The car jerks while driving: we find and eliminate the cause
Almost every driver has encountered such an unpleasant situation when the car began to twitch during acceleration, at low speed, or even at the very beginning of movement. Experienced car enthusiasts say with confidence that such a problem can happen to any car, regardless of age and make. Jerks in motion can be observed both in the Chevrolet Niva and in any other car. If your car begins to jerk while driving, it is recommended to find the cause as quickly as possible and eliminate it in time.
Often, every driver can eliminate such an ailment without the help of specialists at a service station. Ignoring the problem can not only aggravate the situation, which will subsequently require expensive repairs, but also jerking the vehicle often leads to an accident. A faulty car is unable to start a smooth ride and then accelerate. A jerking vehicle not only instills fear and terror on other road users, but also knocks them out of the way. Next, let's try to figure out what can cause the uneven running of the car.
Air leaks and sensors
As you know, the injection engine is equipped with an electronic engine control system (ECM), which completely controls the operation of the power unit. This system is actually multiple sensors and a controller (ECU). Based on sensor readings, the control unit adjusts the SOP, increases or decreases the amount of fuel supplied, prepares a fuel-air mixture that will be optimal for a particular engine operating mode, etc.
If the signal is incorrect, then fuel supply may not be implemented correctly. In this case, a failure appears, which the driver feels in the form of a delay in pressing the gas, that is, a failure. Note that such failures are especially relevant on those cars with an “electronic” gas pedal. In other words, there is no direct connection to the throttle body.
Let us also add that the throttle valve must be cleaned periodically, and also on many cars it is necessary to carry out the procedure for adapting the throttle valve after cleaning this element. To avoid problems, experienced drivers clean the throttle valve at least once a year. This procedure is performed for preventive purposes.
In garage conditions, when there is no diagnostic equipment, checking electronic sensors is carried out by elimination; a multimeter tester is used for diagnostics.
- As for air leaks, this phenomenon may well lead to jerks and failures during acceleration. If excess air is sucked in somewhere, then the ECU loses the ability to correctly determine the amount of air entering the engine.
As a result, the mixture of fuel and air will be prepared incorrectly; instead of a power-rich “rich” mixture, a lean working mixture will be supplied to the cylinders. The suction may occur at the intake, and problems in the fuel supply system are also possible. In any case, depressurization requires immediate detection of the problem area.
The car is shaking, what should I do?
At the first stage, the machine is diagnosed. Let's say that you have a VAZ 2106 with a carburetor engine in your garage. Your car already shows signs of “illness” at the first stage of movement. Or the car started moving without any hassle, but when a certain number of revolutions was reached, the engine malfunctioned. All this will not give answers, but only creates questions, because anything can break. In any case, if unstable operation of the car’s power unit is noticed while pressing the accelerator pedal, the first thing you should do is:
- Check air and fuel filters. The supply of air and fuel to form a combustible mixture will be difficult if these elements are heavily contaminated.
- Check the fuel pump. Its incorrect operation leads to unstable fuel supply.
- Check fuel pressure. The supply of the fuel-air mixture under insufficient pressure often leads to jerking of the car. The pressure when the engine is running should not exceed 3 kgf/cm2.
Most of the reasons lie in the car's fuel system. But you shouldn’t write off the ignition system, and sometimes even the transmission can cause discomfort while driving. There can be many reasons. To narrow your suspicions, measure the conditions during which the car begins to act up. To do this, while driving, watch the instrument panel and remember at what moment the uniform movement stopped. Do this several times to confirm that your observation is correct.
“Failure” when pressing the gas pedal
A failure is a sudden interruption in the operation of a car engine. A common problem.
It can occur in different operating modes when you press the gas pedal. Accompanied by a drop in vehicle acceleration and even stopping. Possible - short failure (2-3 seconds), deep failure (3-10 seconds), jerk (1-2 seconds), twitching (series of jerks), rocking (series of failures).
This article discusses ways to independently eliminate the failure when pressing the gas pedal in the operation of a warm engine of VAZ 2101, 2102, 2103, 2104, 2105, 2106, 2107 - “Classic”, 2108, 21081, 21083, 2109, 21091, 21093 , 21099 - Samara-1 family, 2121, 21213 - Niva, 1111, 1113 - Oka, 2140, 2141 - Moskvich, GAZ Volga, etc., associated with one or another malfunction installed on them carburetors 2105, 2107 Ozone, 2108, 21081, 21083 Solex and their modifications.
And also the main reasons for its appearance are given.
Signs and causes of “failure” when pressing the gas pedal on a carburetor engine
All causes of “failure” are based on either over-leaning or over-riching of the fuel mixture entering the engine cylinders when the gas is pressed. As a result of such a violation, the engine either does not receive the required amount of fuel and operates with failures, or it is simply flooded with fuel with a similar result.
This should be taken as a starting point when diagnosing this malfunction.
An over-lean fuel mixture is caused by a decrease in fuel supply through the carburetor due to clogging of its jets and channels, “suction” of foreign air, gasoline leakage, and low level in the float chamber.
An over-enrichment of the fuel mixture is caused by a violation of the adjustment of the position of the carburetor flaps, or the leakage of the needle valve, connections and seals.
For example, if there is a “failure” (1-2 seconds) when you smoothly press the gas pedal when starting off or idling. Subsequent acceleration and dynamics, as well as idle speed are normal.
The reasons for this particular malfunction are that the outlet holes of the transition system of the first carburetor chamber are clogged and (or) the carburetor accelerator pump is faulty.
In detail about the signs and causes of failure in the operation of a carburetor engine of a car: “Signs and causes of failure in the operation of a carburetor engine of a car.”
Methods for eliminating failures in the operation of a carburetor engine when pressing the gas pedal
Checking the condition of the fuel filter at the inlet to the carburetor
A dirty and clogged filter makes it difficult for fuel to enter the carburetor float chamber, which leads to a decrease in its level, a leaner fuel mixture at different engine operating modes and, as a result, failures due to loss of power. Contamination of the strainer occurs due to clogging and corrosion of the fuel tank and fuel lines, and the use of low-quality fuel.
We remove the fuel filter of the Solex 21083 carburetor for cleaning
Cleaning the fuel filter on carburetors 2108, 21081, 21083 Solex and 2105, 2107 Ozone is almost identical. Unscrew the filter plug with an open-end or spanner wrench (2108 Solex – key to “13”, 2105, 2107 Ozone – key to “17”). Carefully remove it. Remove the mesh filter inserted into it. Clean it thoroughly (for example, with a toothbrush soaked in acetone), blow it with compressed air from a car pump and put it back. Also clean the filter hole in the carburetor.
We eliminate jerks when the car starts moving
According to the number of reviews from owners of VAZ 2106 with a carburetor engine, it is the engine power system that most often poses a problem. Due to the breakdown of absolutely any element of the system, the stable process of fuel combustion in the cylinders can be disrupted. If an insufficient amount of mixture enters the cylinders, then the car in such conditions will not be able to produce the required power. Against the background of this problem, twitching will begin to appear.
Check the pipes, determine if there is any depressurization of the system. Measure the fuel pressure. If the indicator does not correspond to the norm, then further search for the cause should be sought in the pressure regulator, fuel pump. These actions must be performed not only with the carburetor system, but also with the injection system. If an injector is installed on a VAZ 2106, then in this version the ignition system is also connected. The cause of the car jerking can be absolutely any sensor that has failed. Perhaps in this case you will need the help of specialists, because all the work is complicated by the presence of an electronic unit.
The cause of a stalled engine is a power supply failure
In this type of problem, 3 reasons may be involved:
- Poor contact with the terminals of the new battery;
- Detection of poor contact or breakdown along the entire length of high-voltage wires;
- The appearance of malfunctions in the generator or ignition coil system of the car.
If the problem lies in damp high-voltage wires, then it is best to replace them completely along with the battery contacts. If the terminals make poor contact, you need to carefully clean them with sandpaper and try to reconnect them. If the generator is found to be inoperable, the problem usually boils down to problems in the following parts:
- Broken timing belt;
- There is a malfunction inside the housing of the unit itself.
A problem with the generator is easily detected when the corresponding indicator on the dashboard turns on. In addition, if there is insufficient energy supply, the backlight of the on-board panel will gradually fade, and a set of other diagnostic sensors will show incorrect values.
Advice: if when you press the gas the car jerks, then stalls and cannot start, then the problem is related to the failure of the ignition coils. It is best to replace these parts in a car service using special equipment.
From the list of reasons that are directly related to the car engine, you need to move on to problems that arise in the fuel and air supply systems, as well as malfunctions of components responsible for exhaust gas removal.
Eliminate jerking when accelerating a car
If the VAZ 2106 begins to twitch when accelerating, then in this case it is necessary to carefully check the engine power system. The driver presses the speed pedal while driving, but the vehicle does not accelerate. By pressing the accelerator pedal, the driver provokes an increase in the amount of fuel mixture supplied to the cylinders. If this does not happen, breakdowns occur in a uniform manner.
We check all filters: fuel, air. A carburetor engine has 2-3 filters. We will not take into account the mesh in the neck, since it can only prevent the penetration of large particles. You should carefully check the filter that goes to the fuel pump. Often it becomes clogged with impurities, which ultimately prevents the free flow of fuel, causing the engine to starve.
Malfunctions in the air mixture supply system
Here the problem lies either in a clogged air filter or in the failure of the regulator responsible for idling the car. In this case, your car will stall all the time when you gain speed or when you release the gas when you release the accelerator.
To solve the problem, remove and inspect the air filter. If there is serious contamination or chips, replace it. To diagnose and replace the idle speed regulator, you will need the help of qualified car service employees.
Eliminate jerking when the car is moving steadily
If a Chevrolet VAZ 2106 exhibits twitching during stable movement, this most often happens due to problems with the ignition system. You can often hear car owners complaining that they just installed new spark plugs, but the engine has already failed. Detonation can occur even with new spark plugs due to incompatibility with the engine. If the spark plug fails, then the fuel will not burn completely, and breakdowns will begin in the operation of the power unit.
Checking the spark plugs is quite easy. The first thing you need to do is:
- Check the level of gaps on the unscrewed spark plugs. Check for any irregularities in the sparking process.
- A working spark plug produces a dark blue spark.
- If there is black carbon on the spark plug, then the problem may lie in a faulty ignition or faulty mixture formation.
If checking the spark plugs does not bring any results, you should check all wiring for oxidation and breakdowns. Don't forget about the coil and toggle switch. All elements of the ignition system, as in the case of a problem in the power system, are thoroughly inspected and checked for correct operation.
Jerks at low speeds on gas
#1 life22
- Users
- 4 messages
- Registration 22-July 14
- Top
- Complaint
Hello. It seems that I didn’t find anything in the topics, so I’m waiting for competent advice from you, dear forum users. The problem is as follows: when the car is cold or hot, it starts jerking on the gas at low speeds (range 1500-2500 thousand), the “jerking” started relatively recently, it has 2nd generation propane gas, BSZ SOATE, NGK-2 spark plugs , TESLA wires. I installed HBO not long ago, about 15 thousand ago. What was done: I cleaned the BSZ contacts, cleaned the spark plugs (I changed them along with the installation of the HBO) I removed the distributor cover on the contacts of all the cylinders, there was significant black carbon deposits, I cleaned it, the slider also turned black, the problem seemed to go away in one evening, the same thing in the morning. I cleaned the gas filter and thought it was the problem, but it didn’t help either. I'm thinking about changing the high-voltage wires, the distributor cap and the ignition distributor slider.
Added after 2 minutes I would like your advice in order to protect myself from unnecessary financial expenses)
#2 Creative4eg
- From: Kyiv
- Car: VAZ 21063i
Your time is limited! So don't waste it on someone else's life! (Steve Jobs) “a corrupt gang that replicates stickers for traitors to the classics” (c) Zir
- Top
- Complaint
#3 life22
- Top
- Complaint
#4 zootechnik
- From: Poltava
- Car: VAZ-21011(21013)
it looks like a felt tablet
- Top
- Complaint
#5 Creative4eg
- From: Kyiv
- Car: VAZ 21063i
It’s better to go to the HBO specialists, they will adjust it for 10-20 UAH, the settings may have gone wrong, according to the symptoms the gearbox is poor
Your time is limited! So don't waste it on someone else's life! (Steve Jobs) “a corrupt gang that replicates stickers for traitors to the classics” (c) Zir
- Top
- Complaint
