The car does not gain momentum when the gas is fully pressed. Why is the engine not picking up speed? Possible causes and methods for their elimination. Piston group wear

When operating a car with a gasoline or diesel engine, a situation sometimes arises when the expected increase in speed does not occur when the accelerator pedal is pressed. serviceable power unit must respond immediately to an increase combustible mixture in the combustion chambers by increasing the speed crankshaft, but if this does not happen, you need to look for a malfunction. Its cause can be both fairly simple and easily fixed things, and serious breakdowns.

The main reasons for the lack of engine dynamics

The driver, who constantly operates the car, easily determines the deterioration dynamic characteristics motor, which manifests itself in sluggish acceleration, bad traction, increased fuel and oil consumption. These processes are often accompanied by the appearance of a bluish or black exhaust. Most often, this is due to the following reasons:

Insufficient heating of the power unit.
Poor quality of fuel used.
blockage air filter and problems with the air supply system.
Malfunctions of the gas distribution mechanism.
Malfunctions of fuel supply systems.
Sensor failure.
Ignition system malfunctions.
Weak compression in the cylinders.
Incorrect operation of the car ECU.
Specific malfunctions of engines with a turbocharger or carburetor.

Cold engine

The dynamic characteristics of the power unit will not reach its maximum until working temperature the coolant will not rise to a value of 90 ° C. A cold engine is unable to quickly develop speed, for this the air-fuel mixture in the combustion chamber must be warmed up. Otherwise, the engine will stall, twitch and detonate.

Fuel quality

Usage quality gasoline or diesel fuel - a guarantee of long-term engine life and obtaining maximum power performance from it. But none of the drivers is completely immune from refueling with low-quality fuel, the use of which threatens not only with a significant decrease in power performance, but also with the inability to start the engine. The regular use of low-quality gasoline is manifested in the intense formation of carbon deposits on the cylinders, pistons, catalyst and in the exhaust manifold, as well as in increased cylinder wear. piston group.

Filter clogging

An excessively clogged air filter reduces the amount of air that can pass through it into the combustion chambers, causing the engine to lose power and become rough. A similar consequence causes a lack of fuel supply to the combustion chambers when the fuel pump malfunctions or it is difficult to pass it through the line or through fuel filters for various reasons.

Violation of the gas distribution mechanism

Breakdowns or incorrect adjustment of the gas distribution mechanism shifts the gas distribution phases from the optimal point, and causes a sharp decrease in engine power. This is due to the incomplete release of the cylinders from exhaust gases, or insufficient filling with air or air-fuel mixture. Jumping the chain or timing belt by one or more teeth causes a disruption in the operation and adjustment of the mechanism that provides the necessary ignition timing depending on the engine speed. A significant drop in power is also observed when the timing valves are incorrectly adjusted, when they are insufficiently opened or not completely closed.

Fuel system malfunctions

In the event of a power failure gasoline engine loss of power is felt first. These include contamination fuel filters, interruptions in the operation of the fuel pump, power supply to the injectors and depressurization of the fuel line, due to which the engine feels a lack of fuel. The most common problems with diesel engines fuel equipment- this is the wear of the injectors and the fuel pump, depressurization of the fuel line, freezing of the fuel in fuel line and clogged filters.

Sensor malfunctions

IN modern engines to achieve a combination of high dynamics and low fuel consumption, readings from various sensors are used that determine the position of the crankshaft, air consumption, detonation in the combustion chamber, exhaust gas composition, position of air and throttle valves, and external temperature. Data from them enters the engine ECU, and affects the mode of its operation. A malfunction of one or another sensor makes the operation of the power unit not optimal, which manifests itself in a loss of power.

Ignition system malfunctions

Most often, in the ignition system, problems that reduce engine power relate to candles, in which the gaps between the electrodes may be broken, carbon deposits have been deposited on them, or the insulator is damaged. The deterioration of the quality of the spark or its absence is often the result of a break, broken contacts or integrity high voltage wires, ignition coils and distributor.

Piston group wear

At long-term operation engine, natural wear of the piston group occurs, which causes a drop in the necessary compression in the cylinders and the power of the power unit. Excessive wear can occur when the piston rings lie due to improper engine operation, the use of poor quality fuel and oil.

ECU malfunctions

Management of all processes of a modern car is carried out by the electronic unit, which collects sensor readings, and, based on the program embedded in it, regulates the operation of the engine. The operation of the ECU can be changed by setting different modes of operation depending on the required consumption and type of fuel used, vehicle operating conditions and other characteristics. Malfunctions in the operation of the electronic unit or its incorrect setting can lead to both a loss of power and the inability to operate the engine itself.

Specific engine malfunctions

Old car models with a carburetor are still quite actively used by domestic motorists. The failure of various components of such power systems is manifested in a noticeable drop in engine power, and has the following characteristic malfunctions:

Failure of the fuel pump, causing a drop in pressure in the system.
Dirt getting into the carburetor, which clogs the jets and causes problems with the operation of the needle valve.
Incorrect adjustment of the composition of the combustible mixture.
Violations in the operation of the carburetor dampers and economizer valve.
Float not working properly.

Some models of new engines have one or more turbines that force air into the combustion chamber, thereby increasing the amount Horse power that the power unit is able to issue. Breakdowns or disturbances in their work cause a sharp drop in the throttle response of the power unit.

A drop in engine power should be the reason for diagnosing a car to identify a malfunction and completely eliminate it. It’s good if the cause of the loss of dynamics turns out to be such easily eliminated causes as low-quality fuel, clogged filters or old spark plugs. But malfunctions in the operation of the gas distribution mechanism, wear of the piston group and other more serious problems require immediate repair, as they can lead to significant damage and significantly higher monetary costs.

How does it work electronic pedal gas, how are its advantages and disadvantages manifested, what malfunctions are most common, and how to deal with them? All these questions are very relevant, because today many car manufacturers have replaced the traditional cable drive to a more modern electronic pedal.

Electronic gas pedal - how does it work?

Modern technologies are aimed at making our lives as easy as possible. On the one hand, this is a huge plus, but on the other hand, they simply deprive us of the opportunity to make any decision, or rather, correct it, and in such a way that it is not always possible to achieve the desired result. This is clearly seen in the operation of the electronic pedal, which is so popular in modern automotive industry. Although for those who feel insecure behind the wheel, and even more so do not delve into the technical nuances of the car, this innovation is only a plus.

The principle of operation of the electronic gas pedal is as follows: after the driver presses the accelerator, data on the pressure angles immediately enter the control unit through special sensors. Next comes the move ECU, which calculates the required opening angle, and the drive, based on the data received, opens it to this angle. Moreover, if it is suddenly necessary to change the value of this angle (for a more economical mode or for safety), then the control unit does this itself, without receiving the appropriate command. It turns out that the driver cannot 100% regulate this process.

When do you need to replace the electronic gas pedal?

Due to the fact that this is an electronic drive, the main malfunctions in it are associated with electronics. Two sensors are built into the pedal bracket, which transmit commands to the control unit. If one of these sensors fails, then the light on the panel will light up, which is responsible for the health of the engine control system. In this case, the ECU goes into standby mode (revs increase much more slowly). If two sensors are out of order, it will turn on emergency mode, and the engine will work like on . Since the sensors cannot be repaired, the electronic gas pedal must be replaced.

The wiring may also be damaged, and then the operation of the throttle is disrupted. If the electric engine is worn out, then an error is also displayed on the monitor indicating an accident. These damages can be repaired, but if the accelerator of the electronic gas pedal, which is responsible for the dynamics of the car, is out of order, then this part should be immediately replaced with a new one. How to do this, we will consider a little lower.

Repair of the electronic gas pedal - we fix the breakdowns ourselves

Basically, in case of any problems, the replacement of the entire assembly as a whole is required. But before embarking on such decisive action, it would not hurt to find out the cause of the breakdown. To do this, of course, you should read the information on how to check the electronic gas pedal. To do this, it is necessary to disconnect the block and sensors, and then, unscrewing the fixing nuts, dismantle the pedal.

Directly for verification, you will need a multimeter: by connecting it to different terminals, we monitor the change in electrical resistance. It should decrease smoothly, but if jumps are observed, then the part is faulty.

In some cases, it is also possible to repair the electronic gas pedal, for example, if the wiring is damaged. So, having discovered a defect (the insulation is broken, the wires themselves are damaged, etc.), you need to act according to the following scheme. Having freed the axis of fastening of the gear, remove the harness. To do this, unsolder the wires, release the bracket and pull out the cable. Then we replace the wires, and, having disassembled the connector under the pedal, we solder them. Now you can assemble the damper and drive safely.

If the car reacts to pressing the accelerator, so to speak, “with a delay”, then a spur (electronic corrector) of the gas pedal is needed. This device allows you to reduce the interval between pressing and opening the damper to a minimum. This is a separate module that connects to the sensors and converts the signals from them through the microprocessor, and then feeds them to the controller.

So we see that the electronic gas pedal, tuning of which is possible in any specialized center, on the one hand, is a clear result of progress, and on the other, it somewhat limits our desires. True, if you do not belong to the category of those people who need to “ride with the breeze”, but prefer to drive carefully with minimal cost fuel, then this option will be just for you.

The lack of engine speed when pressing the gas pedal is a common problem that most drivers have encountered. The reasons for this unpleasant situation many: it can be either a transition from a gasoline engine to gas-balloon equipment, or a simple engine malfunction. Let's explore the reasons in more detail.

The engine does not gain momentum when the gas pedal is pressed: reasons

First of all, it is necessary to pay attention to the "symptoms" of the problem: when it manifests itself, how, whether there are additional signals indicating a malfunction. It is possible that the engine is fully functional and the sensor that was disconnected during repair prevents it from functioning normally. The master can fix such a problem after a short inspection.

If engine failures occur without any serious reasons, a thorough diagnosis is required.

Let us dwell in more detail on the reasons that the owner of the car can fix himself.

key factor reliable operation engine - the quality of the fuel mixture, the features of its supply, ignition and combustion in working area motor. Violation of any of the above processes leads to problems with engine speed. That is why in case of failures in the internal combustion engine, the first thing you should pay attention to is the operation of the fuel and oxygen supply system.

If dirt, a mixture of oil and sand has accumulated in the air filter, the air will penetrate into the engine unevenly, which will lead to a loss of engine power and, accordingly, to “missed” revolutions.

2. Violation of the intake system leads to excessive air suction. Failure can occur suddenly, or it can go into a chronic stage. The intake of a large amount of air impoverishes the mixture, there are too few flammable vapors in it. In this case, the motor starts, but during the trip the car cannot gain the necessary speed in any way.

3. Lack of fuel in the engine. This problem is most often caused by a clogged filter. There is enough fuel to start the engine, but it is no longer enough for normal driving. As a result, the car twitches, does not listen to the gas pedal well. During a set of revolutions, so-called "dips" are observed.

4. Accumulation of dirt on the fuel pump filter. The filter is a small mesh, when oily deposits get on it, the pressure in the system rises, and a sufficient amount of fuel does not enter the combustion chamber. When the fuel pump filter is dirty, the engine starts to work intermittently in almost all modes. When trying to gain momentum, the internal combustion engine may simply stall.

5. Problems with spark plugs or wiring, leading to problems with the ignition of the combustible mixture. In this case, the fuel does not ignite at the right time, the engine loses power, and the system is not able to gain momentum. Candles can get oily and dirt can accumulate on them. Common causes of spark plug failures include damaged shrouds and improperly set electrode gaps.

6.
Breakage of the electrical wires connected to the spark plugs. In this case, the engine troit, starts up "once again", the engine picks up speed with great reluctance.

Correcting these problems is not difficult: you need to check if the spark plugs and wires; check the pressure level on the fuel rail pressure gauge; remove oily deposits and dirt from the air filter; change the fuel filter to a new one; clean the fuel pump grid from mud deposits, etc.

Engine speed may drop by more than difficult reasons, which cannot be eliminated on their own, since repair requires special knowledge, experience and the availability of diagnostic equipment.

You can’t do without the help of a car service if:

Failure in the phases of the gas distribution mechanism of the car. If the timing is disrupted in the engine, the fuel inlet and exhaust gases are uneven, the valves open intermittently. A similar problem often occurs after a poor-quality repair to replace the timing belt drive, with improper valve adjustment, malfunctions of the gas distribution phase change system and failure of the timing chain.
Violation in the operation of the coils or the ignition module. The main "sign" of this problem is that the engine starts to triple, misfires are observed in the cylinder system, the number of revolutions decreases.
Malfunctions in the power supply of injector nozzles. The most common cause of this malfunction is poor wiring. The electrical signal does not reach the nozzle or reaches it at the wrong time. Naturally, under such conditions, the nozzle cannot work correctly, which is why the fuel ignites unevenly in the cylinders, the engine power drops along with the speed.
Problems in the operation of the fuel pump. An unpleasant breakdown that develops slowly but inevitably. As a result, the pressure created is not enough to operate the engine: the engine will stall.
Dirt in the injector. This problem can be caused by the use of low-quality fuel and contamination of the injectors. It is recommended to clean the nozzles after 35-45 thousand km. run.
The unsatisfactory condition of the systems responsible for the removal of gases, primarily the USR, soot filters and catalyst. A large amount of carbon dioxide remains in the engine and the engine is not able to gain the required number of revolutions under such conditions.
Failure of the devices of the internal combustion engine electronic control system, leading to a change in the composition of the combustible mixture.
It is impossible to exclude the breakdown of the electronic control unit. This trouble can occur after a poor-quality firmware repair. The main signal of malfunctions in the ECU is the spasmodic operation of the engine, an unexpected increase and a drop in torque.

Simple service procedures performed in a timely manner, such as cleaning the injector, replacing candles or filters, are an excellent prevention of any problems with the engine.

For a car on gas, the correct setting of the engine and the fuel supply system is of key importance.

Failure when pressing the gas pedal: causes and solutions 3.59 /5 (71.85%) 27 votes

Crash when pressing the gas pedal, accelerator pedals, a problem rarely encountered in modern cars, but common in cars VAZ. The problem is that pressing the pedal has no effect. And after a few seconds there is a jerk, the car twitches. A serviceable engine quickly responds to pressing the gas pedal.

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If you find such a problem in the car, do not delay troubleshooting for later. You can diagnose the problem yourself, but the best option going to a car service. Mechanics with extensive experience and modern equipment will quickly find the cause of the failure of the gas pedal.

IN winter period, especially on slippery road, sharp acceleration car can be a serious problem. In case of loss of control, an emergency situation may occur.

Does not bode well for failure while overtaking a passing vehicle on the road. You will have to apply hard braking and return to your lane, but there may be another car there.

Remember! If the first signs are found, immediately perform a diagnosis or head to the nearest auto repair center.

What are failures?

Failure when pressing the gas pedal is an improper response to this motor. Thus, when trying to accelerate the motor does not gain the necessary momentum.

This results in a drop in speed. It manifests itself with gradual and sudden acceleration. Dips appear when you press the gas pedal in different ways:

Short term failures. There is no response to pressing for a couple of seconds.
Lingering failures. The motor loses speed for 4 to 10 seconds, while it is possible that the car will stall.
Jerks. Dips up to 1 or 2 seconds. The car seems to "twitch".
A series of jerks. The engine speeds up and then slows down even though the pedal is in the same position.
The car jerks. Consists in a series of protracted failures.

Causes of failures when pressing the gas pedal

Consider the main reasons:

Spark plugs and high voltage wires;
Clogged fuel injectors;
Throttle valve dirty;
Ignition set incorrectly;
Errors in the ECU;
Air filter clogged;
Malfunctions in the operation of the fuel pump.

Often times, failures are due to power system failure. After pressing the gas pedal, the power system increases the amount of fuel that is supplied to the cylinders. A breakdown causes a change in these proportions. Those. The motor just isn't up to the task.

In addition, it is possible that the breakdown may be in ignition system. It occurs much less frequently. It's either spark plugs or ignition wires. Candles must be removed and checked. The presence of carbon deposits, or candles that are too clean, indicate an enriched or lean fuel mixture, respectively. And this indicates that the ignition system is adjusted incorrectly.

Dips when pressing the gas pedal during acceleration

Defined as using computer diagnostics, so the steps below (some of the points below can be done independently, but it is faster and more accurate to determine trouble spot specialists in car services in Moscow will be able to):

The first step is to inspect the spark plugs. To do this, you need to extract them. The presence of soot on candles, poor contact with wires, an excessively lean or rich mixture lead to malfunctions of candles.
High voltage wires can also cause the engine to malfunction, as can ignition coils.
Throttle needs to be checked. If it is clogged, then this causes an untimely reaction of the motor to pressing the gas pedal.
It is necessary to check the condition of the air, fuel and oil filter. They tend to become clogged, which worsens dynamics, increases fuel consumption and causes pedal failures. You need to change them constantly, you can do it yourself, they are inexpensive and easy to install.
The presence of errors in the ECU leads to failures.
Clogged nozzles. If necessary, replace either.

The wires, as well as the rubber bands on them, should not be damaged and should not spark when the engine is running. If damage is found, this indicates engine tripping, twitches begin. This may occur due to the age of the car, worn or low-quality spare parts, poor contact with spark plugs, or due to engine temperature.

Coil resistance and temperature change together, causing the gasoline car to twitch during acceleration. diesel cars, jerks cannot be associated with coils, since there are none.

Problems also occur in Idling, the reasons, of course, will be less. However, this is also a serious problem, and it cannot be ignored, because. the car will start badly and simply stall.

Troubleshooting is done in the following order:

The first step is to check the spark plugs. If the spark plugs are faulty, they should be replaced. We recommend replacing all spark plugs at the same time. Get spark plugs for your engine. If necessary, adjust the gap, it should be 1 mm for 92 gasoline.
The fuel filter and fuel pump diagnostics are checked. If you find a problem - fix it.
The failure may be in the idle speed sensor.
Checking injectors. If clogged, it needs to be replaced or cleaned.
Diagnostics of the ECU for the presence of errors.
Injector check.

As noted above, the problem occurs in VAZ 2107, 2106, 2109 cars that have a carburetor installed. Basically, problems with fuel system. Rather, it will be clogged. Therefore, to identify the cause, the fuel supply to the carburetor is checked.

As a result of clogging, the operation of the fuel pump decreases, the carburetor begins to receive less fuel. As a result, the engine starts and runs on idling no problem, but when pressed, dips occur.

If with fuel system everything is fine, then the fault must be sought in the carburetor. He is responsible for dosing the supplied fuel into the air stream. Violations result in failure. However, first you need to check for air suction. The carburetor mount can loosen, which will suck air through the gap, making the mixture lean.

The filter mesh must also be checked. It is located in the inlet fitting of the pipeline, which goes to the fuel pump. If it is polluted, then this is a consequence of failures.

Dips when pressing the gas pedal on the carburetor:

To determine the causes of the failure of the raspberry gas pedal with an injection motor, special equipment is needed with which diagnostics are carried out. Therefore, to detect a malfunction, you should definitely contact a car service in Moscow.

Most of the jerking occurs at low fuel pressure or due to problems with the condition sensor. throttle valve.

The pedal falls off when the car starts to move

All unpleasant sensations are most often associated with a delayed reaction of the motor to the squeeze of the pedal. Often there is a jamming of the engine.

The shocks appear at the time when the throttle opens, then the sensor gives a sign and the ECU determines at what time to switch from idle to load mode, and also how much to increase the fuel supply through the nozzles. If the pressure is not as high as you would like, and if you increase the injection time, then there will not be enough fuel to move the car from a place.

Also, the cause of jerks can be problems with the electromechanical part of the unit and due to clogging with waste.

Pedal failure during acceleration

Too much low fuel pressure- the reason for the failure of the pedal and during acceleration. Also, a failure can occur with the automatic gearbox due to a lack working fluid or due to a faulty gearbox.

A car with automatic transmission accelerates jerkily on its first trip after connecting the battery. This is normal, after a couple of overclocking everything will go back to normal.

Dips when pressing the gas pedal on the injector:

Pedal drops when movement is set

The reason may be faulty ignition. In this case, it is necessary to perform diagnostics and repair work.

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You can try to fix the breakdown yourself:

First, you need to look under the hood and inspect everything. Remove the key from the ignition, check that the ignition coils are securely attached and seated on the spark plugs. Next, start the engine and listen to how it works.
Carry out the replacement of candles, regardless of what condition they are in and how long they have served. Look at the candles - if they are damaged, then engine repair is inevitable.

The gas pedal fails in a VW car POLO sedan due to the unstable operation of the damper position sensor, which is built into the cover itself. The engine runs intermittently at idle, the engine power is reduced to a minimum - this all indicates the failure of the sensor.

The cover itself is not disassembled, so you will have to replace the entire throttle assembly.

You must understand that even after considering in detail the reasons dips when pressing the gas pedal, for the product self diagnosis you need to have certain knowledge in the device and the principles of operation of the car. Otherwise, it can turn into an additional headache.

If you encounter this problem, you can replace the spark plugs. Such a procedure will make it possible to postpone the call to a car service, or it will really help to solve the problem.

Good to know! If a rumble appears during coasting, which is accompanied by vibration, then it is most likely necessary.

If you have the necessary level of knowledge, you can try to fix this breakdown yourself. It is better to start looking for a problem with spark plugs and BB wires, and only after that move on to more rare causes. But in the end, you may spend more time, do a lot of unnecessary work, and most likely not find the reason why the engine does not pick up speed when you press the gas pedal.

October 14, 2017

The most unpleasant type of malfunction is when something in the car is half broken. In such cases, troubleshooting turns into a difficult task, reminiscent of catching fleas. A common example: the engine does not pick up speed after pressing the accelerator pedal. The car drives, but is not able to accelerate to normal speed - the engine "sneezes" and stalls. If you decide to find the problem yourself, check out complete list reasons causing inadequate behavior of the power unit.

Fuel system problems

If you encounter a problem with a drop in engine power, start looking for a malfunction from the fuel supply system. After all, if the engine does not respond to the opening of the throttle or starts to stall, it is logical to assume that it simply does not have enough fuel. Your actions:

Remember when the filter was changed fine cleaning and check its status. A clogged filter element does not allow enough gasoline to pass through, which is only enough for idling without load.
A common cause is a fuel pump mesh clogged with dirt located in the tank. Often, motorists ignore its replacement, installing only new filter. To check the coarse mesh, you will have to disassemble the gas tank and pull out the pump.
The pressure bypass valve, which dumps excess fuel back into the tank, has failed. It is checked by measuring the pressure in fuel rail through a special fitting.
If you smell gasoline in the closed garage where the car is stored, walk along the entire fuel line, inspecting for leaks.

Note. A clogged filter is indicated by a prolonged noise from the fuel pump, audible after the ignition is turned on. The unit cannot raise the pressure in the line to normal and does not turn off for a long time.

More serious problems are harder to detect. Both petrol and diesel engine may suffer from improper operation or injector failure. Their performance is checked by removing and connecting to a power source. The atomizer must create an even, beautiful "torch", otherwise it must be replaced.

The reason for the lack of fuel in diesel engine often becomes fuel pump which creates high pressure in the system. When the parts of the unit are worn out, the pressure in the line drops below normal, and little diesel fuel is injected into the cylinders.

Together with fuel filters It doesn't hurt to check the air one as well. Blow out the contaminated element if you cannot immediately change it.

Ignition faults

In cases where, when you press the gas pedal, a lumbago is heard in exhaust pipe or the engine starts to “triple” at idle, try to find a problem in the ignition system. Weak sparking on the electrodes of the candles leads to incomplete combustion of the air-fuel mixture and loss of power by the power unit. The reasons for the malfunction of the system look like this:

Problems with one or more high voltage coils.
Loose wire insulation high voltage going from the coils to the candles.
Due to the long service life, the candles themselves have worn out.

The insidiousness of worn candles lies in the fact that during the test they give a normal spark.. But in the engine cylinders there is a high pressure at which the old candles die out. That is why the engine does not develop speed, but hard pressing accelerator pedal causes "failure". It is necessary to check the candles on a special stand that creates a pressure of at least 20 bar.

You can diagnose a breakdown of a high-voltage wire or candle insulation in a dark garage. Open the hood, start the engine and watch it work. If you notice flashes of sparks on the "cradles", install new parts.

The failure of the coil or the breakage of the high voltage wire is indicated by the complete failure of one of the cylinders. Testing a wire is easy: swap it with an adjacent one and make sure that the other cylinder has stopped working. With coils, this technique will not work; special equipment is needed for diagnostics.

Motor problems

Critical wear of the cylinder-piston group of the power unit also leads to a decrease in power. There are other reasons why the engine is not gaining momentum:

valve burnout in one or more cylinders;
lack of compression or its fall below an acceptable level;
incorrect adjustment of thermal gaps between valve stems and rocker arms;
malfunctions of the belt or chain drive of the gas distribution mechanism.

Most of these faults are detected by measuring compression. A burnt valve does not fully fit into the seat, due to which the pressure in this cylinder drops to 2–3 bar, and sometimes even to zero. The general decrease in compression in all cylinders to the level of 9 bar or less indicates "spurious" piston rings.

Advice. Before announcing the verdict of the cylinder-piston group, it is worth checking thermal gaps probe. If recently some "specialist" made an incorrect adjustment and clamped the valves, then the compression will also decrease.

Similar errors occur when replacing a chain or timing belt, when the marks are shifted by 1 tooth. Consequences - violation of the valve timing and loss of power plus unstable work engine. A similar effect is faced by negligent drivers who do not follow own car: due to wear, the chain (belt) is greatly stretched and jumps on the gear camshaft for 1 tooth.

Too high oil consumption, penetrating into the combustion chambers through the valve seals, also worsens the operating conditions of the power unit. From the inside, the walls of the chamber and the electrodes of the candles are covered with soot, and the piston rings coke and lie. A sure sign of a malfunction is clubs of blue smoke from the exhaust pipe.