VAZ 2110 8 valve injector stalls at idle

For normal engine operation and acceptable fuel consumption, it is necessary that all power unit systems operate properly. In this case, the engine should operate normally both under load and in idle mode.

In practice, drivers quite often encounter a problem when, after releasing the gas, engine speed does not fall or falls with a long delay. It is quite obvious that high idle speed indicates a problem and is the cause of increased fuel consumption.

The main reasons when the car stalls at idle

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.

Speed sensor

The sensor is located directly in the gearbox. One of the signs of its breakdown is unstable idle. Sometimes the engine stalls in this mode, but more often the speed fluctuates. An additional symptom is the speedometer not functioning properly.

First of all, the sensor must be checked for integrity. Be sure to consider its contacts and the wiring leading to them. Contaminants are removed, and it is better to apply Litol to the cleaned surface.

If cleaning does not help, you will have to test it. For this:

remove the sensor;
straighten the cable and turn the unit with the drive towards you;
the first contact on the right on the connector is ground, the middle one goes to the speedometer, the left one supplies power (12 volts);
clamp the drive in a screwdriver (set to unscrew);
connect the red probe to the central wire, and ground the black probe to the body;
start the screwdriver;
If the multimeter shows an increase in voltage when rotating, then the sensor is working.

Troubleshooting options

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 malfunction

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.

Filter 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.

Car : VAZ 2112. Asking : Belkin Ivan. The essence of the question : VAZ-2112 stalls at idle, what should I do?

Hello! I have the same problem starting the engine on a VAZ-2112. At one time it takes a long time to start, but then it starts with difficulty, and at another time it may start the first time and immediately stall. What could be the reason for this behavior? There is no difference whether it starts when it is cold or when it is hot.

Throttle sensor

If the TPS is faulty, then the VAZ car often begins to work unstably. The main signs of a problem include:

floating speed at idle;
speed reduction;
jerky acceleration;
sudden engine shutdown.

The sensor in question most often fails for the following reason - abrasion of the coating on the base. This prevents the signal from reaching the controller, which causes the motor to malfunction. Failure of the slider leads to a similar result. Any of these problems can be recognized visually.

Stalls at idle, why?

Such a problem as: the engine stalling at idle speed can be heard quite often. And even if after some period of time the engine does start, the cause of the malfunction will have to be looked for one way or another. And the sooner the better, because there may be several of them.

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The video below shows an example when a VAZ-2112 stalls at idle:

Reasons why the engine stalls

In all cases when the engine is unable to maintain idle speed, the malfunction is associated with contamination or failure of any part. The most basic elements to pay attention to:

Clogged or broken idle air regulator.
IAC on VAZ-2112
Carbon deposits or contamination of the throttle valve and injector channels require cleaning and diagnostics.
Cleaning the throttle valve from dirt
The presence of significant deposits in the fuel supply system and fuel pump, as well as the grid.
Failure of the mass air flow sensor.
The engine crankcase ventilation system is dirty.

Location of the throttle valve on a VAZ-2112 - photo of an editorial car

Checking the crankshaft position sensor

If the speed indicator on the VAZ-2110 is floating, and previous actions did not bring any results, then you need to make sure that the above sensor is working. Here too you will need a multimeter, and also a screwdriver.

Set the measuring device so that its maximum value corresponds to 200 millivolts. Connect the probes to the sensor wires (ignition is on). Bring the screwdriver closer - the multimeter will react to this by fluctuating readings. Lack of response indicates a breakdown.

Signs and solutions to problems

Below we will look at the most common signs when a car stalls at idle.

The car starts and stalls immediately after the starter is turned off.

When a car suddenly stalls at idle, the most common reason is that the throttle valve is dirty, causing it to become clogged and sticky.
This problem is solved by simply cleaning it, using a carburetor cleaner from a bottle. This happens due to the use of low-quality fuel and the presence of large contaminants entering through the air filter (for example, oil). This is what a dirty damper looks like.
It is also worth paying attention to the presence of contaminants in the oil trap system in the engine crankcase. Because if this filter is dirty, the engine will simply stall from excess crankcase gases.

The car starts and immediately stalls

Checking the MAF sensor readings

The cause of a malfunction with such symptoms is most often the above-mentioned sensors: IAC (idle air control), MAF (mass air flow sensor). Before purchasing new parts, you need to disassemble them and check for contamination. Also check the mass air flow sensor for the main signs of malfunction. However, if you have the opportunity to check the malfunction using diagnostic equipment, then do not deny yourself this. Read more about replacing the IAC here, and about replacing the mass air flow sensor here.

The functionality of all sensors should be checked in order, starting from the least structurally complex to the most.

Mass air flow sensor

How stable the VAZ-2110 operates largely depends on the correct functioning of the mass air flow sensor, because it is responsible for creating the optimal fuel-oxygen mixture. Device failure is caused by excess fuel or air. Regardless of this, starting the power plant in normal mode becomes impossible.

Signs of a malfunction of the mass air flow sensor are as follows:

fuel is consumed more actively and usually with less efficiency;
the engine starts unstably or does not respond to the starter at all;
the motor malfunctions while driving;
when the vehicle is idling, the revs fluctuate.

It is not difficult to make sure that the problem is in this sensor. For this:

turn on the ignition of your VAZ-2110 car (but not the engine);
take a multimeter;
set its scale to DCV 20 volts;
find the mass air flow sensor (under the hood, at the outlet of the air duct corrugation);
connect the red probe to the yellow wire or the one located closest to the windshield (pierce the rubber band);
to green (central) - attach black;
take readings.

If the multimeter shows from 0.99 to 1.03 volts, then everything is in order with the sensor. Otherwise it is changed.

GOOD TIPS

First, let's look at the reasons common to carburetor and injection fuel supply. That is, reasons beyond their control. Anyone who has looked for the causes of problems themselves knows that this is done by the method of elimination. But the law of meanness always works, and the reason is, as a rule, in the last node being checked. Therefore, let's turn to statistics and, based on its prompting, begin to implement the random method.

If the car runs on a 16-valve injector and stalls, then you need to change the oxygen sensor; it is possible that it is not tightly connected to the connector located on the air filter housing. You should connect it correctly, if this does not help, then you should clean the injectors, since the gasoline now contains impurities, and the injectors become clogged.
The reason that the engine stalls while driving may be the idle speed sensor (IAC), or more precisely, the idle speed controller (IAC). By the way, if there are problems with the IAC, the engine stalls even at idle. So, you should remove it and start by simply cleaning it. Don't forget to clean the mounting hole on the throttle assembly where the sensor needle goes. After cleaning, you need to check its serviceability. To do this, with the ignition on, bring the power block to the removed sensor; if the conical needle extends, then everything is in order with the sensor, but if not, then the sensor needs to be changed.
The reason that the car stalled while driving may be due to wear on the rollers or timing belt. In both cases, you need to contact a specialist. This is a serious knot. Giving absentee advice regarding the repair of this unit is, to say the least, irresponsible.
When you start the car when it's hot, the engine stalls. The crankshaft sensor may need to be replaced. It is possible that the catalyst burned out and a plug formed in the exhaust system.

The list of supposed reasons can be continued indefinitely and one cannot find a reason why the VAZ-2110 stalls while driving, regardless of whether the injector supplies fuel or the carburetor. But this is not a reason to give up. The road can be mastered by anyone walking or driving, you just need to fix the problems in the car. We can say for sure that what will not help you start the engine is kicking innocent wheels and calling the car’s mother an unkind word. Remember, he doesn’t have a mother, he’s half orphan. Please be understanding about this.

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Let's sum it up

As you can see, in order to accurately determine why the engine speed is not reset, in many cases in-depth diagnostics may be necessary. For carburetor engines, cleaning and adjustment of the carburetor itself is often necessary, while the injector will require computer diagnostics.

If the problem is not on the surface (the throttle cable has become sour, after washing or dry cleaning, the carpet in the cabin is not installed correctly, which presses the gas pedal, etc.), then it is better to take the car to a service center.

The most complex situation is when the design of the power system involves the presence of a large number of sensors and actuators. In this case, even the use of diagnostic equipment does not always allow you to quickly and accurately determine the problem.

If diagnostics are difficult, it is optimal to deliver the car to a service that specializes in repairing a specific brand of car. As a rule, these are official dealer service stations; it is less common to find third-party organizations.

Finally, we note that timely detection of a problem allows you to save the life of the internal combustion engine and other components and assemblies. In other words, high idle speeds, floating speeds and jumps indicate that there are problems with the air/fuel supply or with mixture formation. Ignoring such problems negatively affects the engine and its service life.

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How to cure a car?

First you need to diagnose the fuel pump:

remove the cover from it and carefully inspect visually, paying special attention to the area near the valve; If there is no o-ring, take corrective action.

In this case, the fuel pump depressurized and interruptions in the fuel supply began to occur. This is exactly what is causing the car to malfunction. After the seal is restored, the VAZ-21124 (16 valves) will begin to move smoothly along the road again. You can replace the O-ring yourself, the main thing is to find the right ring and tools.

Troubleshooting

To change the gears in the gearbox when you pick up speed or, conversely, reduce it, each time the engine crankshaft is disconnected and then comes into contact with the power transmission again. This happens quite often, and over time, signs of wear on the clutch parts begin to appear, which is reflected in the behavior of the car on the road while driving. Our instructions will help you figure it out. All signs of a malfunction of this unit are divided into two main groups:

The first is when the clutch does not disengage completely, they say that it is “driving”
The second - on the contrary, if it does not engage completely, or the VAZ 2112 clutch slips, as they say

Drives the clutch

If when you press the pedal, the discs do not move completely apart, as they say, your clutch “leads.” It turns out that the clutch discs are in contact, and complete disengagement does not occur. Many experienced drivers know how to check the clutch to see if it is not completely disengaged; there is nothing complicated in this check. At low engine speeds, press the pedal all the way and change gears. When the gears are switched quietly and easily, it means that the clutch is completely disengaged. The appearance of gear noise and difficulty during shifting means that it is “driving.” The reasons may be: a) mechanical

The linings on the driven disk are broken or the rivets on them are loose
The full pedal stroke has decreased (the clutch in the VAZ 2112 has become tight)
The driven disk was warped, so its end runout began to exceed 0.5 millimeters
The pressure plate is warped or skewed
The driven disk hub began to jam in the splines of the gearbox input shaft
The rivets securing the pressure spring are loose
Irregularities have appeared on the surface of the driven disk lining (photo below)

Burnt driven disk VAZ

b) malfunctions associated with the drive, in this case, as a rule, you notice that the clutch has failed in the VAZ 2112

Fluid leak (hydraulic)
Air entering the system (in hydraulics)
Broken cable (in mechanics)

To eliminate mechanical causes, we adjust the drive, clean and lubricate the splines, straighten or replace the driven disk, as well as replace the friction linings if necessary. It is worth understanding that any clutch is not eternal; it will still have to be replaced. Problems with hydraulics require pumping to remove air and top up fluid, as well as checking the tightness of connections and the integrity of pipelines. Replacement of the cable in case of wear or breakage. Repair and replacement of all parts that have failed; by the way, you can fix most problems yourself.

The clutch is slipping

If, when driving the car, you smell the smell of burnt plastic, and when going up a hill, the car greatly reduces its speed, in addition, it accelerates much worse, don’t even go to your grandmother (it’s clear and without prompting) that the clutch in your VAZ 2112 is slipping. So. :

Simply put, the driving and driven discs, although you have the clutch engaged, are not compressed tightly enough
There is a very simple way to find out - to do this, stop the car with the handbrake (parking brake) and start the engine
Then, having squeezed the clutch, engage the gear, then smoothly press the gas pedal and smoothly release the clutch - the engine should stall
But if this does not happen, it turns out that the clutch in your VAZ 21124 is actually slipping

Possible causes of slippage:

Lack of pedal free play
Wear or burning of the friction linings on the driven disk
Oil gets on the friction linings themselves, on the flywheel and the release disk.

In this case, we immediately check how easily your clutch pedal moves; if its movement is limited, try adjusting the free play and check if the problem has gone away
When the clutch slips due to worn clutches, you need to determine how bad the wear is.
If the wear is small, then you are very lucky; such slippage can be easily eliminated by adjusting the free play of the pedal
When the wear of the friction linings is too great (the distance between the working elements and the rivets is no more than 0.2 millimeters), then the driven disk should be replaced with linings
If the linings are oily, then eliminate the lubricant leak, then wash all clutch parts with kerosene, then wipe thoroughly, and lightly rub the linings themselves with sandpaper

Electrical system

A failure on the part of the electrical system is indicated by:

increased fuel consumption;
difficult starting of the engine and its unstable operation;
tripling.

It should not be ruled out that your VAZ is faulty:

power wiring;
contacts in the generator;
spark plug.

Start your inspection with the candles. The presence of soot, excessive clearance, or partial cable breakage on them increases the resistance. Failure of insulation also leads to voltage leakage. Therefore, the wires are inspected closely, paying attention to the wiring of the terminals and the contacts of the latter.

VAZ 2110 stalls while driving, 8-valve injector, possible causes and solutions

The main reasons when the car stalls at idle

Speed sensor