If you are the owner of a new or used VAZ car, then most likely you have encountered problems that the car does not hold speed at idle and stalls. The starter can work absolutely normally. However, there are difficulties when the ignition is turned on. But, even if these problems were temporary, it is still necessary to find the cause. And it is advisable to do this faster.
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MAIN REASONS WHEN THE CAR STALLS AT IDLE SPEED
A VAZ car stalls at idle quite often when there is a malfunction of sensors, components or parts. It is also possible that the car's lines, filters, and various elements in the system become contaminated.
If any of the VAZ models, including the Chevrolet Niva, stalls at idle, then first of all you should pay close attention to the quality of gasoline. Problems with starting or incorrect operation of the engine after the next refueling may arise precisely because of low-quality fuel. In this case, it is worth draining all the gasoline and changing the fuel filter.
When these steps do not help, you need to check the spark plugs in the car. The working part is distinguished by the light gray color of the central electrode. The carbon deposits on the candles should be light brown. In case of any deviations from the norm, we can assume that the part has failed. Replace the spark plugs and try to start the engine again.
A faulty ignition module can also cause problems with starting the engine. Knowledge of at least a minimum of electrical engineering will allow you to check its performance. But it is better to contact a specialized service.
A generator malfunction leads to a decrease in the bot network voltage. In this case, all vehicle systems are powered by the battery. This is also the reason why a car stalls at idle when hot. On the instrument panel indicators of some models you can see a decrease in the mains voltage. Here it is worth diagnosing the generator for the presence of a breakdown.
What are the reasons leading to incorrect engine operation:
- The throttle valve is broken or dirty.
- Contamination in the crankcase ventilation.
- Malfunction of the throttle position sensor or mass fuel flow sensor, other indicators.
- Faulty or clogged parts of the idle air regulator.
- Carburetor channels are clogged with sediment.
- Fuel nozzle clogged.
- Debris or errors in the operation of injection nozzles.
- Faulty or dirty fuel pump filter mesh.
- Fuel filter is dirty.
Is it worth it to blame the carburetor?
The car may stall at idle due to problems with the carburetor If you have a carburetor engine, then 9 out of 10, the car stalls at idle precisely because of problems with the carburetor. The simplest option is that it is clogged. In part, this is a very simple and reliable element, but it needs to be cleaned constantly.
Any speck that has leaked through the filter system can seriously ruin the operation of the engine and raise many questions not only in the mind of an amateur, but also among service station specialists.
It is recommended to wash the carburetor in special solvents, which are easy to purchase at auto supply stores. The aforementioned aerosol cleaner will also come to the rescue.
OPTIONS FOR TROUBLESHOOTING
It is clear that if any emergency situations arise with the motor, it is advisable to contact a specialized service. However, this procedure is not always possible. Therefore, it is worth knowing how to independently diagnose the main systems and key parts.
THROTTLE VALVE AND ASSEMBLY
When the speed drops at idle and the car stalls, you need to pay close attention to the details of the throttle assembly. Long-term operation of the car on low-quality fuel and untimely maintenance of the air filter can lead to malfunctions of the throttle valve. It periodically jams if debris gets into the equipment.
Throttle valve VAZ 2112
The problem can be solved by cleaning the system. The throttle is cleaned using carburetor cleaners. Using a compressor, you need to blow out the damper under the pressure of compressed air. It is not recommended to touch the screws located inside and on the side. If cleaning does not correct the situation, the device must be replaced. This operation is not particularly difficult.
CRANKCASE FAILURE
There is an oil trap in the crankcase ventilation system of the engine. Its contamination can also lead to interruptions in engine operation. Crankcase gases do not allow the engine to function normally, the speed fluctuates, the internal combustion engine stalls.
SENSORS
If a gasoline car stalls at idle, then one of the sensors is likely to break. In injection cars with an electronic engine control system, the engine usually starts normally, but then it stops working. It's worth checking here:
- Electronic car indicators;
- DRХХ – device that regulates idle speed;
- Air flow meter (air intake in the carburetor);
- Sensor indicating the position of the throttle curtain.
Electronic control unit in VAZ 2114
Interruptions in the operation of any sensors immediately affect the behavior of the electronics - errors appear in the car control unit. The “brains” of the machine receive unreliable information. It is not transmitted correctly to the engine. It starts working with parameters that do not correspond to reality. Self-testing of this device is not possible. You need to contact a professional for service.
Diagnostics of mass air flow sensor
The idle air control device is usually to blame for engine malfunction when the car idles poorly. But you pressed the gas pedal and the engine started. In the latest VAZ modifications, error information appears on the instrument panel.
When diagnosing, you must use a multimeter. If a part is faulty, it is recommended to replace it with a new one. All sensors are reasonably priced. It is better to start checking with parts that have a simpler design. Then gradually move on to complex devices. We must not forget that the problem may lie not only in the sensors themselves. It is also necessary to check the wiring to them and the presence of stable contact.
CARBURETOR
If the VAZ carburetor stalls at idle speed, then the jets may become clogged. Low-quality gasoline, deposits from the gas tank, contain small particles of debris. They can easily disrupt the operation of the fuel injection system. It is worth replacing the filter in front of the carburetor and cleaning the device itself. The dispensing part is cleaned using a cleaning solvent, which is sold in aerosol cans. Another reason is often a prolonged lack of carburetor adjustment.
In a mechanical fuel pump of carburetor cars, the filter mesh may be clogged with dirt. This reduces the performance of the device. Wear of the membrane and its destruction often leads to clogged carburetor channels.
INJECTOR
A situation that often arises is that various Lada models, as well as the VAZ 2110 injector stalls at idle. It is necessary to check the fuel pump strainer for clogging. This is a common problem with injection machines. It is better to immediately replace the part with a working one.
FILTERS PROBLEM
If the VAZ 2112 stalls at idle, then the fuel filter may be dirty. This also applies to other models of the concern. Generally, it is not practical to clean it. The part must be replaced. The same should be done with a dirty air filter. Low throughput leads to the fact that the air-fuel mixture simply floods the spark plugs.
Self-checking will not always lead to a positive result. It is often more practical to identify the cause of unstable operation of the internal combustion engine at a car service center. It will cost more, but specialized diagnostics will prevent more serious damage to the car.
INDEPENDENT DIAGNOSTICS IN THE GARAGE
If you have problems with the operation of the injection system, you should first diagnose the ECU. In this regard, the owners of the VAZ 2114 are more fortunate with the German VDO instrumentation - it has a self-diagnosis mode. On cars with a dashboard from Schetmash there is no such functionality.
VDO dashboard for VAZ 2114
Working with the self-diagnosis mode on the VDO panel is carried out according to the following algorithm:
- With the ignition off, hold the odometer button for several seconds;
- turn the ignition to position “1”, release the button;
- if the arrows start running on the display, everything is fine, press once (information message about the firmware version) and release, with a second press an error code will appear;
- You can reset the error by holding the button until “0” appears.
Injection problems that cause the car to stall can be indicated by the numbers 1 (ECU error), 14,15 (coolant sensor errors), 22, 23 (DPS errors), 33, 34 (MAF errors), 42 (ignition malfunction) , 44, 45 (lean or rich mixture). The disadvantage of self-diagnosis on the VAZ 2114 is that if there are several errors, the system sums up the codes. Thus, the number “22” may mean a TPS error or low on-board voltage and a coolant sensor error (8 + 14).
For more accurate diagnostics of the injector, you need to immediately contact a service center or purchase a diagnostic scanner (it costs about 1000 rubles).
If you have another car, you can find the problematic sensor by replacing the sensitive elements one by one with known good ones.
VAZ 2115 stalls at idle - reason
- Wash the throttle assembly, especially pay attention to the channels xx, where the low speed regulator is located. Wash the IAC itself. Check the TPS sensor. Look for air leaks, check the mass air flow sensor. Check coolant temperature sensor.
- I once changed about five TPS, from the cheapest to the most expensive, and everyone behaved differently. They have a little travel to adjust, try making the revs a little higher.
- Well, suction cannot be ruled out throughout the entire intake tract. Do you have a recirculation valve? The tube comes to it from the receiver, try turning it off.
- With a non-working automatic transmission, the car will not start at all, much less go anywhere. Moreover, the ECU constantly monitors its operation and, if something happens, will turn on the meat grinder on the panel for you.
- According to check: when the ignition is on, there should be 0.7 volts between ground and the TPS slider, and 4 volts with the throttle fully open.
- I don’t know whether there are many or few defects, but I came across two in a row through which air was sucked in the place where the rivets were, both with a hologram and with an authentication code. I returned one, the second, because I took it apart, naturally did not return it, but covered the crack with nail polish.
- But you may have another reason; I haven’t tried it with the connector removed. Just in case, check it for leaks.
- No, there is no relay, there is a stepper motor, controlled by the ECU.
- The ECU issues control signals to the stepper motor, in which direction and how many steps to turn the motor rotor, and it, in turn, moves the rod, opening or closing the xx channel. Operating a ball motor is not like operating a regular motor. Or do you think that the ECU may not be giving a signal? Then you need to diagnose or borrow a BC, it will be able to show the operation of the IAC.
In this article we will talk about such an unpleasant problem as engine stopping and poor starting. Let's look at the main reasons why the engine stalls at idle and while driving. In addition, we will talk about why the engine does not start when hot, as well as options for solving each of the problems described above.
Diagnostic features
It is worth considering that there are no exact sequential actions by performing which it will be possible to accurately determine the cause of the malfunction. If the power unit stalls only occasionally, then the situation may not be that serious. There is a chance that this is how the vehicle simply reacts to severe frosts. However, if you have recurring problems, you should contact a specialist.
It is best if the mechanic connects a specialized diagnostic device to the car at a car service center. He will determine exactly where the breakdown occurred and which element should be replaced. Of course, if the car owner has enough knowledge, he can identify the problem on his own. But you need to understand that if such a diagnosis was performed incorrectly, this can lead to more serious consequences. In this case, the final repair of the car will be much more expensive. Therefore, you should think several times before saving.
Common reasons why the idle stalls:
1. The most common one is the idle speed regulator (sensor), which is directly related to engine idle speed. It’s quite easy to check whether there is a breakdown. If the car does not start when you turn the starter, operate the gas pedal, the engine should start. If the revs start to fluctuate immediately after you take your foot off the pedal, there is a 99% chance that the reason is in the idle speed control. The solution is to replace the idle air control; this will take VAZ owners a minimum of time.
2. The second probable reason why the engine stalls at idle is problems with the throttle valve. This problem can be cured by simply cleaning the throttle valve.
3. If after cleaning the problem persists, we assume that the reason why the engine stalls at idle may be the TPS (throttle position sensor). The problem is solved by replacing the TPS; the procedure is not complicated and can actually be done with your own hands.
There are often cases when the engine stalls while driving, as they say, out of the blue. The most probable and most common reasons why this may happen will be listed below.
If the engine stalls at first, but then starts
Incorrect firmware of the electronic engine control unit may prevent the car from idling correctly. Incorrect firmware of the electronic engine control unit may prevent the car from idling correctly. This happens when a vehicle is subjected to unreasonable tuning. As a result, the car can produce decent dynamics at high speeds, but it can no longer hold 1000 rpm and stalls.
This problem is solved by flashing the ECU in accordance with the factory version of the program.
But most often, such troubles still arise due to the unstable operation of certain sensors. First of all, this is a mass air flow sensor (MAF), as well as a throttle position sensor (TPS). It is also necessary to mention the idle speed controller (IAC), which is popularly called the “idle speed sensor”. All these elements require regular diagnostic testing. In case of emergency, it is convenient to have a spare set of the listed sensors, especially since their cost for almost all brands of cars is low.
The engine stops while running - reasons
1. Poor quality fuel is the first thing that comes to mind for most of us, and besides, this is where we need to start looking for the reason for the engine stopping while driving. You will be “lucky” if this happens immediately after refueling, in which case you can confidently say that the problem is in the fuel. Treated by draining the fuel and replacing the fuel filter.
2. Candles. As a rule, suspicion most often falls on them, after bad fuel, of course. Everything is simple here - unscrew the spark plugs and check their condition, replace the spark plugs if necessary.
3. Fuel filter. A seriously clogged filter can cause an interruption in fuel supply, causing you to rev the gas and the engine to stall while driving. To eliminate the problem, simply replace the fuel filter.
4. Air filter. Everything is the same as with the fuel, if it is clogged, then no air comes in, therefore the fuel-air mixture comes out over-enriched and the spark plugs simply flood. In addition, due to lack of air, the engine will choke, that is, the power will drop, and the combustion process of the mixture in the cylinders will not be able to take place, and eventually the engine will stall. To eliminate this problem, simply replace the air filter.
5. A faulty fuel pump is the second “suspect.” If your fuel pump is not working properly, then the car will behave like this, stalling while driving, or the engine will not start at all. The problem can be solved by checking the pump, repairing it, or completely replacing the fuel pump.
6. Battery. Oxidation of the battery terminals or poor contact can cause the engine to stall. Check the terminals, clean them if necessary or replace the battery.
7. If the engine stalls while driving and no longer starts, the generator may also be the cause. A failed generator does not charge; as a result, the car’s on-board network is powered exclusively by the battery, and as we know, it will not last long. As a result, you, unaware that the car is running on the battery, continue driving until it is completely discharged. It can be treated by charging the battery and repairing the generator.
Diagnostics of the mass air flow sensor
To check this sensor you will also need a multimeter, but it must be set to the “voltmeter” mode. We diagnose the air flow sensor as follows:
- De-energize the car by removing the battery terminals
- We measure the voltage between the contacts of the green and yellow wires
- Normal value - voltage ranges from 0.99 to 1.02 V
In some cases, simply cleaning the sensor or cleaning its oxidized contacts helps. But such actions do not always lead to the desired result. It is best to replace the mass air flow sensor with a new copy and forget about the problem, especially since this is an inexpensive mechanism.
Why does the engine stall when it is hot, and a well-warmed engine does not start?
1. The first possible reason is the carburetor. During movement, a large amount of air passes through it, due to which the carburetor is seriously cooled, at the same time the fuel that passes through it is also cooled. As a result, the carburetor temperature is several times lower than the engine temperature. Because of this feature, problems arise; after a long journey, you turn off the engine and make a short stop, at which time the carburetor begins to get very hot from the hot engine body. The remaining gasoline in the float chamber begins to evaporate from the high temperature, filling the voids - the air filter, the intake manifold and the carburetor itself. Air pockets form, and not a drop of fuel remains in the float chamber.
The solution to the problem is quite simple - press the gas pedal halfway several times and try to start the engine. This will make the mixture leaner and release excess evaporation. It should be noted that problems with hot starting can also be due to a similar problem, only due to the fault of the fuel pump or fuel line. This usually happens in hot weather when air pockets form from evaporation in the fuel system or pump, preventing fuel from entering the carburetor.
2. The second possible reason for the strange behavior of a warm engine is problems with the starter. Make sure that when you try to start the engine, the starter turns and does not just click or not respond at all. If this is the case and one of the above options is confirmed. the starter needs to be checked. If you are on the road, then the check can be reduced to a basic check of the starter power wire or other visual operations. If you get home, perform a detailed check of the starter according to these instructions. In case of malfunction, repair or replace it.
3. Alternatively, the reason when the engine does not start when hot may be a dead battery due to the reason described above, when the generator did not charge and the battery was completely dead.
Well, it seems like you didn’t miss anything!? That's all for today, we hope the article will help, tell you the cause of the breakdown and help you solve your problem. If you know other reasons, as well as ways to solve them, you can supplement the article using the comment form. Thank you for your attention.
Unstable operation of the carburetor engine
The nature of the unstable speed of the VAZ2107/2105 engine with carburetors is the same as that of an injection engine, in the uncontrolled supply of air or fuel into the combustion chamber.
But in this case, the carburetor is responsible for preparing the combustible mixture. This is a completely mechanical device that is responsible for the optimal ratio of fuel to oxygen for different operating modes of the power unit.
Despite the fact that there are filters at the fuel and air inlets, they may not work efficiently, usually due to a long service life exceeding that specified in the maintenance standards. As a result, the carburetor jets become clogged with small particles.
Drivers with great experience do not stand on ceremony, they throw the VAZ 2107/2105 carburetor into a bucket of gasoline for a day, then blow it out from all sides with compressed air and the carburetor seems to work normally. This solution is questionable if the carburetor is very dirty.
Among the causes of engine malfunctions that are caused by carburetor failure are:
- displacement of the position of the adjusting screws due to shock or vibration;
- increase in the diameter of the jet holes due to wear;
- wear of the damper axis, limiting its travel;
- clogging of jets;
- failure of the float seal.
To determine the malfunction of the VAZ 2107/2105 carburetor, and it will most likely be complex, start by checking the tightness of the float. To do this, remove it from the top carburetor cover (it needs to be removed). If there is gasoline in the float, throw away the float; if there is air, check in a bowl of water for bubbles. Let's say it passed the exam, then it is necessary to check the gap.
Lift the carburetor cover vertically. The gap between the float chamber and the carburetor wall should be 6.5 mm.
Install the carburetor cap and run the engine for 30 seconds. Remove the cover. The gasoline level should exactly coincide with the middle of the conical surface of the carburetor body. If this does not work, you should slightly bend the corner of the float rod.
Over time, air and fuel jets either become clogged or wear out. In the first case, they need to be cleaned and blown out. In the second case, you should check the throughput of the jets using a tank of water installed above the measured jet by 1 meter. They are connected by a tube. A volumetric flask is installed below. Measurements take place in units of cm3/min. Depending on the marking of the nozzle, the volume of liquid collected per minute in a volumetric flask should correspond.
It is much easier after 7-10 years of carburetor operation to buy a set of jets and replace them.
Those who use gas installations should know that a carburetor is not used when driving on gas. Over time, oxide forms inside dry jets, which clogs the fuel supply holes. A gasoline car may not start. It is recommended to use gasoline periodically.
The cause of a stalled engine is the spark plugs
In 50% of cases, the problem is due to the fact that the spark plugs simply do not produce a spark. This failure occurs as a result of 3 reasons:
- contacts become clogged;
- plaque forms along the entire contour of the candle;
- malfunction when supplying voltage to the spark plug.
However, the most popular is still black carbon deposits on the spark plugs, which prevents the spark from appearing or causes it to work periodically.
Tip: if the spark plug set malfunctions, you will hear a “triple” sound that is uncharacteristic of the engine. In this case, the car will jerk strongly while moving. As a result, the engine will either stall on its own, or you will need to turn it off and turn the ignition on again.
If you see dirt on the surface of the contacts, this indicates the need to replace a low-quality type of fuel or check the serviceability of the oil supply systems. It is the oil supply adjustment sensors that can splash the spark plugs with it if there is a problem. Also, oil that appears on a set of spark plugs may indicate serious damage to components in the engine cylinders. Be sure to check the engine at a car service center. Otherwise, further operation may lead to expensive replacement of jet rods and even the entire set of pistons.
If you systematically use low-quality gasoline samples, you may find a red-brown coating on the contour of the spark plug. In this case, cleaning will not help - it is better to immediately replace the entire set after a new refill. If you find that the car periodically turns off at full speed, but starts easily even with clean spark plugs, then the problem lies in the electrical wiring.
Air filter
If all the reasons described above do not apply, then you should pay attention to the filtration system. This unit also often leads to malfunctions.
On injection-type cars, filters are adjusted to an optimal and universal operating mode. This element is necessary in order to trap dust and dirt, but not impede the passage of clean air. Typically, small panel filters are installed in VAZs. They are considered more efficient and compact. However, cylindrical models are often installed in cars, which quite quickly cease to perform the task correctly. In this case, you will need a simple diagnosis of the VAZ 2114 car and replacement of the damaged element.
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.
Ignition coil
"Women's" reasons
This conditional category includes reasons that sometimes arise for people who are inattentive or do not service their car in a timely manner.
These include:
- Buying fuel at “left-handed” gas stations – this category also includes the purchase of cheap “grades” with various additives disguised under the names “E”, “ER” and others. It is not profitable for large chain gas stations to deceive customers, because selling normal fuel is cheaper than giving bribes to everyone, especially when it comes to the scale of the country, but the legislator does not prohibit selling some 95Er, with the alcohol content honestly indicated in the specifications. All drivers know about this, but greed takes over and such fuel kills the engine over time. The same situation has developed around “cheap underground” gas stations selling fuel siphoned off from truckers or military personnel.
- Dirty fuel and air filters - a symptom of this problem is when the VAZ 2114 stalls while driving or when you press the fuel pedal. Both filters are involved in the process of forming the fuel mixture, therefore, when the fuel one breaks, the gasoline supply is unstable, and if the air filter is used, the mixture becomes over-enriched, which in both cases leads to flooding of the spark plugs.
- Spark plugs - this car part can fail not only due to the reasons described above, but also due to age and improper care. Experienced car enthusiasts check spark plugs in VAZ cars at least once a month. To do this, you need to unscrew it with a spark plug wrench and evaluate the carbon deposits - the working spark plug has a light gray electrode and a light brownish carbon deposit. If the color is different, it's time to purchase a new set.
- Lack of fuel - everyone knows that it is better to drive on a full tank, but domestic motorists, due to the constant lack of money, the eternal crisis in the country and other similar reasons, prefer to drive on an almost empty tank and refuel only when absolutely necessary. At the same time, the accuracy of FLS on domestic cars is far from ideal and VAZ is no exception. Therefore, stopping at an angle, driving until the car stalls, topping up the tank on the road from a canister have a very negative effect on the fuel system, debris gets into it, and fuel is constantly supplied along with air.
- “Left” service stations - the saying “the miser pays twice” is most relevant when it comes to cars. Garage services, repairs from friends and other attempts to save money often turn into the fact that your VAZ 2114 injector does not idle, there are engine problems, and repairs need to be carried out at an official service center.
Fuel supply faults
It is quite easy to find out that the car stalls while driving due to the engine being “choked” with the fuel mixture - during a long drive you will find that the signal of the sensor responsible for this function is constantly on.
Here the problem lies in low-quality fuel, which does not quickly “ignite” from the spark of the candles. It can also be caused by gasoline not meeting the requirements for the octane number specified in the vehicle specifications. If there are problems with fuel, the gas pedal will be pressed all the way, and the car will not begin to gain speed. In addition, the car will periodically stall when the clutch is engaged.
Another symptom indicating problems with fuel is the appearance of problems with the car after refueling. The problem is characterized by a rapid drop in engine power at full speed, as well as when constantly changing gears. The way out of the situation is to completely drain the bad fuel mixture, wash the engine and all the fuel system pipes.
Also, the car will constantly stall if there is an interruption in the supply of the fuel mixture. This may be due to contamination in the following system components:
- Dirt in the fuel filter;
- Problems with injector nozzles;
- Dirty throttle valves;
- Fuel pump power failure.
The main symptom of a malfunction of these parts is that there will be a gradual drop in the power of the car’s engine, after which the car will stall even after sharply pressing the gas pedal. If you do not release the clutch carefully when changing gears, this will also cause the engine to stall.
The contamination of the fuel filter and fuel pump can be judged by the unstable operation of the machine even during idling and during rapid braking (when the supply of the fuel mixture decreases). And if the performance of fuel filters can be easily established during an external inspection and eliminated by replacing them, then to detect other causes, you need a full-fledged computer diagnostics, which can only be carried out in a car service center.
Another reason for a stalled car associated with the operation of the fuel pump is boiling gasoline in the fuel pump. This happens mainly in hot weather when the car is moving slowly or standing on the highway in traffic jams. The car will start to stall while driving, but when you turn on the idle speed and press the clutch, it will start again.
If boiling occurs, it is better to stand in a traffic jam with the engine turned off and gradually cool the car. After 5-10 minutes, the car's operation will be stable again.
Advice: if you recently did a wheel alignment with your own hands on a VAZ-2107, then to cool the car, proceed as follows - throw a piece of cloth made of dense material over the fuel pump body, which you first moisten with cold water.
REASONS FOR "BLONDES"
Sometimes poor performance of the injection system is simply due to inattention to the condition of the car and untimely maintenance.
1. Filters are clogged. Replacing air and fuel filters is a mandatory part of car maintenance for experienced car owners. The average service life of filters on a VAZ is 30,000 km. The actual value depends on the quality of the fuel and the filter itself, and operating conditions. If the car has traveled more than 100 thousand kilometers, it is advisable to change the filters more often, every 10-15 thousand (or once a year). During this mileage, dirt inevitably accumulates in the system.
If your car stalls in neutral or immediately after starting the engine, start by inspecting the filters.
2. Lack of gasoline. The critical fuel level cannot be allowed. Dirt may get into the fuel line and settle at the bottom of the tank. If the gauge has reached a critical level (or does not work), the car has just been driving, and after stopping it does not start or starts and stalls, you may need to add fuel.
Firstly, the accuracy of the FLS on the VAZ is not ideal. Secondly, if you stop at a slight level on a slope, fuel may not be sucked in by the pump at all or may be mixed with air.
3. Crooked hands. If the problem appears immediately after repairing the machine, carefully check the connections of all chips or the integrity of the wires. The reasons why the engine stalls may lie there.
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.
How does this happen
If the car is running normally, all you need to do is start it and wait until the engine warms up to the optimal temperature. The tachometer indicator at this moment is at 2-2.5 thousand rpm, and then gradually drops to about 800 rpm as the power unit warms up.
But when there are problems, the idle speed jumps and changes sharply. The range of revolutions difference on the tachometer can be significant, up to 1.5 thousand revolutions. The car seems to live its own life. After some time, this phenomenon stops. But the next time the ignition is turned on, everything repeats.
Car exhaust system problem
The engine may also stall if the tubes responsible for removing gases are malfunctioning. At full speed, the car will quickly begin to “choke”, and pressing the gas pedal completely stops the engine. Malfunctions in the operation of the exhaust pipe system in 90% of cases are caused by contamination and clogging of the muffler. However, the catalyst may also fail.
In the first case, carefully clean the muffler and remove foreign objects from there. If there are problems with the catalyst, conduct a complete diagnosis of the exhaust system and replace this element.
Fuel filter
This element acts as a fuel purifier that enters the engine. If the fuel mixture contains a large amount of dirt, various impurities and particles that should not enter the power unit, this can cause many problems.
If the fuel channel begins to become clogged, the XX sensor will not be able to work correctly. Therefore, this will lead to the VAZ 2114 injector stalling when cold. If the problem is not corrected, the situation may only get worse.
What to do if cars with automatic transmission stall?
If your vehicle has an automatic transmission, then the problem should be found in the electrical supply. If you abruptly switch from one gear to another, or while switching gears while braking, the settings may be distorted, and the on-board computer will receive a signal to turn off the engine.
Also, models with automatic transmission may stall due to malfunctions of the hydrodynamic transformers of the gearbox. This problem mainly manifests itself during acceleration and requires urgent intervention from car service specialists.
Sources
- vaz-russia.com/vse-ob/pochemu-glohnet-mashina-na-hodu.html
- o-ladagranta.ru/vaz-2115-glohnet-na-holostyh-oborotah-prichina/
- nadomkrat.ru/innteresnoe/pochemu-mashina-vaz-glohnet-na-holostyh-oborotah
Do-it-yourself troubleshooting
Many of the defects from the list above can be eliminated yourself in a few minutes. Identification will take much longer.
Diagnostics of mass air flow sensor and IAC
The mass air flow sensor and idle air control act as regulators of air flow into the combustion chamber.
Failure of these sensors will result in increased fuel consumption, and a broken rod will affect the speedometer needle, which will remain stationary until the problem is corrected.
Diagnosis of DPCV
Crankshaft sensor position
Failure of the crankshaft position sensor will negatively affect the operation of the engine as a whole. Loss of synchronization between the engine and the injection system prevents the vehicle from starting. You can accurately determine the condition of the sensor only using a multimeter.
To do this, follow these steps:
- Set the sensor to a maximum value of 200 mV;
- Connect the multimeter and close the rod with a screwdriver;
Checking DPKV with a multimeter
Video about checking the crankshaft rotation sensor
Lambda probe diagnostics
Location of the oxygen sensor (lambda probe)
The sensor reads the amount of oxygen in the exhaust gases and sends a signal to the ECU to increase or decrease the air supply to the combustion chamber. Diagnostics is carried out with a multimeter on a hot engine. The procedure is as follows:
- One core of the device clings to the ground, the second to the sensor output;
- When recharging the engine, the multimeter reading should be between 0.2 and 0.9 V;
When checking the lambda probe, the voltage readings should be within 0.2 - 0.9 V
Video about checking the lambda probe
Speed sensor diagnostics
The vehicle speed sensor is located in the gearbox. Its diagnosis is carried out by visual inspection of wires and contacts. If oxide is detected, it must be thoroughly cleaned.
Replacing the air filter and glow plugs
Air filter for VAZ-2114
The presence of a large amount of dust on the housing and inside the air filter requires immediate replacement.
As its permeability decreases, the engine lacks air in the combustion chambers. Due to this, the fuel does not burn completely, and the rest is thrown out and burned in the exhaust pipe, which can burn out as a result.
Heavy carbon deposits on the spark plugs or any mechanical damage to the housing require replacement.
Oil deposits on spark plugs
Important! If the car has been operated with this malfunction, it is recommended to replace the spark plugs, as due to high fuel consumption they will be filled.
Checking wires
The easiest way to diagnose high-voltage cables is in the dark, just open the hood. If the wire is “pierced”, a spark will be visible beating off to the side.
Visual inspection of high voltage cables
Another reason hiding in this place is poor contact, the appearance of oxide. To do this, you need to visually evaluate the ends of the wire (white, blue or green plate), which must be thoroughly cleaned, washed with a wedge (WD-40), dried and reinstalled.
Healthy! Don't forget the term "metal fatigue". This means conductivity deteriorates due to the contacts being in constant voltage mode. Therefore, high-voltage cables must be periodically replaced with new ones (their specific duration depends on the manufacturer and is indicated on the packaging).
Checking the intake manifold
Most often, air leaks occur through the connection of the intake manifold to the cylinder block. This is due to wear of the filling. This is not difficult to identify. To do this, you will need regular carburetor cleaner. With the engine running, you need to spray all connections and places that make you suspicious with an aerosol can (microcracks in the commutator body itself are possible).
Checking the intake manifold
If the engine runs unchanged, this is not the cause of the malfunction. If the engine speed increases and the engine clicks, replace the manifold or intake manifold gasket.
Healthy! There is no need to weld or glue the intake manifold. The patch will not last long, and after a while the problem will return.
Cleaning the throttle valve
The throttle valve must be regularly cleaned of carbon deposits.
Due to the accumulation of large amounts of carbon deposits, the throttle valve may not be in the correct position. To fix this, you will need to remove the throttle assembly and clean it with a vadashka or carburetor cleaner, and then reinstall it.
Healthy! The assembly must be thoroughly washed; you can soak it in gasoline for a while.
Fluctuations in engine speed are a common problem in injection engines. The fact is that the ECU, when receiving an incorrect signal from a non-functioning sensor, mistakenly opens the air supply solenoid valve. TPS reports that this cannot happen and the engine has already exited heat mode. It was at this time that the idle speed of the VAZ-2114 began to fluctuate. Therefore, if this problem appears on your machine, do not worry. If the cause is identified and eliminated in a timely manner, there is nothing to worry about.
Auto-assistance
At the moment, the vast majority of VAZ-2114 passenger cars have injection engines. Therefore, we will consider the problems that cause the engines of the “fourteeners” to stall specifically for them. In principle, the VAZ-2114 engine may stall due to a loss of fuel supply to the engine cylinders or due to the lack of a spark at the spark plug electrodes. But there are quite a lot of reasons leading to this, and the driver, and sometimes even the service station specialists, are not always able to find them quickly enough.
The most difficult thing to find is when warmed up to operating temperature, suddenly stalls, and after it cools down a little, it starts and runs again without problems, until it stalls again. To find this fault, you will need two instruments: a pressure gauge and a high-voltage arrester.
Install the pressure gauge on the fuel rail, start the engine and under load it should run until it stalls. Look at the pressure gauge readings; if the pressure in the power system is normal, then immediately connect the high-voltage spark gap and, by turning the crankshaft with the starter, determine whether there is a spark on the spark plugs. If there is no spark, most likely the fault will be in the ignition module, which will have to be replaced. But before doing this, you will also need to check the crankshaft sensor, the failure of which leads to similar problems with the VAZ-2114 engine.
Throttle valve
The cause of the breakdown is contamination of the throttle valve. The car's response to the gas pedal is late, the speed is uneven, the engine stalls, the part needs to be washed. Necessary:
If these steps do not help, the problem is related to the power supply (see below).
On foreign-made cars, the throttle damper could fail. Then, when you release the gas, the engine will stall. The part is responsible for returning the damper to its normal position, eliminating dips.
To check the damper you need:
The part should return almost to the limit, pause and not reach the end so quickly. If no deceleration is observed, the damper is faulty. It needs to be replaced, repair is impossible.
Throttle valve dirty.
Idle mode
Minimum: vehicle engine operating mode with neutral gear engaged. It features minimal engine load and low fuel consumption.
Standby mode is used:
- for supplying engine oil from the crankcase to the clutch units after the vehicle has been parked for a long time;
- for heating the power unit in the cold season;
- in cases where stopping the engine is impossible or undesirable.
At normal engine speed at idle, the crankshaft speed is 2000 rpm, gradually decreases to 800, and then remains at this level. However, it also happens that the power plant operates unstable when switching to this mode: it randomly changes the number of revolutions in the range of 500-1500 rpm, “throttles” and stalls. This tells us: a failure has occurred in the engine control system, the causes of which must be diagnosed and eliminated as soon as possible.
The movement of the tool arrow indicates a change in motor speed
Determining the specific cause of the malfunction is not easy, but it cannot be ignored - this can lead to critical engine damage and the need for expensive repairs. Also, driving a car with an unstable engine at idle speed distracts the driver's attention. He must constantly monitor changes in the number of revolutions and keep his foot on the accelerator pedal, preventing the engine from switching off in case of braking or a short stop.
Regulator XX
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This is one of the fairly common reasons why the VAZ 2114 injector stalls at idle. Regulators called XX or IXX are special devices that help control engine speed at idle. For the power unit to function properly, some air must pass inside. It, in turn, is detected by the mass air flow sensor, and the fuel controller supplies fuel based on sensor readings. Also, the number of revolutions is controlled by the DPKV. But it is the XX regulator that is responsible for the air supply, regardless of the operation of the air valve.
If an IAC system is installed in the car, then, as a rule, the car owner does not need to warm up the engine for a long time before starting to drive. However, this type of regulator is not capable of self-diagnosis. Therefore, if it fails, the VDO VAZ 2114 dashboard does not notify the driver that this unit needs to be checked.
Fuel quality
One of the reasons is low quality gasoline, which does not meet the octane requirements for the car. The driver needs to remember where and what kind of gasoline the vehicle was last filled with. If it is indicated that the motor should run on AI-95 or AI-98, pouring AI-92 into the tank is dangerous.
The problem is caused by fuel - when you press the gas pedal fully, the speed does not pick up, and when the clutch is depressed, the power unit stalls. The situation is explained by the weak spark produced by poor fuel.
To fix the problem you need to:
Car engines are sensitive to fuel quality.
