Why the car is twitching in motion. Why does the car twitch on the go? Causes of car jerks while driving How long do you do this

Various malfunctions associated with the operation of the engine, transmission and mounted units can manifest itself both at idle and under load in motion, as well as in transition modes. The breakdowns can often be determined by the presence of obvious leaks of technical fluids, explicit stacks, unstable work, failures, etc. Next, we will look at the possible reasons why, during the movement, the machine with an injector begins to twitch, that is, noticeable jerks appear.

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Fuel system problems

If the machine twitches when driving, then the diagnostics should be diagnosed with. The main symptoms of the engine power system faults are car jerks in motion. These signs of breakage are manifested in several situations.

1. There is a need to sharply accelerate. At this point, the driver strongly presses the gas pedal, but the desired pickup does not occur. Instead, the car twitches, after which it begins to accelerate with further jerks or without them. An option is also possible when the jerks begin after the gas reset.
2. The problem is noted in the case when the car suddenly pulls during the movement at cruising speed. In other words, the failures and jerks in the work of the engine can be noticeable both at the time of changing the speed of rotation (during acceleration and discharge of gas) and with constant engine speeds (the gas pedal is in one position).

First of all, it is necessary to eliminate the likelihood of refueling fuel, importing the fuel-fueling system and the flows of fuel highways. The next element that requires control is the fuel filter.

In the event of a reduction in its capacity, the engine will not be enough fuel, especially with a sharp rise of revolutions and the growth of the load on the power unit. It is also necessary to make sure that the air filter does not have significant contamination.

Excluding the above reasons must be proximized to check the injector. For accurate results, the fuel pressure is measured in the fuel rail (ramp), and the operation of the nozzles is checked.

Low pressure in the fuel rail leads to the fact that at the time of a sharp pressure on the gas, there is a wide opening of the throttle, the sensor of the flap sends the signal to. The electronic control unit under reduced pressure is not capable of quickly ensuring the supply in due volume, as a result of which the machine begins to pull on the go.

The engine can also work unstable and twitch on the go in the event that there are problems in. In addition to the jerks, there is a loss of power, increased consumption, etc.

An independent check involves the diagnosis of power wires, spark plugs, ignition coils, DPRV. To detect a possible reason, it is necessary to turn off the ignition, after which the reliability of the attachment of high-voltage wires on the coil and candlelight is checked. Next, the motor is launched and its work is estimated for hearing. Special attention should be paid to peculiar "cracklers", which may arise as a result of the fact that the spark breaks into some kind of site.

Then the ignition candles are filled to examine their status. The destruction of the insulator and other defects on the candle hull, as well as the erosion of the electrodes are not allowed. You should also pay attention to the Nagar, which may be present at the candlelight.

Such a nagar is removed mechanically with the help of a rigid brush. If the machine does not stop twitch after cleaning or replacing the candles, then it will not be superfluous to check the camshaft position sensor by a multimeter.

Other reasons

Other possible reasons that can cause jerking machines when driving, it is necessary to highlight possible problems with the clutch on the "mechanics" and malfunction of automatic transmissions.

As for mechanical transmissions, jerks can occur after the transition to a certain transmission at the moment when the driver begins to let the clutch pedal. In this case, it is worth starting with checking the condition of the basket, the clutch disk, release bearing, etc.

If the machine with a "machine" moves with jerks or twitching during acceleration, then it is necessary to diagnose the gearbox, check the level of transmission oil and the performance of the control electronics.

Finally, we add that noticeable jerks when braking with some drivers are mistaken for failures in the work of the engine. In fact, a frequent cause of such a car behavior may be worn brake discs.

Read also

With a sharp press on the gas pedal, the engine twitches, jerks and failures appeared, the car does not gain speed: the main causes of malfunction and diagnosis.

How did you think about it?

I did not come up with technology. I am just the owner of the author's license. And I bring the technology to mind.

How long have you been doing this?

Tenth year Professionally improving car characteristics using mechanical refinement. I do not deceive anyone and I do not run away from anyone. To deceive people is not my specialization, and deceive, yourself more expensive. I give a guarantee for your work. The described changes in cars are recorded by customers.

What auto make a choke refinement is done?

The refinement of the throttle is made on gasoline (injection, carburetor) engines. Diesel engines use other technologies.

How much will the engine power increase after refinement of the throttle?

Maximum power The engine produces 4000-7000 rpm on high revs depending on the engine. It is this indicator that you have registered in the documents. On small and medium turnover, the engine does not produce maximum power. With the help of this technology, I increase the power on small speed and partially on medium turnover. And this indicator does not affect the maximum engine power. Therefore, the horses remain, and the thrust on small revolutions increases.

How can choke reflect on the engine resource?

Positively! The smaller the fuel is burned, the smaller the patches and the piston rings are formed. The absence of nagar does not pull other constructive problems with the engine. As well as the resource of the car catalyst is extended if it is still. Because not burned gasoline does not guess in the catalyst. After improving the choke, you start ride with smaller speed. Less revolutions reduces the wear of the driving parts of the engine. Thus, the engine is engaged in the engine.

Why manufacturers do not immediately make choke refinement?

And why does the manufacturers immediately do what the market is to improve the car?!

First, the technology is young. Secondly, the manufacturer puts in a car what the market offers. The lion's market share is occupied by Bosch. Therefore, this refinement should do Bosch. Thirdly, there is information that this technology bought Toyota and BMW. It is possible that this refinement will already be on new models of these manufacturers.

Here is such a Chinese car repaired to our car service:

The client has such claims:
- the car is badly pulling
- when moving the motor "Clause"

Primary diagnostics revealed errors on the exhaust gas surge system. Maybe? And what, it seems ... and therefore EGR has been programmatically disabled and physically dismantled, put a reliable plugs:

"These plugs make my father, he has a lot of experience."

And they decided to test the car: together with the client, they made a test trip. We drove a little, looked at the client, they say, well, like. He thought a little and decided to please us:
- Yes, it seems better ...
We still drove, the client thought and shook his head:
- Better just a little bit, almost imperceptibly.

Indeed, with this trip, noticed that the engine "smoke black". In theory, it should be: with a dynamic acceleration of the exhaust pipe, there should be a "spit black", and then the car should accelerate without any black smoke. And we turned out differently: and with weak acceleration, and with a dynamic - from the exhaust pipe, the shadow smoke from the neighboring rocker.

Well, a negative result is also a result that pushes to continue searching for a fault. I want to say that in the autodiagnosis an instant solution of the problem is possible either in the cinema, or with a very successful circumstance, or if the problem has already been studied on such cars and remains only fun to climb fingers and get money from the client for work.

The sad client went home, and we continued to deal with the problem.

Thought that "if we have black in the exhaust, then you need to check the fuel system?".

Hang plums on the nozzles (on the "return"), began to check. And here they saw that one of the nozzles merges the fuel almost twice as much as the rest. Well, we can assume that one "jamb" found and approached its permission.

The new nozzle brought by the client decided one of the problems: the engine stopped ringing and began to work much softer. However, "smoke black" did not stop. The problem was completely not left, although they connected the "MotorTeter for the proper engine of the engine", viewed the data by the scanner again, in short, they did everything - except, probably did not dance with the tambourine. But nothing helped get closer to solving the problem.

And here I remembered the golden rule of automotive diagnostics, which I did not fulfill, probably, considered himself a genius of the car repair: "Talk to the client in detail and thoroughly."

I call, I ask about that "what did you do with the car in front of our car service, maybe there were some repairs, maybe there were accidents or something else?".
"The car was in a sudden car service where the timing belt was changing," the client said.
- And from this place in more detail, - and the heard information was a real fear of ears, the puzzle began to develop!

And that was what was "before": the client decided to change the timing belt. Found a car service (I wonder how he was looking for him? According to the principle "cheaper and quickly" or "a little more expensive, but reliable"?), Left there a car.

After some time, the locksmith was called and said that "Timpered we installed you, everything is clear there, but the car stopped starting," as if hinting that they are well done, and to blame for all the car.
- I came my move that you scratch me! Will!
Well, OK, silence for some time, and then again the call from the locksters:
- All the nozzles are clogged!
The client was very surprised. But as it turned out, it was not yet all the news, then sounded:
- And on the car there are problems with TNVD!

A competent person will immediately understand that the diagnosis of locksters could not be true, but most likely, is the so-called "excommunication", which often arises due to lack of knowledge and applub size with a balloon.

Further as in the cheap novel: "Two weeks have passed ...". All these days a locksmith could not start the engine, but, probably, they tried very much. And most likely, they attracted some specialist from the side and strongly prayed: a car, though Chinese, but the cost of him is not two kopecks, and the client was very determined, and with unsuccessful repair could reach the court.

Then everything was too like in the movies: "And then a miracle happened" - Motor launched! The client called the client, was invited to the celebration, the result was demonstrated: the car started and the engine worked.
- Why is the smoke goes white? - the client asked suspiciously and heard an argued answer in response:
- So we launched it from the ether ... so it should be. Nothing terrible: Ride kilometer-two, and the smoke will disappear! Believe our experience: Everything will be fine!

And indeed: smoke disappeared. But only not through a kilometer or two, and two days later. Colleagues, reading it, too, smile: "There can be no such that at the start of the ether the engine smoked two more days."

Well, then the client believed that everything was fine with the car, they repaired it high quality and decided on a trip to the south, toward the warm sea. On the way, the car began to slowly die, rushed more slowly and slower, creaked and twitched until he got up at all.

Here with such a real history, this car was in our car service. Therefore, I will say again and yourself, and the rest: "Pass the client with special cynicism, recognize the entire history of the life of the car, let him say all the things, even if they are insignificant for him!".

If someone thinks car diagnost, it is only such a job:

And that it is only worth it in the scanner, voice read from the screen and get money from the client is a fatal error!

Avtodiagnoste is a silent conversation of a person with iron, approximately such:

Autodiagnoste in white gloves is only in the cinema or on another planet in the parallel world. In fact, everything happens differently, since auto-diagnostics is not a voicing of the error number from the scanner screen, this is a whole complex of work, including plumbing, and everything for finding, understanding, to see a malfunction - and elegantly eliminate it !

Therefore, I had to delve into the mechanics. In the photo below the motor is already assembled, it remains only to put new nozzles:

And before that, I had to do the work of the mechanic-locksmith: to remove the protective covers, inspect the labels and the rest ... and that it was discovered: "The labels were in the labels" - already well. The timing was assembled correctly - already better. But all spoil the "nuance": the pulley was dressed "back-up". They, previous locksmith, it was still possible! But probably it was not easy to do this: the pulley was so stubbornly "tully-stretched-inserted" that he could not stand such a jumped circulation and indignantly cracked.

Now I will expose and confirm my words, watch the photo below, does not catch anything?

If nothing is unusual, then the next photo, here already signed a sentence:

Well, the most unpleasant for the client: the crack.

It is difficult to notice the photo, but I will tell you: "The crack tried to smell mud and rust." No matter how much pulley is still known to God, with whom, to my great regret, I have no opportunity to contact me, but I would like to: suspicion remained a locksmith from the previous car service at all in large: when I put the timing belt, then and bent the valve. And it is necessary to replace a lot of time - here they came up with excuses that nozzles and the pump are faulty, and everything must be fixed-reread and restore.

And on the nozzles there are great suspicions: they were most likely workers at the time of the client's arrival to replace the timing, and died after the intervention of those specialists. But we have a friend: Gzhel's city, call Sergey. How many cooperating with him - never let down. He looked, checked and made a conclusion, sad for the owner of the car: "fans of the dead." It is asked: what was the first locksmaker of the previous car service rushed to repair good nozzles with their subsequent guaranteed murder?

It is necessary to be seven spans in the forehead to repair good nozzles from Delphi! As far as the public is known, these nozzles can repair only exceptional people, gifted by experience and appropriate equipment, and such, unfortunately, even now in the 21st century there are extremely few. So "got" our client on a very impressive amount.

In the photo below, three nozzles (one was previously purchased by the client):

Their cost is comparable with carefree rest in Turkey. And for money spent on repairs, the client could fly to Canary and admire the beautiful sunset.

Malfunctions and disorders in the operation of the engine can be manifested in different ways, starting with suspicious sounds that are coming from under the hood, with leaks that remain on the asphalt after a long parking, ending with the jerks while driving.

Rods during the movement of the car They may occur no matter how you press the gas pedal, this occurs as a result of a short-term change in the rotational speed of the crankshaft. The failures may occur not only during overclocking, but also when the gas is discharged, as well as with the constant movement and the same position of the gas pedal. In order to understand why car jested when driving It is best to contact the specialists for a hundred, since, most likely, the injection systems will also have to produce, and for this, as you understand, you need to have special equipment. In most cases, the jerks occur during the ride due to disruption of the pressure in the fuel ramp, or as a result of a malfunction of the throttle position sensor (DPDZ).

The car twitches while driving - reasons

Sometimes during the start of movement, when you touch, there is a "failure", while the newcomers often even can even stall the motor. This effect occurs exactly at the moment when the throttle is opened when the engine switches with idle speed into the load mode. In modern engines, the motor helps the driver, for the smoothness of the ECU, receiving a signal with DPDZ on the position of the throttle will increase the fuel supply. However, if the pressure in the fuel ramp is weak, the fuel will still not be enough.

Cause of jerks while driving It can also be conclusted in the electromechanical part of the throttle or. The reason for such pollution is also often caused by a lack of pressure in the fuel ramp. When you dramatically press the gas pedal, in order to instantly accelerate, it opens very widely, with the ECU, accepting a signal with the DPDZ about the position of the flap, without having the right pressure, is simply not capable of providing the engine with the required amount of fuel.

In cars with automatic transmission, the car twitches when overclocking Due to the faulty gearbox or, for example, due to too low oil levels in it. Sometimes "jokes" with a box can occur after the acb is turned off immediately before the trip, such a phenomenon is "not deadly" and as practice shows, it goes by itself, after several accelerations.

Often, the reasons are completely trivial, for example: the mesh of the fuel pump is scored, etc. But I think that you like most of us - the first thing they checked it, if not, then do it.

The car twitches on the go - reasons

As a rule, such jerks occur due to the failure of the ignition system. However, if the trouble occurred on the road, you can try to easily remove the breakdown. For this we do the following:

• Turn off the ignition, lift the hood and make sure that all high-voltage wires are securely fixed on the coil and candles.
• Then get the engine and listen to the engine, listen, are there no extraneous crackles or clicks. The point is to test if there is no "breakdowns for mass", that is, if the spark is still somewhere except the candle. It is best that it is checked in the dark, then you will not only hear the crackle, but also you will see how it beats, for example, on the body or else somewhere.