Why does the car jerk when the gas is pressed. Why does the car jerk when I press the gas pedal?

To understand the possible cause of the breakdown, you should clearly identify the symptoms, and based on this, draw some conclusions.

When the car is warmed up to operating temperature, when you press the gas pedal, it starts to "dull" or twitch a little, and then, when accelerating, this problem disappears and the car works in normal mode.

If this problem occurs only during overclocking, and not, for example, when starting from a place, then the reasons will be the same. If the car jerks when starting from a standstill, then this may be a problem with the clutch or basket. If vibration is felt during driving and not only during acceleration, this may indicate a failure of the pillows that secure the engine.

Diagnostics can also be done at the service center. Especially if the car is injector, you need a special device. It is connected to the control unit and shows where and on which sensor the problem is possible. The same goes for diesel vehicles. A special stand is needed to test the injectors of a diesel engine. Without it, it is impossible to determine what state they are in.

Reasons for jerking during acceleration

There can be several reasons for the jerking of the car during acceleration.

Malfunctions in the engine ignition system

If the ignition is lost, then just during acceleration it will be strongly felt. This happens because when the gas pedal is pressed, fuel is injected into the cylinders, and detonation should occur there. If the ignition is set incorrectly or is out of order, then the fuel comes in, and the spark strikes at the wrong time. In other words, some part of the fuel is not ignited or ignites at the wrong time. Some cylinders may not detonate at all. This all leads to unbalanced work and, therefore, jerks. Defective candles or armored wires can also be the reason. It is advisable to change the candles sometimes. The spark plugs are checked on special equipment, where, at the same pressure as in the engine, it is checked whether the spark plug gives a spark.

Even when candles look good and free from defects, this does not mean that they are excellent at work. It is recommended to buy candles from not the cheapest manufacturer, since even new ones may not pass the test stand.

Armored wires are checked with an ohmmeter for the presence of the required resistance. You can also check the quality of the wire connections with candles. The procedure should be carried out with a warm engine. It is necessary to collect water in a bottle and, using a sprayer, distribute it with the engine running to the armored wires and the connection with the candles. If the engine speed starts to decrease and the car starts to run, then the wires should be replaced.

If there is no understanding of how the ignition is exposed, then it is better to consult a specialist. This process is quite accurate, you should not make mistakes there.

The most common reason for jerking a car during acceleration is a malfunction in the power supply and fuel supply system. When you press the gas pedal due to contaminated elements of the fuel system, there is not enough fuel to accelerate. That is why jerks occur during acceleration.

The problem might be:

1. Filters. The air filter and fuel filter must be changed regularly. This is a consumable that quickly breaks down.
2. Dirty fuel supply systems. In carbureted cars, these are jets in which the slightest dust or bits of dirt strongly affect the fuel supply. Injector nozzles can become clogged.
3. Fuel pump. If it fails or partially begins to show lower performance, namely, does not have time to pump the required fuel pressure into the system, then during acceleration this deficit will be visible.

There are various aerosols and additives for cleaning fuel systems. If you choose a product from a trusted manufacturer, they work very well. But this may not be enough in all cases. There are cases that require mechanical cleaning or repair of individual parts. The valve or some other part of the mechanism may fail.

Other defects

Poor quality fuel can be attributed to other reasons. When filling with low-quality fuel, which is very different from the previous one, you may feel a drop in power or "stupidity" when you press the gas pedal. If everything was fine, and then you went to a gas station, where you have not yet been, and it was after this that the problems began, then the conclusion is obvious. This problem is very common in gas vehicles.

Elimination of identified problems

After the cause has been identified, you can begin to eliminate it. In most cases, this work should be entrusted to specialists. After all, not always the reasons that at first glance were key are just such. Correct ignition setting, carburetor, injector adjustment is what is best left to a knowledgeable person. If it was found that the jerking was caused by dirty filters, then you can use an aerosol cleaner. It is sprayed into the air filter opening. Also, additives in the fuel tank show themselves quite well. These additives clean the fuel lines and all other elements. XADO additives have proven themselves well.

Sooner or later, every car enthusiast has to face the following problems:

• The appearance of malfunctions in the valves;
• Sharp jerks of the car (there is a feeling that it twitches by itself);
• Lack of instant response of the engine to pressing the gas pedal.

Moreover, when you press the gas pedal, the car begins to twitch not only when idling, but also during acceleration and at full speed of the vehicle. To understand how this happens, what is the reason and what needs to be done to correct the situation, it is necessary to move from the symptoms to the causes of the breakdown.

The main reason for "jerking" the car when you press the gas pedal

The main cause is most often associated with an oxygen rich / depleted fuel mixture. It is because of the lack of air that the crankshaft continues to rotate despite the fact that the gas pedal has long been released. In addition, when the pedal is pressed sharply, the motor jerks and rotates in place.

The root cause of the problem is the preparation of the wrong mixture. In turn, the mixture can be supplied to the engine in different ratios due to a malfunction of other devices and components of both the engine and the fuel system.

Twitching of the car due to a malfunction of the TPS

The second sensor that affects the supply of air to the system is the device for adjusting the mass flow of oxygen in the system. It works in the injection type of engines and is responsible for supplying air when the fuel mixture is formed. If this component is defective, then your car will also twitch, not even having time to accelerate. The solution is the same with the first sensor - dismantling and complete replacement of the mass air flow sensor.

Jerking the car - a malfunction in the carburetor chamber and pump

In the event that the engine starts to work with jerks in carburetor machines, even with a weak pressure on the gas pedal, the main attention should be focused on the carburetor chamber. The problem is often associated with clogged outlets that are located in the first of the carburetor chambers.

When the fuel enters the engine, it takes with it part of the burning and metal shavings, as a result of which the mixture undergoes changes and the engine is unstable. You can solve this problem yourself - just remove the carburetor and blow out all its pipes and openings with compressed air.

A classic example is the following situation: when the pump is damaged. As a result of failure of the accelerator pump of the carburetor, the mixture is supplied to the motor in an incomplete volume. The result is the appearance of jerks during even a smooth pulling off attempt. In most cases, it is impractical to repair pumps, which is why they are simply changed in a car service.

carburetor chamber

Twitching the car during acceleration

This problem can manifest itself with a smooth set of revolutions, which is accompanied by a sharp short jerking of the vehicle. In this case, the reason is associated with the lack of a constant flow of the fuel mixture into the float chamber of the motor. That is, the fuel is burned in the chamber much faster than the fuel pump distills the new stream. As a rule, it is possible to find a breakdown in the design of the fuel pump.

The solution to the fuel pump malfunction takes place in 3 stages:

• Remove the top cover of the pump and carefully examine the surface of the hole where the valve structure should be located;
• If the O-ring is abraded or missing, fix a new one;
• If, during the diagnosis, a chamber depressurization is detected or the problem is related to interruptions in fuel injection, then the final stage will be associated with a complete replacement of the inoperative valve and further restoration of the sealed state in the system.

Advice: when repairing, do not try to patch up holes in the old cylinder and reinstall it. This can further lead to a major overhaul of the entire engine structure.

fuel mixture

The appearance of jerks in the car with a sharp press on the gas

If the reason is not related to the gasoline pump, then these symptoms may indicate the so-called "triple" of the engine. In the machine, a situation arises in which only one of the 4 cylinders can work correctly. As a result of “triplet”, the motor simply cannot respond in time to pressing the gas pedal, after which such problems arise. You can deal with the breakdown in the following ways:

• If the oxygen supply sensor is not working correctly, the system is diagnosed using a multimeter. In the event of a malfunction, it is simply replaced.
• If the valve timing in the motor is shifted, it is necessary, with the help of car service specialists, to adjust them according to the appropriate instructions.
• The detection of an incorrect glow plug number is solved by installing a new set with the correct number.
• The problem of clogged nozzles can only be solved in a car service. To do this, they are installed on a special stand that simulates the operation of a motor, and washed with a special solvent.
• Also, a problem can arise when the emulsion tube and well located in the structure of the second chamber of the carburetor motor are clogged. The only solution here is to flush the carburetor and tube with kerosene.

Engine jerking due to problems with the ignition system

If, when the car picks up speed, you observe sharp drops in power, then the reason lies in the malfunction of the elements of the ignition system. This problem applies to any type of engine. The only correct solution is to check the ignition with the engine off. It is carried out by the following features:

• The tightness of fixing the blocks with wires is checked;
• Lack of chips and good condition of the coil;
• Serviceability of the wiring connecting the ignition system to the engine.

After checking all the elements, you need to start the car and just listen to how the engine began to work. If you find the appearance of characteristic clicks, then there are small high voltage breakdowns in the system. In this case, you will have to buy all the elements of the ignition system - a coil, a block and a set of high-voltage wires.

Advice: do not try to replace the wiring on the machine yourself. Only highly qualified specialists can correctly connect relays and fuses using instructions and diagrams, after which the ignition system will not burn out. You can also check the wheels at the same time by comparing the indicators in.

If the engine runs smoothly, the problem may lie in the spark plugs. And they ate to be more precise - in the absence or rare appearance of a spark. The presence of defects in the sparking system can be easily detected if the car engine starts to jerkily when descending hills and even on level road sections.

For example, the problem with a set of candles is typical for vehicles under the Nissan brand. This is due to the equipment of their engine model CA-18 with a special design of a contactless distributor. The distributor housing contains a switch, in the event of a malfunction of which the spark signal does not go to the on-board computer, and such a specific movement of the machine occurs. It is possible to correct the jerks of the motor only with a complete replacement of the distributor components.

If the set of candles is in excellent condition, the only remaining reason can only be malfunctions in the operation of the control unit of the carburetor type of the motor. At the same time, jerks do not occur constantly, but accidentally and only during a long car ride.

It is possible to detect faults in the control unit only after diagnostics in a car service at a special stand. Also, with the help of a lift, it will be possible to see that the car at idle speed occasionally twitches. As a result, the control unit (EFI) should be replaced along with the breakdowns found in other parts of the vehicle.

car pads

Video: the car jerks when driving - several reasons

Most car enthusiasts face the problem of motor jolts during smooth or sharp acceleration. This problem is not critical and can be easily repaired. Moreover, users of both domestic VAZ 2112 on block 16, and the owners of foreign cars like Hyundai Solaris are not insured against this. If the car jerks when you press the gas pedal, you need to investigate such units.

1. Fuel supply. As a rule, problems begin with acceleration after refueling at a dubious gas station.
2. Air in the system. Excess oxygen can also be sucked in through cracks or leaky clamps.
3. Ignition. This topic is worthy of a separate issue.
4. Pressure lines. Fuel pumps, ramps, injectors, filter inserts are blocks that require special attention.

So, you should figure out what to do when the car starts to twitch during acceleration.

Diagnostics

The diagnostic procedure for different engine designs is performed according to a different algorithm. However, there are general faults.

In the process, it is necessary to check the fuel system, air supply lines, and the ignition device. In this case, troubleshooting is carried out alternately for all units. If the sequence is successful, the damaged node is changed to a known good (new) one.

What to do

In the absence of knowledge or lack of confidence in your own abilities, you can ask for help at the service station, where the masters will conduct a diagnostic examination and repair the car.

If the user decided to figure it out on his own, do the following.

When piling on the gas, the car jerks and does not go

In the case when the car behaves predictably at idle, and when the trigger is pressed, jerks are felt, and the car slowly picks up speed. The matter lies in the lean or re-enriched mixture entering the cylinders. It does not matter whether it is an old VAZ or a new modification of the Hyundai Accent type. The original source is right here.

The secondary question is how this happens, because in 50% of cases the carburetor or injector is set up correctly.

The car jerks when accelerating and pressing the gas sharply

A similar symptomatology occurs on injection foreign cars - when the trigger is pressed firmly, the car pulls. In this case, acceleration occurs in normal mode. For cars such as "Ford Focus", "Opel-Astra J", "Chevrolet Cruz", the case may be in the breakdown of the ECU, DMRV, DPDZ. Also, the problem is not bypassed and modifications of the VAZ 2114, Audi A6 C5.

The easiest diagnostic method is to replace parts with known new ones. Thus, the throttle position sensor can "blunt" by incorrectly indicating to the ECU the location of this unit, which causes a variable opening of the throttle with all the ensuing consequences. Also, the DMRV may misinterpret the indicators, which will cause the mixture to deplete.

When you press the gas pedal, the car dulls, then jerks sharply

When the vehicle dulls during acceleration, followed by a sharp jerk, and then the dynamics stabilize. You need to check the following items:

• air line;
• accelerator pump;
• fuel quality;
• main fuel pump;
• ignition settings;
• mRV sensor.

The owners of the Lada Priora car periodically face the problem of fuel pump failure. Here, it will be enough to replace the element with a new one, to insure, unclog the highways (poor-quality fuel could get in).

Also, in some cases, the engine begins to triple and then accelerate. Here, the mass air flow sensor is called, spark plug diagnostics, ignition angle check, nozzle blockages.

Additionally, if there is an automatic transmission, this mechanism must be checked. About 20% of visits to a car service with similar malfunctions end with a "surprise cure" inside the torque converter.

The car jerks on the move when you press the gas pedal slightly

A more exotic malfunction, when, when the trigger is smoothly pressed, the car begins to twitch before reaching a certain speed of the power plant. Here there is a shortage of combustible mixture in the float chamber of the internal combustion engine - gasoline burns out faster than it has time to enter. This is a side effect of a faulty fuel pump, the unit does not have time to pump a new portion of the mixture, which provokes the motor jolts.

Note! On independent structures like the carburetor Oka or the injection "Lanos", the breakdown in 90% of cases manifests itself in the same way, which narrows the search area.

Auto jerks when you press and release gas

If, when the speed is reduced, the car starts nodding, and during acceleration it twitches again, there can be two sources of the problem.

1. Sensor failure. Defective sensors send incorrect data to the ECU, causing a failure in the uninterrupted fuel supply.
2. Dosing elements (nozzles, nozzles) clogged. Owners of classic models of the VAZ 2107 type often face a similar problem. A clogged nozzle, after the gas is released, "spits out" part of the fuel, which causes an increase in speed. With a sharp acceleration, the element does not have time to supply the required amount of the mixture into the cylinder.

Carburetor car jerks when you press the gas

If a problem is detected on carburetor cars such as VAZ 2109/2106. First of all, you need to pay attention to the fuel supply system. The design of standard Solex carburetors has outlet pipes designed to supply gasoline to the mixture formation chamber. By pouring low-grade fuel, thin channels can become clogged, preventing its free passage.

Usually the channel of the first chamber is clogged. If the engine jerks during a set of revolutions, and after reaching 2500-3000 rpm the acceleration goes smoothly - the trouble is here.

The defect is eliminated by blowing the unit with compressed air with preliminary cleaning of the nozzles (just in case).

It is also necessary to check the main pump (the sore of all the classics), and the ignition moment.

When you press the gas, a car with an injection engine jerks

If the VAZ 2110 injector twitches, the search for the problem should start from the MRV, PDZ, ECU sensors. In this case, faulty sensors can give a false signal to the control unit, which is the primary source of trouble.

The next reason is the clogged nozzles. Symptoms usually appear 15-20 km later after filling low-quality fuel into an empty tank.

The last moment is failure, ignition interruptions. Candles, armored wires are diagnosed.

When you press the gas, the diesel car jerks

Regarding the diesel engine, the solution to the problem is extremely simple - jamming of the moving blades of the main pump. The reason for this phenomenon is considered to be a long idle time for transport in a damp place. It is moisture that oxidizes metal surfaces, which leads to the structure jamming.

Elimination of damage is performed by replacing the damaged part.

conclusions

Regardless of the specified primary sources, the main problem of breakdown is the human factor. To prevent problems with a car, it is necessary to pass service procedures, inspections in a timely manner and use only high-quality consumables.

From time to time, every car owner is faced with a situation where the vehicle begins to twitch when starting to move when pressing the gas pedal or driving at low speeds. This behavior of the machine is often caused by not too serious disturbances in the operation of the internal combustion engine and other systems. However, they need to be diagnosed and eliminated as soon as possible. Otherwise, they can lead to complex damage, which will take a lot of time and money to fix.

When can "jerking" of the car appear and what are the reasons for the phenomenon?

In the vast majority of cases, a symptom in the form of an unstable car ride can be diagnosed in the following situations:

When the car starts moving (starting off).

During slow movement with low engine speed.

If necessary, accelerate sharply while driving on the road.

During operation of the power unit at high speeds.

In addition, the described behavior of the car can be manifested in other modes of operation. The reason for this may be malfunctions of the following systems and components of the machine:

1. The system for supplying the fuel mixture to the combustion chamber.

2. Ignition system.

3. Incorrect transmission operation.

4. Violations in the operation of the electronic control unit of the car engine.

How do I troubleshoot?

Let us consider in more detail the main and auxiliary systems of the car, which can cause the vehicle to "jerk" while driving. We will also dwell on how to eliminate the diagnosed problems.

Fuel mixture supply system

Quite often, the reason for the unusual behavior of the car while driving is improper operation of the fuel supply system to the engine or the injection system of the fuel-air mixture into the combustion chamber. In other words, the internal combustion engine cannot receive the required amount of gasoline or diesel fuel. As a result, there is not enough shaft to transfer the mechanical force to the suspension, and you end up with sags in power.

To get rid of trouble, you must:

Check the operation of the throttle assembly.

Test the performance of the sensors.

Check the correct position of the throttle valves.

and IAC

Check the operation of the MAF sensor.

check

In most cases, the defect is found in, which are responsible for the injection of the fuel mixture. Less commonly, the uneven ride is associated with the air passages that connect the injector and. Depressurization is possible, resulting in pressure loss.

The found problem can be corrected by replacing damaged parts. You can do this yourself, but it is better to seek help from the specialists of the service center. After carrying out work, it is important to additionally check the tightness of the connections on all fuel and air supply lines.

If your car is equipped with a carburetor, it is necessary to check the idle valve, and also make sure that the body of the device itself does not contain cracks, chips or other defects.

Ignition system

The next most common reason for "jerking" a car is a breakdown in the ignition system. This leads to the fact that the fuel mixture in the cylinders ignites at the wrong time. In addition, this can also occur due to the fact that a low voltage current is supplied to the candles. And the resulting spark is not enough to cause ignition.

To diagnose faults, check:

Serviceability of the switch.

Often, the car can drive in jerks due to physical wear of the spark plugs or because the spark plug gap does not meet the required parameters.

Transmission

The "jerking" of the machine can also occur due to the fact that the transmission elements are not operated in accordance with the technical regulations. This happens, for example, if the transmission fluid has not been changed in the gearbox (especially automatic). And when the mileage of the car reaches 150-200 thousand km, it is necessary to repair the automatic transmission, otherwise the car will go with small jerks all the time.

It is better to carry out maintenance of such a complex unit as a gearbox only in a specialized center. You can take on work yourself only if you know exactly what and how to do it.

Accelerator

Let's deal with the situation when "jerking" occurs due to too sharp pressing on the accelerator pedal. In this case, the engine sharply increases its speed, which can lead to incorrect operation of the vacuum ignition angle regulators. When the car moves at low speeds of the internal combustion engine, the distributor sinks, which leads to jolts.

If the vacuum regulators do not work properly when you press the gas pedal, the engine of the car cannot increase the speed in time, and this, in turn, leads to problems with the operation of the throttle valve. As a result, the air-fuel mixture does not have time to burn, which damages the bearing, on which the ignition timing depends.

To diagnose the problem, you need to check the vacuum regulators. For this, the hoses and nozzles are disconnected, after which the holes are covered with hands. During the operation of the internal combustion engine, you can clearly hear the pulling effect. If no vacuum is formed, the tightness is broken and the assembly should be replaced.

If your machine is jerky, you should immediately identify the cause of the problem and fix it.

Many owners of cars, both domestic and foreign, often face the problem of jerking the car when pressing the gas pedal. There are many reasons for this behavior of the car. Therefore, we suggest further familiarizing yourself with the most common malfunctions that cause such jerks, as well as their symptoms and remedies.

1 Malfunction of fuel system sensors

A frequent cause of jerks when pressing the gas pedal is a malfunction of the TPS, especially this often happens in "VAZ" models. This sensor detects the position of the throttle valve. It is quite simple to identify its malfunction, thanks to a characteristic symptom - the car starts to "jump" during acceleration, even if the accelerator pedal is pressed very smoothly.

Most often, as a result of a TPS malfunction, the throttle valve remains in a slightly open position for a long time. When you press the gas pedal, the sensor does not immediately transmit a signal to the computer. As a result, the engine initially cannot change the operating mode, and then the fuel is supplied abruptly and in a large volume. As a result, the engine starts to "choke" and work in jerks, and sometimes even stalls.

There is only one way to solve the problem - to change the sensor. True, some car services offer controller repair. But, as practice shows, the repaired TPS serves no more than one or two months. Therefore, it is better to buy a new part right away. In the photo above, you can see the location of the TPS in a VAZ 2114 car.

Another sensor that causes the car to jerk when it fails is the air flow sensor (DFID). In the event of a breakdown, the engine starts to work unstable whenever the gas is pressed. As in the previous case, the problem is solved by replacing the sensor. Sometimes the problem is not the sensor itself, but the air duct (corrugation) that goes from the air filter to the engine. As a result of its depressurization, air can be leaked bypassing the sensor, which causes malfunctions in its operation.

In some cars, jerking when accelerating at idle speed can occur as a result of a failure of the crankshaft position sensor (DPKV), which is located near the oil pump. The photo below shows the location of the DPKV of the Priora car with the 21126 engine, i.e. having 16 valves.

To test the operation of this controller, you need to connect an oscilloscope to it. Smudged or barely noticeable pulses indicate that the sensor is really not working correctly. Please note that if it completely fails, the car stops starting altogether.

2 Problems in the fuel supply system

Often the car starts to twitch when starting off and gaining speed as a result of a lack of fuel in the float chamber. Most often, the malfunction manifests itself when the gas is pressed sharply. This is due to the fact that fuel is burned in the engine much faster than it enters the float chamber.

There are several reasons why such a situation may arise. Typically, fuel interruptions occur as a result of a malfunctioning fuel pump. To resolve this issue, you can follow these steps:

1. Remove the pump cover.
2. Examine the surface of the cover. Replace the O-ring if necessary.
3. If chamber depressurization or other fuel injection problems are found, the worn parts must be replaced.

Most often, the fuel pump is located under the hood. However, on some vehicles, it may be located at the rear. For example, in the VAZ 2110 and VAZ 2112 models, to access the gas pump, you need to dismantle the back seat and unscrew the cover, as shown in the photo below.

Sometimes the cause of all problems in the fuel supply system is trivial - the fuel filter is clogged. If it is not replaced in time, it can become clogged so much that the fuel supply will stop altogether and it will be impossible to start the car.

3 Malfunction in the mixture preparation unit

If the car dulls when picking up speed and starts twitching when the gas pedal is pressed sharply, it is quite possible that the malfunction lies in the mixture preparation unit, i.e. carburetor or injector. Most often this occurs as a result of clogged jets, air passages or nozzles. Car owners usually encounter a similar situation in the spring, after a long idle period or after filling with low-quality fuel.

In some carburetor cars, for example, the VAZ 2109, you can correct the situation without even removing the carburetor. To do this, you just need to dismantle the air filter located above the carburetor, and then blow out all the channels with a hand pump with a tapered tip. It is advisable to carry out the work together, so that one person substitutes the tip to the canals and holds it, and the second, with sharp and powerful movements, works with the pump.

Of course, such manipulations will not give a 100% result, moreover, the situation will not improve for long. But if the problem happened on the road, blowing with a pump can really help out. For normal cleaning, you need to contact the service center, where specialists will wash the carburetor with a special agent. The situation is exactly the same with the injector: you can only remove blockages by flushing. Moreover, for this it is necessary to use a special tool for injectors.

It should be carried out on a special stand that simulates the operation of the engine, therefore it is impossible to perform it independently.

4 We are looking for the reason in the electrician

Very often, the reason for the car jerking and slow speed up is the engine "undermining" due to faults in the ignition system. In this case, when the gas pedal is pressed smoothly, the problem is often not noticeable at all, but when pressed sharply, the engine seems to "choke". At high revs, "podtraing" also may not be felt. In motion, jerks can occur only at certain speeds or when the car is moving uphill.

Most often, replacing candles helps in this situation. However, candles are not always the problem. Often "podtraing" occurs due to problems with high-voltage wires that go from the distributor to the candles. You can identify a faulty wire by simply listening to the wiring while the engine is running. A wire that has a "breakdown" emits a characteristic clicking sound. You can even see a spark in the dark. True, in some cases the wires fail asymptomatically, therefore, the faulty element can only be identified by alternately replacing the wires.

Sometimes the problem is not even caused by the wires themselves, but the tips on the coils and candles. Accordingly, it is easily solved by replacing the tips.

These are all the common reasons why the car starts to twitch when you press the gas pedal sharply or even smoothly with your foot. If, after completing all the above steps, you did not manage to solve the problem, contact the service center, where specialists will perform computer diagnostics and determine the exact cause of the malfunction. Often, you can get rid of jerks only after flashing the on-board computer.