive. But we’ll talk about which ones are used for the VAZ 2110 and what can currently be considered the best choice for your car.

Candles differ from each other mainly in the material from which the electrodes are made.

The service life may increase or decrease depending on the care, conditions of use of the vehicle, and the quality of the fuel being poured.

Platinum candle

Flushing with removal from the engine and complete disassembly

Here we need the same tools and tools.

The order of work is as follows:

1. We carry out the work provided for in paragraphs 1–12 from the previous chapter.
2. Disconnect the air and throttle valve drive cables from the carburetor.
3. Using a 13mm wrench, unscrew the nuts (4 pcs) securing the device to the engine.
4. We disconnect the heating block from it by unscrewing the screw with a Phillips screwdriver.
5. We unscrew the fuel quantity adjustment screw by hand.
6. We do not remove the throttle valves.
7. Using a slotted screwdriver, unscrew the fuel quality adjustment screw.
8. Soak the carburetor body in kerosene (gasoline, acetone). After this, we clean it with a toothbrush.

Video: cleaning the Solex carburetor

After assembling the carburetor and installing it on the engine, it is necessary to adjust it.

Significant wear and depressurization of valve floats

In simple terms, this fuel begins to flow in large quantities into the internal combustion engine of the internal combustion engine in normal and powerful modes.

Clogged air filter

It may also cause darkening of the spark plugs.
It needs to be checked and, if anything, replaced with a new one. Ignition system: the ignition angle is incorrectly set, the insulation of the wires is damaged, the integrity of the cover and the thrombler slider is damaged, then the ignition coil is not working properly and in the end it’s all about the spark plugs themselves.

All of the above reasons can lead to inconsistent sparking, in which case not only gasoline combustion occurs, but also coal-black soot appears on the spark plugs.

Burnt out valves (ICE)

Very often, valves burn out or the gaps are not adjusted correctly.
This also results in carbon deposits on the spark plugs.

A black spark plug corresponds to a reduced compression ratio in the cylinder.