What should be the gap on the spark plugs of a 16 valve VAZ-2112

According to the official technical regulations of AvtoVAZ, spark plugs on Lada Priora cars (VAZ 2170, 2171, 2172) are replaced every 30 thousand km. It is for this mileage that the life of the spark plugs is designed.

However, some drivers neglect the factory recommendations and change spark plugs less often, as a result of which engine wear increases. In the article we will look at this issue in more detail, we will tell you which spark plugs to choose and how to change them.

What should be the gap on the spark plugs of a 16 valve VAZ-2112

Almost every motorist has come across the concept of adjusting spark plug gaps. Repeatedly this problem has become the cause of many troubles. Basically, malfunctions are associated with improper combustion of fuel in the cylinders, and the car may stall and consume too much fuel.

The video material will tell you what the gap should be on the spark plugs of a VAZ-2112 16 valves, and will also tell you about replacing spark plugs

What a gap there must be!

Diagram of valve clearance measurement

The spark plug gap is the distance between the electrodes that are connected to produce a spark. Since the 16-valve VAZ-2112 is only an injection system, we will talk about the gap specifically for this injection system.

Gap size between spark plug electrodes

So, the normal gap on spark plugs is the distance between the electrodes, which is 1.00 - 1.13 mm . Exactly, going beyond these limits can cause a large number of problems, such as:

1. Change in consumption (comparison with factory data).
2. Floating speed.
3. The car starts to shake.
4. Oil in spark plug wells.
5. And others.

How to measure and correct spark plug gap

The gap between the spark plugs can be checked using a special feeler gauge, which has a corresponding plate thickness marking. It should fit a little tight, but not too much. If the probe does not fit through or the gap is too far from ideal, then it is necessary to press the metal part (upper) of the electrode against the graphite one. After this, take measurements again and so on until it is perfect.

Flat probe for measuring and changing the gap between spark plug electrodes

Of course, stores usually sell spark plugs with the gap adjusted from the factory. But, long transportation can lead to the distance between the electrodes being broken, so before installation, it is necessary to adjust the spark plug gap on all spark plugs when replacing them.

A clear example of measuring the spark plug gap using a feeler gauge

Consequences of incorrect clearance

As experience and practice show, untimely valve adjustment can lead to the following consequences:

• A small gap will mean that the engine will not be able to develop sufficient power , and will also stall or have difficulty starting.
• A large gap leads to greater fuel consumption . Of course, more fuel means better dynamics and traction. But, in the modern world, when everyone is struggling to save money, a consumption of 12-15 liters per 100 km will not please the owner. The second nuance is gas failures or too large jerks, which are sometimes unnecessary, especially for operation in the urban cycle.

The correct gap on the spark plugs ensures correct operation of the engine as a whole and its individual elements, such as: gas distribution mechanism, fuel combustion process, consumption and others. Adjusting the clearance on a 16-valve VAZ-2112 engine is quite easy and simple with your own hands.

Installation

1. We tighten the new spark plug exactly according to the thread, without using a wrench (“by hand”). After all, damage to the threads in the engine head will lead to new costs. And only at the final stage do we “press” the candle using a wrench.
2. We install the high-voltage coil in place (with slight pressure). We put a terminal on it.

Now you can start replacing the next candle.

After 15 thousand kilometers, it is recommended to re-inspect the condition of the spark plugs. Sometimes brownish-yellow carbon deposits can be observed on the surface of the electrodes. This indicates the use of fuel with an octane rating that is not suitable for the vehicle. When the spark plug overheats, the carbon deposits will turn white. Erosion is also possible. The reason may be early ignition timing. Sometimes the candle is simply not screwed on tightly. Also, with early ignition, the electrode itself melts. This spark plug is for replacement only. Which spark plugs are better for Priora 16 cl., see above.

If the car is moving, you should check the part with a tester for functionality. Typically, a gun with a metal tip and cap is used for this. The tip is touched to the thread of the spark plug, and the cap is placed on the terminal for the armor wires. When you pull the trigger, a spark should occur between the electrodes. If it is not there, the element needs to be replaced.

So, we found out which spark plugs are better for Priora 16 cl. choose and how to replace them. During the work, it is advisable to check the spark plug well for the presence of oil. If it is there, the cylinder head gasket may have burned out in the engine. As for the question of choice, many advise taking factory spark plugs. They work no worse than their analogues, and their cost is acceptable for buyers. Spark plugs with a resistor performed well - breakdowns in them were reduced to zero.

Life hack: spark plugs for Priora - fault diagnosis, replacement, price

When buying spark plugs for a Priora with a 16-valve engine, they usually create a reserve for themselves so that they can install a new one immediately after one of them becomes faulty. If you manage to start the car with one faulty spark plug, then failure of the remaining parts will result in the car refusing to start. In general, let’s immediately dispel the myth that 8-valve engines require some other spark plugs for a Priora car. In 16th grade, like in 8th grade, the same is given. Changing the spark plugs on a Priora is easy; in this article we will tell you how to do it, but that's all: The price of components for a Lada Priora car is not high - so I advise you to change them more often. To avoid more serious repairs. Because, having acquired carbon deposits from bad fuel, this will affect the engine by friction. Priora, like other cars, requires attention. Replacing oils and components.

Thinking about which spark plugs are best to install on a Priora, many refuse to believe in the miraculous power of analogues, installing only standard parts in their car, because the manufacturer swears that they will not harm the car. But every time a car owner sees the painfully familiar color of soot, he prepares to replace the ignition elements. I will say the following - on a Priora, a lot depends on gasoline and even driving style. It will be healthier to refuel at a good gas station, but that’s not all. You need to drive the car not only sluggishly, but sometimes give it a normal load. Moreover, it is better to do this periodically.

There is nothing difficult about changing the spark plugs in Priora yourself. This is a routine operation that is comparable to replacing headlight bulbs. It is recommended to check the gap between the electrodes from time to time. It is better to look for spark plugs for Priora in advance. When purchasing a set of elements for a Lada Priora car with 16 valves, try to compose it from the same models - so that there are no differences “in the row”.

When do you need to change spark plugs?

The replacement interval of 30 thousand km is very arbitrary. The AvtoVAZ company equips Priora engines with domestically produced single-electrode spark plugs marked A17DVRM for a 16-valve unit and AU17DVRM for an 8-valve unit. Practice shows that even on a new car, these spark plugs often fail long before the end of the service interval, causing unstable engine operation and increased fuel consumption. For this reason, many car enthusiasts prefer imported products.

Fault diagnosis

The best way to determine performance is to test the spark plug under pressure. The essence of this diagnostic method is to check sparking on the electrodes under conditions close to operating conditions. To do this, a candle is screwed into a special chamber equipped with an inspection window, and a discharge is passed through it, while air is pumped into the chamber with a compressor or manually.

At a certain moment, the discharge on the electrodes will begin to fade, and then completely disappear. Record the pressure gauge readings at this moment and compare them with the pressure in the cylinder, which was previously measured with a compression gauge. Plus 2 atm should be added to the compression meter readings. since the starter speed is much less than the engine operating speed. If the pressure in the cylinder is higher than the spark attenuation pressure at the electrode, the spark plug should be changed, because in operating mode it does not ensure complete combustion of fuel, and its excess begins to enter the engine oil sump.

Basic faults

The time has come to explain why it is worth carrying a certain supply of candles with you for the Priora. Don’t even store them in the garage or at home, but put them under the trunk lid so you don’t have to worry about anything when a critical situation occurs. When the “spark” doesn’t go after a hard day at work, you definitely won’t be eager to walk to the nearest auto parts store.

You can determine the malfunction of the Priora spark plugs by the following signs:

• Starting the engine is difficult (that is, the starter rotates, the fuel-air mixture is supplied inside the chamber, but there is still no spark; the engine will start if you turn the starter for a long time).
• Fuel consumption has increased (there may be several reasons for this phenomenon, but if at least one more reason from the list appears, it is worth inspecting the ignition unit).
• The proportion of carbon monoxide coming out of the exhaust system has increased.
• The engine power has decreased (this is especially noticeable during acceleration - there is no usual “traction” and good acceleration).
• The engine is misfiring, which means one of the cylinders is not working - simply because “its” spark plug did not give a spark, the mixture did not ignite.
• Usually the spark plug is changed every 15,000 km (for many this is one year of driving with their favorite car), but they can be “flooded”. This is a more serious problem that will take a little longer to deal with.

Manufacturers and prices of analogues

It is not always possible to find a standard set of spark plugs for the VAZ-2170 in the nearest stores. Therefore, you can install four new parts, in accordance with the number of cylinders under the hood. The choice of elements, thanks to other manufacturers, has become more diverse:

• Bosch (manufactured in: Russia) au17dvrm. Price – about 250 rubles per set;
• Denso (Japan) w20epr. Price – 140 rubles per piece;
• Brisk (Czech Republic) lr15yc. Four pieces – 300 rubles;
• NGK (Japan) bcpr6es. One piece – 150 rubles;
• NGK (Japan) bcpr6es price per unit – 200 rubles;
• Bosch (Germany) fr7dcu. One piece – 100 rubles;
• Lecar Kit – 230-250 rubles;
• Valeo 246871. One piece – 170-180 rubles;
• Beru (Germany) 14R-7DU. One piece – 140-150 rubles;
• Champion (England) RN9YC. One piece – 230-250 rubles.

Replacing spark plugs for a Lada Priora car with 16 valves

To replace spark plugs on a Lada Priora car, prepare a special socket wrench with a “10” head.

Priora is a car sensitive to the gap in the spark plug, this can affect fuel consumption and traction. For 16 cl motors, a gap of 1 cm is measured by the factory. It is important to check the gap between the electrodes before installation.

This is usually checked with a round probe that looks like a coin. Of the Russian coins, only 10 kopecks more or less fit this role - their thickness is 1.25 mm. This gap will increase as the engine runs.

Remove the negative voltage from the battery, and then put the car on the handbrake so that nothing interferes with the work. Replacing spark plugs on a Priora is done in 5 steps, see them below:

1. remove the plastic casing;
2. unclip the wire block clamp, disconnect them from the ignition coil;
3. remove the coil mounting bolt, then pry it off with a flat screwdriver and remove it;
4. there is a candle in the well - this is what is needed now. Remove it using an extension cord.
5. put a new part in place of the old one.

Types of spark plugs: iridium and regular

The first iridium spark plugs for cars were produced by Denso. Today they claim that such parts, unlike conventional ones, have a longer service life. We installed such parts on the Priora, but did not notice the difference - perhaps this is just a marketing ploy. We don’t think that the Priora is anything special and there will be a noticeable difference on other cars. But still in terms of technology: durability is due to the gas-tight insulation of the central electrode, aluminum oxide insulators, reduced loss of electric current, a high degree of insulation, and a large volume of the ignition zone.

Denso even produces special models for AvtoVAZ. The electrodes are coated with a lubricant mixture, which increases their gas impermeability, while the temperature in the ignition unit remains optimal - premature or late ignition is excluded. The side electrode is designed in such a way that it allows ignition to be optimized; in this case, even a lean mixture will be ignited.

You can install iridium spark plugs on the Lada Priora, the advantage of which is clear - they need to be changed much less often. But the service life of these elements will be significantly lower than that declared by the manufacturer. The fault lies not in the malfunction of the car - the quality of gasoline leaves much to be desired.

As mentioned earlier, iridium spark plugs can even light a lean mixture. When they work with a contaminated mixture (and the risk of running into unscrupulous filling remains high), they suffer even more. This is comparable to the work of the lungs of a person who lives in a non-ecological area: not only does fumes settle everywhere, the wear and tear of the “organs” accelerates.

Valve replacement of ignition elements for Lada Priora 16 valves is real. Manufacturers producing analogues for this VAZ car produce similar copies from iridium. But don’t rush to rejoice: even if you are promised that the spark plugs will last about one hundred thousand kilometers, on Russian roads this is unlikely to be true.

However, take care to ensure that the cylinder head gasket is always completely sealed against leaking oil. If oil gets on your iridium spark plugs, your expensive purchase will be rendered useless.

Classification

You need to approach your choice as responsibly as possible. It is worth deciding which type of spark plug is best suited for the car.

• Number of electrodes: two- and multi-electrode. The first type consists of several elements. These are the side and central electrodes. These are installed standard on Priora. As for the second type, they have one central and three side electrodes. As reviews note, these candles have a longer service life and are more reliable.
• Type of material. Often spark plugs are equipped with copper electrodes. What are the best spark plugs for Priora? Judging by the reviews, they have a short resource - up to 30 thousand kilometers. But recently more “tenacious” iridium analogues have appeared on the market. Their resource is about 60 thousand. By the way, such candles have a slightly smaller diameter of the central electrode. If on copper it is 2.5 millimeters, then on iridium it is 0.7 millimeters.
• Thread diameter. When purchasing, check with the seller for which engine you need spark plugs. Thus, 16-valve valves are equipped with elements with a smaller head size and thread diameter. Spark plugs from an 8-valve engine simply won’t work in a 16v Priora.
• Heat number. This parameter means the pressure at which it is easier to heat the candle. There is a cold and a hot type. The glow number of these candles is 20 and higher for the first and 11-14 for the second. Which spark plugs are better for Priora 16 cl.? There is no clear answer to this question. But there are also universal options. In this case, the glow number is from 11 to 20. These are the spark plugs that many motorists use. They behave well both in summer and in cold weather.

WHAT IS THE RISK OF AN INCORRECT CHOICE OF CANDLES?

Correctly selected spark plugs for Priora are an essential condition for normal engine operation. The choice of spark plugs depends on what engine is installed in your car. 8 and 16-valve power units require this device with a different heating range. The heating range is the amount of thermal energy that the spark plug is capable of conducting into the combustion chamber of the fuel mixture.

Using a spark plug with an inappropriate heating range can cause problems and engine malfunctions. For example, using an excessively “warm” one causes it to overheat and not have time to cool down to the required temperature during the operating cycle of the engine. When a new portion of fuel enters the cylinder block, premature ignition of gasoline may occur due to the high temperature of the spark plug, as a result of which the operation of the power unit will be disrupted.

Excessively “cold” igniters of the fuel mixture, operating in a temperature range of up to 400 degrees, on the contrary, are at risk of completely losing their functional properties due to the soot of burnt fuel formed on their electrodes.

Checking the condition of the spark plugs

Based on the condition of the spark plug electrodes and threaded part, you can determine whether the engine is operating optimally.
If the top of the spark plug insulator heat cone is light gray to gray in color, then the engine cylinder is operating normally and the fuel injection system is adjusted. If the top of the heat cone of the spark plug insulator is white, then the ignition timing is incorrect.

Black, soot-like deposits indicate that the spark plug is not reaching its self-cleaning temperature (frequent short-distance driving), incorrect heat rating, too high carbon monoxide content.

Oily layer on the electrodes. Damaged piston rings, valve guides or oil seals. You may have used oil or fuel with additives. In this case, you need to change the oil or fuel with additives and check the condition of the spark plugs again.

WHAT IS THE DIFFERENCE IN CANDLES FOR 8 AND 16 VALVE PRIORS?

As mentioned above, Priors with 8 and 16 valve engines require different spark plugs. According to the recommendations of Auto-VAZ, spark plugs for 16 valve Priora must comply with the A17DVRM standard, and for 16v engines - AU17DVRM.

In fact, the differences between them lie solely in the design features - devices labeled A17 are designed for a standard hexagon, AU17 - for a smaller one.

You can see the features of marking of domestically produced products in the image.

Features of marking spark plugs of domestic production

Manufacturer's recommendations

It is unlikely that anyone will doubt which spark plugs the manufacturer will recommend for a Russian car? Naturally, domestic production. And this is natural - not always European, let’s say, refined quality can work effectively with our equipment. And so, spark plugs for Priora 16 valves must be marked - AU17DVRM. For an 8-valve engine – A17DVRM. A15DVRM are best suited for winter driving, as they are characterized by a low heat rating and, accordingly, will be easier to ignite in cold conditions.

Spark plug markings

However, many motorists choose foreign-made spark plugs for their Priora cars. Thus, the German companies BOSCH (WR7DC, FR7DCU), BERU (14R-7DU, 14FR-7DU) are very popular. The English company CHAMPION (RN9YC, RC9YC) is not far behind them. Automotive stores also have Czech ones, for example BRISK (LR15YC, DR15YC). These are high-quality, reliable spare parts, which, however, are no better or worse than domestic ones. Just a little more expensive.

SELECTING THE BEST COPY

Let's figure out which spark plugs to put on the Priora 16 valves. Many drivers agree that these ignition elements are consumables, for which there is no point in overpaying, since they will still wear out after 20-30 thousand kilometers. If you have a similar opinion, the domestically produced AU17DVRM is your choice. They are not expensive and work, in principle, quite well.

When choosing among products from foreign manufacturers, we recommend giving preference to the following companies:

• Beru (standard 14FR-7DU);
• NGK (BCPR6ES);
• Denso (Q20PR-U11);
• Bosch (FR7DCU);
• BRISK (DR15YC).

The best spark plugs for a 16 valve engine, according to Prior owners, are made by the Japanese company Denso. Their iridium spark plugs on the Priora - Denso Iridium Power - have proven themselves well, and can travel for about 50-60 thousand km without any problems.

In general, the presence of an iridium electrode significantly increases the durability of the structure; moreover, iridium models retain their original characteristics throughout their entire service life.

For clarity, we present a graph of the increase in fuel consumption as different electrodes wear out.

Graph of increase in fuel consumption as different spark plug electrodes wear (iridium and conventional)

We’ve figured out which spark plugs are best for 16-valve Priora engines – let’s move on to 8-valve engines. The situation is similar for manufacturers: the best budget option is A17DVRM from our ZAZS plant.

Let us draw your attention to the fact that domestic A17DVRMs are an order of magnitude more durable and reliable than nameless Chinese ones at the same cost, so there is no need to be led by beautiful names and bright packaging.

Versions of high-quality foreign models tested by Prior owners - NGK BPR6ES and DENSO W20EPR - they are not cheap, but they are worth their price in full.

The Bosch FR7DPX Platinum also performed well. Reviews from prior drivers indicate that with them the car drives differently - the vibration in the engine disappears and the speed picks up better, and there are no problems with ignition even in severe frost.

Description of types and markings

When the need for replacement arises, you should decide which candles are best to install. The most popular brands are Brisk, NGK and Bosh. However, they have different markings adopted in Europe, so you need to know which imported candles correspond to the domestic markings. The interpretation of this marking, according to OST 37.003 081 - 98, is as follows:

1. The first letter A means the type, diameter and thread pitch - M 14 x 1.25.
2. If the letter U follows, it indicates the size of the hexagon for tightening the spark plug, 16 mm. In the absence of the second letter, the product has a size of 20.8 mm.
3. The number 17 shows the heat number. When the engine is running, the spark plug heats up to a certain optimal temperature, at which it self-cleanses. In the event of unfavorable operating conditions, overheating of the electrodes occurs, and the fuel in the cylinder can ignite spontaneously, without waiting for a spark to occur. This effect is called glow ignition, and the glow number of a candle is a parameter indicating the temperature regime of its proper operation. The higher this parameter, the less the product heats up (cold candle) and can work in much more difficult conditions than a candle with a low heat rating (hot). In engines with high power and high speeds, colder spark plugs are used, and for power units with lower loads, hot products are used.

Marking of imported spark plugs on Lada Priora

1. The letter D indicates the length of the thread (skirt) - 19 mm.
2. The letter B means that part of the insulator protrudes above the plane of the product body.
3. The letter P indicates that a resistor is built into the spark plug body to suppress interference from sparking.
4. The last letter M indicates that the central electrode is bimetallic with a copper core.

The question of how to choose imported spark plugs by size for a Priora is not difficult to solve. To do this, just unscrew the old spark plug and have it with you during purchase. How imported products are labeled is shown in Table 1.

As can be seen from the table, the markings of domestic and imported candles are different. In addition, there are other markings. To simplify the selection process, Table 2 shows the corresponding spark plugs from various manufacturers for installation on Priora.

Manufacturer, brand	"Gran-LTD", "Alice-EZ"	NGK	Bosch	Brisk	CHAMPION	Beru
Marking	A17DVRM, AU17DVRM	BCPR6ES-9, BPR6ES-9	FR7DCU, WR7DC	DR15YC, LR15YC	RC9YC, RN9YC	14FR-7DU, 14R-7DU

Note: in Table 2, the markings in the numerator are for the 16-valve Priora engine, and in the denominator for the 8-valve engine.

It is better to purchase spark plugs from official dealers, whose representatives will be able to explain all the nuances on the spot and advise on the appropriate option, since there are high-tech products at a higher price. For example, platinum or iridium spark plugs, the central electrode of which is made of these metals.

Its diameter is only 0.4-0.7 mm, despite the fact that a standard copper electrode has a size of 2.5 mm. Such products last twice as long as regular ones, so their high cost is fully justified. Spark plugs with two, three and four side electrodes are also suitable for installation on Priora. It is believed that they create better conditions for fuel combustion and extend the life of the vehicle's power plant.

REPLACEMENT PROCEDURE

Any murzilka (operation book) for VAZ cars states that spark plugs must be replaced every 30 thousand km. mileage However, in practice, even the highest quality products rarely travel 30,000 km.

The first sign that a replacement needs to be made is a change in the normal functioning of the engine. You will notice changes in its idle speed, and there will also be problems with ignition.

Unscrew them and visually inspect the electrodes. In normal condition, the electrodes are light gray in color, with a minimal amount of brown deposits allowed. During operation, the electrodes become covered with a yellow or brown coating (this is a normal condition for the middle of their service life). When the ignition elements of the fuel mixture become obsolete, black metal deposits appear on the insulator, and the electrode burns out or melts.

It is also necessary to pay attention to the spark plug gap between the insulator and the electrode (ideally for Priora it should be 1.1 mm, which is indicated in the service book). The gap increases during operation, so if a check shows that the gap is 2-3 millimeters larger than it was originally, the spark plug needs to be replaced.

The gap can be adjusted by simply bending or pressing the electrode against the insulator, but this can only be done normally on new spark plugs; when worn, the electrode, as a rule, becomes very fragile and crumbles under rough influence.

In the image below you can see the stages of spark plug wear.

Stages of spark plug wear

If the electrode is intact, you can try to revive the product; to do this, you need to anneal the deposit on the electrode with a gas burner and, after it has softened, remove it with a metal brush. This must be done carefully so as not to damage the fragile structure.

Now let’s figure out how to replace spark plugs on a 16 valve Priora. To do this you will need a spark plug wrench, a screwdriver and a 10mm socket wrench to unscrew the coils.

Everything is done according to the following algorithm:

1. Open the hood and remove the plastic protective cover from the engine;
2. We remove the power wire from the ignition coils and unscrew the bolts that secure them;
3. We pry up the coils with a flat screwdriver and take them out;
4. We take a special key and unscrew the spark plugs. This may not be so easy to do, since high temperatures may cause the shrink thread to stick to the body of the part. Unscrew it carefully so as not to damage the structure, since removing fragments of insulator from the well is an extremely problematic task. If you have a compressor at hand, blow out the shrinkage well to remove dust and contaminants accumulated in it;
5. We check the condition. If it is damaged or extremely worn, we install a new one. We insert the spark plug into the magnetic head of the key and screw it back in. There is no need to make any effort here - the thread should go smoothly, and after the body is held tightly in the seat, you need to tighten the thread with light force;
6. All that remains is to install the coils in place and connect power to them.

Replacing spark plugs on an 8-valve Priora differs from the procedure described above due to their location. In 16-valve engines they are recessed into a well inside the cylinder block, while on 8-valve engines the spark plugs are placed on the surface of the block, so changing them is much easier.

Replacement is carried out as follows:

1. Remove the power wire from the shank;
2. Unscrew using a 21 mm socket wrench;
3. Screw in new ones and connect power.

Now you know which spark plugs are best for Priora and how to replace them. Have a good ride without any breakdowns!

DIY replacement instructions

Now we’ll tell you how to change the SZ on a Lada Priora car yourself and what may be required for this. To replace, you need a spark plug wrench; you can find it at any car store. If there is no key, then you can use a 16-gauge spark plug head. It is advisable that the spark plug key be equipped with a magnet or rubber band inside, this will allow you to fix the unscrewed spark plug in the device.

The replacement is done like this:

1. First, turn off the ignition, open the hood and reset the battery terminal just in case.
2. The Priora engine is protected by a plastic casing; it will need to be dismantled. When dismantling, be careful, as there is a possibility of damaging the fastenings - they are quite weak.
3. After this, you will need to disconnect the terminal from the ignition coil and unscrew the bolt that secures it in the seat. Using a flat-blade screwdriver, you will need to pry up the coil and remove it from the installation location; this must be done in order to ensure more convenient removal of the spark plugs. You must also pry the coil with a screwdriver carefully so as not to damage the device.
4. As for the spark plugs themselves, they are all located in wells. A high-voltage cable is connected to the spark plug; it should be disconnected before dismantling. Removing the SZ without an extension cord will be impossible, so in any case you will have to use it to remove it. After dismantling, inspect the well itself - if there are traces of oil in it, this indicates that the cylinder head is functioning intermittently. Sometimes this problem is associated with a breakdown of the cylinder head gasket, in which case it will have to be replaced. If you are changing the spark plug for the first time in a new car, then you will have to make some efforts to remove it, and not every spark plug wrench will be able to withstand it. If you have problems unscrewing the SZ, then use a head with a wrench or a more powerful screwdriver.
5. If you have a compressor, then it is better to blow out the spark plug well to remove dirt, but before that, the area around the well should be thoroughly cleaned of dirt. Dirt should not be allowed to get inside, as this will destabilize the operation of the motor.
6. Remove the SZ from the seat. If there are any difficulties during removal, then put the previously removed coil on the SZ - it will allow it to cling to the device. Assess the condition of the spark plug tip - when there is carbon or traces of deposits on it, this may indicate improper engine operation. There can be many reasons for this - ranging from incorrect formation of the air-fuel ratio during the formation of a combustible mixture and ending with the use of low-quality gasoline. The procedure for removing the coil, disconnecting the wires and unscrewing the SZ is repeated for all spark plugs.
7. If there is no carbon deposits, then most likely the engine is working correctly, then you can start installing new spark plugs. Install the new spark plug into the seat; first, tighten the spark plug without applying much effort and without a key. This is very important, because if you install the SZ incorrectly, then when you force it, there is a chance of ruining the thread. Moreover, this way you will ruin not only the spark plug, but also the well in the cylinder head, as a result of which you will have to remove the engine and bore the threads. When the SZ is completely screwed in, you need to tighten it using a key.
8. Reinstall the ignition coil and connect the high-voltage wire. Tighten the bolt that secures the coil, then start the engine and check how it works. If everything was done correctly, then replace the motor protective casing.

Photo gallery “Changing SZ with our own hands”

Which spark plugs for Lada cars are best to choose?

A malfunction of the spark plugs immediately affects the operation of the engine; it begins to stall, jerk, does not pull, or starts poorly. To solve the problem, simply replace them with new ones, but which spark plugs are better to choose?

All modern 8 and 16 valve power units have the same manufacturer's recommendation. In other words, advice on choosing spark plugs will be similar for all modern Lada cars.

In the user manual for Lada Priora, Kalina, Granta, Vesta Largus, Niva and XRAY cars, the engine technical specifications contain the following data:

VAZ 11183, VAZ 11186/11189

VAZ 21126, VAZ 21127

Granta, Kalina, Largus, Vesta

Granta, Kalina, Priora

The gap between the spark plug electrodes should be within 1.1.15 mm. Let us remind you that Lada Vesta and Lada XRAY can be equipped with a Nissan-Renault HR16/H4M engine. The spark plug gap in this case should be 0.85...0.95 mm. For K4M/K7M engines (more about spark plugs), the gap between the spark plug electrodes is 0.95+-0.05.

According to the requirements, the manufacturer must guarantee uninterrupted operation of the spark plugs for 18 months, provided that the vehicle mileage does not exceed 20,000 km. However, with good technical condition of the engine and proper operation, the service life of the spark plugs can be significantly longer. Thus, spark plugs are often replaced every 3 years or after 40 thousand km.

Marketers suggest improving engine performance by installing, for example, iridium, platinum or multi-electrode spark plugs on the Priora, the price of which is higher than usual. AvtoVAZ recommends using conventional, single-electrode spark plugs for its engines. In a review by ZaRulem magazine, a survey was conducted that shows that the majority of drivers follow the factory’s recommendations and choose simple, inexpensive spark plugs.

As part of the same review, nine different spark plugs were tested. As a result, they all passed the tests, and the winner was determined by summing up the points:

So what spark plugs should I put on Priora/Granta/Kalina/Vesta? Based on the recommendations of AvtoVAZ, the test results of a popular car magazine and a survey of the social network VKontakte, we can conclude that the best choice would be spark plugs from manufacturers: NGK, Bosch, Denso, Brisk and EZ Standard.

What kind of spark plugs do you use? What is the main factor when choosing them? Let us remind you that a high-quality battery also affects engine starting.