The main symptoms of faulty spark plugs, causes, features of repair

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2018-03-25 15:22:15

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Spark plugs – it is an integral part of the engine of any diesel car. This detail provides the necessary spark that then ignites the mixture of air and fuel in the combustion chamber. Like all other parts of the engine, they can fail, and if there's any sign of symptoms of the spark plugs, needed to be addressed.

If the item is out of order, increases the load on the ignition coil, which also can break. The cost of the candles is incomparable with the coil price. If you continue to go on faulty candles, the driver will observe the unstable operation of the power unit at idling speed. Often, when everything is in good condition, the motor at about 1,000. smooth and soft. The failure of candles, the tachometer needle will bounce, and the motor vibrate and make unpleasant sounds hard. symptoms of spark plugsToday to detect signs of faulty spark plugs motorist will help ECU. A few decades ago, this has not happened, and those who self-serviced their cars, had to diagnose these items. In order to make a correct diagnosis, it is necessary to know typical problems with candles and be able to identify them visually.

What are the symptoms of faulty spark plugs?

So, when the spark fails, the motor is broken. The engine refuses to carry out its functions. Present a list of signs that required urgent intervention specialist. spark plugs and their symptomsIf the engine start is with a serious and visible difficulties, it is a signal to the owner about the need for diagnosis and replacement candles. Also about broken candles will tell the nature of the work of the motor: if the unit troit, twitching, and traction and power not, this is another sign. Along with this is often the failure of spark plugs in several times increases the fuel consumption and the composition of the exhaust gas is dominated by CO. If you are experiencing low power or the engine doesn't want to gain momentum when you press the accelerator, it also suggests the need of diagnostics.

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If the time to pay attention to these basic symptoms of the spark plugs, then the situation can be resolved. If you do not pay attention to these signals, the result will be disastrous.

The consequences of faulty candles

In the cylinders there is a detonation, which will result in a powerful shock wave. It can cause detonation of the charge that remains in the cylinder. After that, the motor will completely lose its power. In the process of this impact due to a serious overheating suffer the crankshaft, pistons and connecting rods. Also fade the little details and collapses the oil film on the cylinder.

When to change spark plugs

Every avtoproyzvodytely recommends that the planned replacement during maintenance. But experienced drivers do not agree with these statements. Most motorists do the plug replacement mileage – every 20-30 thousand km. symptoms of spark plugs VAZ 2114Candles Manufacturers recommend changing classic candle by 15 thousand. km. the Details of the platinum can be replaced as often – their life is 100 thousand km it is Not necessary to wait until the first signs of malfunction of spark plugs. If the tank is regularly filled with poor quality fuel, then spark will begin to accumulate carbon deposits and failure will be before the manufacturers of the time.

Diagnostics: looking for a candle with a defect

Problems can visually identify even with the naked eye. However, the failure is obvious when the car is running uneven and stalls. It is worth remembering that a malfunction of this kind make it impossible for the process of ignition of the fuel air spark in the cylinder.

Due To the fact that the fuel is not burned, it can reach the catalyst. This will be felt a strong smell of gasoline. Another obvious sign of a faulty spark – a significant increase in fuel consumption. This happens due to the fact that the mixture does not burn completely because of the misfiring.

For efficient combustion in gasoline engines need to have the temperature in the cylinders reached 400-500 degrees or more. This is possible through compression of the fuel mixture, which further increases the temperature. Just so the mixture easily, and most importantly - completely, will ignite and burn.

However, the high temperatures are not the best way affect the resource candles. Often the old parts are found layers. Also on the electrodes you can see the deposits, which have an impact on the quality of the spark. Remember that serviceable spark electrode has a uniform color and uniform shape, and any sediment do not exist.

Test plugs

Normal item has virtually no burn on the electrode. With this candle the motor will work like a clock. what could be faulty spark plugsIt is important to know what can be faulty spark plugs. This will help novice motorists.

Particulate plaque

If the grounding element and the electrode and the housing of the plug visible plaque, this candle worksfaulty. The reason is improper preparation of the mixture. For example, the composition may be too much air, or, conversely, not enough. Also, these deposits can appear as a result of contaminated air filters, problems with the injection system failure of temperature sensors or lambda probe.

Oil on spark plugs

In this case, the grounding element, the housing and the electrode is covered with a uniform oil coating. These symptoms of the spark plugs appear because of excessive amount of oil in the cylinders of the engine. This phenomenon is caused by the overflow of oil in the motor. In addition, this symptom may indicate worn piston rings, pistons, or valve guides. On cars with the turbo compressor of the candle in oil can speak about the problems in the operation of the compressor.

Varnish deposits

If the candle there are deposits of brown-yellow or green hue, the most popular reason – the presence of additives in gasoline or oil. These are symptoms of an engine to run too lean fuel mixture or gas.

Slag deposits

They can be observed in the earth element, and not the electrodes. These are large deposits of fuel and oil. The reason for this may be the presence of additives in the oil that are becoming more popular with manufacturers of lubricants. It can also be the cause of incorrect operation of the motor and the ignition system. It is often possible to observe such symptoms spark plug VAZ-2110.

Central electrode melted

You Can see the molten center electrode and the melted edge of the grounding element. Peugeot partner tepee spark plug symptomsThe Reason for this can be overheating of the candles in incorrect operation of the ignition system. These are signs of a faulty spark plug VAZ-2114. Such vehicles often seen problems with the ignition module.

The Electrode has worn out very quickly

On the electrodes and the grounding elements can be observed excessive wear, which resulted in the damaged material the critical elements of a candle. The reason-poor-quality gasoline with lots of additives. Also this may result in oil with additives. Rapid wear of the spark can be observed in the detonation or overheating.

Candle melted

Talking About this strong deposits on the grounding element and the electrode. This happens due to the presence in the chamber of combustion products of different deposits, which can spontaneously ignite. It can also be a symptom of improper operation of the valve. Well, the most popular reason – bad fuel.

Worn plug

Often the wear and tear of the candle is in a place where it creates a spark. However, damage can be and on the other hand – where is connected the high voltage wire. the main symptom of spark plugsThe Reason for this fault – the old plug on the wire or overheat.

Check spark plugs

Turns the candles off with a special key and listen to the motor work. If the engine does not break rhythm and continued to work steadily with normal sound, in the moment, pulled out the broken candle. You can also disconnect the wire from the candle and touch it to the engine block. If there is no spark, then a candle needs to be changed. what are the symptoms of spark plugsAlso on the faults may report an electronic control unit. Take, for example, the French car «Peugeot Partner Tepee”. The spark plugs symptoms which can be recognized not only by visual inspection, the owner can check with the ECU. As you can see, this is not so difficult. In fact, it is very important to know. Faulty spark – a wrong operation of the engine, damage to critical nodes and costly engine repair. And if you know how to operate the spark plugs and their symptoms, major problems with the motor can be avoided.


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Alin Trodden - author of the article, editor
"Hi, I'm Alin Trodden. I write texts, read books, and look for impressions. And I'm not bad at telling you about it. I am always happy to participate in interesting projects."

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