Spark plugs occupy a central place in the functioning of the engine. They are responsible for high-quality combustion of fuel. Replacement of spark plugs on a Priora 16 valve must be carried out at an interval of 30 thousand kilometers. If the part is coated with iridium or platinum, installation can be carried out after 60 thousand km. You can perform the steps to change the unit at a service station, as well as independently. The procedure is simple, even novice drivers with little experience can handle it.
It is necessary to replace the spark plugs on the Priora earlier than the specified period if the following symptoms appear:
- The engine does not start well.
- Fuel overconsumption is observed.
- Loss of dynamism.
- The motor is tripping.
This list is not complete, since it is possible to analyze the condition of the part only after its dismantling. Below we will describe in detail how to replace spark plugs on a Lada 16 cl, and also tell you about acceptable options for replacement.
Consequences
Driving a Priora with faulty spark plugs is fraught with failure of other internal combustion engine components. Operating the vehicle with a non-functioning spark plug can lead to failure of the catalyst or oxygen sensor. The cost of these parts is quite high compared to a set of spark plugs.
Clogged catalyst VAZ 2170-72
You can read which spark plugs to choose for your car here.
What does carbon deposits on spark plugs indicate?
The first picture shows a working candle with a little soot. A slight deposit on the insulator and electrodes, the reason for this may be poorly functioning PVN (armored wires), a rich mixture or an ignition delay
The second picture shows a candle with a brownish-yellow soot; sometimes there are candles with a glossy insulator, as if polished. The reason for this may be the use of fuel with a high octane number that is not suitable for the car.
If overheated, the spark plug will have a white insulator with small black deposits and premature electrode erosion. The reason for this may be ignition advance, or a spark plug that is not fully wrapped.
If the spark plug electrode is melted or partially deformed, this indicates premature ignition. This leads to a loss of engine power, as well as rapid wear.
How to choose the right new spare parts for a car?
Many drivers and owners of Lada “Priora” know that a 16 cl engine differs from an 8 valve one. A distinctive feature lies in the parameters, namely the diameter of the threaded zone. On an engine with sixteen valves, the diameter is smaller. Despite this factor, replacing spark plugs on a Prior 16 valve or other modification is no different.
Suitable spark plugs for such an engine from a national manufacturer are marked:
- A17DVRM for warm months;
- A15DVRM for the winter period.
The reduced heat number on the marking helps to quickly start the engine at negative air temperatures. If desired, it is possible to purchase imported analogues, for example:
- GNR, Bosch (WR7DC) or Beru (14R-7DU);
- UK, Champion (RN9YC);
- Czech Republic, Brisk (LR15YC).
Symptoms of a problem
One of the most common signs of faulty spark plugs is the failure of one of the cylinders, that is, the engine begins to stall and run unstably. Vibrations and dips appear, the car’s dynamics disappear, its starting deteriorates, fuel consumption increases and the “CheckEngine” lamp lights up.
All these signs are associated with spark plugs; if such symptoms appear on your car, it is immediately recommended to replace the spark plugs.
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.
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:
- Open the hood and remove the plastic protective cover from the engine;
- We remove the power wire from the ignition coils and unscrew the bolts that secure them;
- We pry up the coils with a flat screwdriver and take them out;
- 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;
- 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;
- 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:
- Remove the power wire from the shank;
- Unscrew using a 21 mm socket wrench;
- 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!
Varieties of candles
Spark plugs are divided into multi-electrode and two-electrode. For multi-electrode spark plugs, one is located in the middle and the rest are located at the edges. It is believed that such spark plugs last longer than two-electrode spark plugs. They have only two electrodes - one in the center, the other on the side. Spark plugs are also divided into regular, iridium or platinum.
Iridium spark plugs for Priora
Another characteristic of candles is their potassium number. The heat number is the average pressure at which it is easier to heat candles during testing. So, they are distinguished by types: cold (heat number above 20), medium (17-20), universal type (11-20), hot (11-14).
Replacement
The process of replacing spark plugs is a very simple task that does not require special training; you just need to prepare the necessary tool.
Tool
- A driver or ratchet with an extension (you can use a special wrench for spark plugs);
- Long head “16 mm” or “21 mm” (depending on the number of valves 16kl-16mm, 8kl-21mm);
- TORX E8 head or 10mm socket (depending on the year of manufacture of the car, new models use TORX sprockets);
Process
- We remove the decorative trim of the engine with the inscription “16 valve”, it is attached to rubber clamps; to dismantle it, you need to pull it up from each corner.
- Using an E8 or “10mm” head, unscrew the IKZ and remove them.
- Using a ratchet with an extension and a 16mm socket, unscrew the spark plugs; to remove the spark plug from the cylinder head well, you can use a coil.
- We install new spark plugs; it is advisable to tighten the spark plugs without a wrench. This is necessary in order to feel the effort; if the spark plug is skewed, you will not ruin the thread in the head.
- New spark plugs must be tightened 180° after they stop.
- We assemble everything in the reverse order and start the engine.
Replacing spark plugs on an 8-valve engine is simpler and easier; you just need to remove the high-voltage wires and unscrew the spark plugs with a 21mm socket.
Source
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- Disconnect the ignition coil terminal.
- Unscrew the coil mounting bolt.
- Using a flat screwdriver, remove the ignition coil.
- The spark plug is located in a recess (spark plug well); an extension cord is needed to remove it.
What happens if you make the wrong choice?
If you install unsuitable or low-quality spark plugs in your car, the following troubles may arise:
- deterioration of engine ignition. When starting the engine, the owner will have to crank the starter for a long time, and this can reduce the functionality of the battery. In some situations it will be impossible to start the vehicle;
- excess fuel consumption;
- Once started, the engine will be much noisier and the sounds will subsequently increase in volume. This is especially noticeable during the process of warming up the car;
- the production of harmful substances in exhaust gases will increase. The analysis can be carried out using special equipment;
- the power and dynamics of the motor will decrease. This will be noticeably felt as you climb the hill.
In order to avoid such problems with your car, we recommend buying only high-quality spark plugs from trusted manufacturers.
In this article, we discussed how to change spark plugs and the principles of choosing the right part for the full functioning of the power unit. It is necessary to pay due attention to the choice of spark plugs, since they play a major role in the operating system of vehicles.
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Mechanism of action
Replacing spark plugs on a 16-valve Priora is carried out on a cold, not warmed-up engine, according to the following step-by-step instructions:
- The plastic motor protection is removed. To do this, you will need to unscrew the filler cap where the engine oil is poured. Additionally, on the left side (in the top corner), you need to remove the plastic latch. After removing the protective housing, we recommend returning the oil filler cap to its place. This will prevent external elements such as dust, dirt and foreign particles from getting inside the container.
- Be sure to disconnect the terminals from the ignition units.
- Screws intended for coil fixation are unscrewed. Depending on the types of fasteners used in the Priora 16 valves, you may need a star-shaped wrench or a head with a number ten.
- To remove the coil, you need to pry it using a flat-tip screwdriver;
Unscrewing the spark plug on a Priora
- The candles are unscrewed. To do this, use a spark plug wrench with an extension. After performing these actions, you should visually evaluate the functionality of the part. By appearance, the car owner is able to determine how correctly the engine is working.
At the next stage, the spark plugs on the Prior 16 are replaced or the base part is returned, provided that it is fully functioning. Next, it is important to return the coil to its place, screw in the fixing screw and place the terminal.
In the process of twisting the candle, do not apply much effort; the part is placed with ease. If over-tightened, the thread may be damaged, and this will lead to a complete and expensive repair of the cylinder head (cylinder head).
Similar actions are carried out with the remaining ignition elements. After the procedure is completed, the plastic cover on the motor is returned to its place.
