In order to figure out the reason for the lack of idle speed on your own, without contacting car service specialists, you need to have at least the slightest idea of which unit to look into, which sensors to test. Fortunately, there are forums on the Internet where they will prompt you and give you practical advice, and On YouTube they will also show you what needs to be done. Our article, in general, is about this.
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.
Functionality check
We have already talked about where the sensor is located. The first thing you need to do is find it and remove the block with wires. On a VAZ 2110, you must first unscrew the fastening elements of the throttle assembly, then move the entire assembly by about 10 mm.
Check with a voltmeter that the voltage is appropriate to the sensor. To do this, you must first connect the negative terminal of the battery to ground and connect a voltmeter to terminals A and D (they are usually marked), then:
- If the voltmeter shows less than 12V, this most likely indicates that the battery is not charged;
- If nothing is shown, faults should be looked for in the electronic control unit or in the circuit;
- If the reading is 12V or more, you need to check the regulator directly, or more precisely, its resistance;
- We connect a tester to the four terminals, which should give a total resistance reading of 50 or 55 Ohms.
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.
Checking the sensor yourself
The sensor is located in the throttle body and to remove it for inspection, you just need to unscrew two screws.
To dismantle the IAC, you need to disconnect the block and unscrew two screws.
Before dismantling, you need to thoroughly clean the place of its attachment from dust and dirt and remove the negative terminal from the battery. But first, a check.
Sensor connection diagram.
We look at the connection diagram and check the sensor using a conventional multimeter in the following sequence:
- Check for power supply to the sensor. To do this, measure the voltage at the two outer contacts of the block, A and D. Turn on the ignition, place the black probe of the multimeter on the engine ground, and the positive probe on the contacts one by one. The voltage should be within 12 Volts. If it is less or absent altogether, we look for an open circuit or blame the electronic control unit for everything. But first, we check the voltage at the terminals from ECU 4 and 54. Here, naturally, there should also be 12 V.
The voltage is normal.- We switch the multimeter to ohmmeter mode and measure the resistance between contacts A-B and C-D on the sensor itself. As can be seen from the diagram, we are checking the resistance of the winding of the stepper motor of the regulator. Between the indicated contacts, the nominal resistance is from 40 to 80 Ohms, according to the factory rating - 53 Ohms.
- We check the electric motor for short circuit of the windings. To do this, measure the resistance at terminals A-D and B-C. The resistance should tend to infinity, that is, there should be no contact between the two windings. If there is resistance, no matter what the value, we conclude that the windings are short-circuited. This cannot be cured; we replace the sensor with a new one.
It cannot be said that this testing method 100% guarantees the functionality of the sensor; we only checked its electrical part. The mobility of the cone valve and the magnitude of its stroke are of great importance. And this can only be checked either at a special stand or with a special tester.
Checking the operation of the mechanical part of the sensor
To check, remove the sensor from the throttle assembly.
However, if the electrical part is in order, you can check the mechanical part of the regulator by eye:
- Unscrew the sensor and remove it from the throttle body.
- We connect the contact block to the sensor.
- Turn on the ignition. When turned on, the valve should move forward. If this does not happen, the rod is coked or the stepper motor is not working properly.
- We measure the distance between the sensor body and the conical valve - nominal 24 mm.
We measure the distance with a caliper.
If we removed the sensor from the car and the electrical test passed, but we still did not achieve mobility of the cone valve, we try to clean the regulator using a soft swab, a cotton swab and WD-40 penetrating lubricant or an aerosol carburetor cleaner. Good luck to everyone and stable idle speed in any weather!
Sensor with carbon deposits.
Soak the valve in cleaner.
Cleaned sensor.
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
Let's sum it up
As you can see, even taking into account the relative simplicity of the part itself, the IAC performs a number of important functions. Of course, if a malfunction occurs in the internal combustion engine, it is necessary to check this element. At the same time, for diagnostics and maintenance of the VAZ 2110 idle speed sensor, no specialized equipment is required. Also, replacing the XX regulator can be done with your own hands in a regular garage.
Finally, we note that sensors of this type are quite reliable and rarely fail. However, problems still arise on cars with high mileage. In any case, if the idle speed is disrupted, it is important to make sure whether the breakdown is really related to the IAC. The above information will allow the driver to quickly check the sensor (electronic and mechanical part of the idle air valve).
Sources
- https://KraiAvto.ru/vaz-2110/datchik-holostogo-hoda-vaz-2110-neispravnosti-proverka-i-zamena-rhh-vaz-2110/
- https://ladafakt.ru/net-holostogo-hoda-na-vaz-2110-inzhektor.html
- https://osensorax.ru/rashod-uroven/datchik-holostogo-hoda-vaz-2110
- https://ladaautos.ru/vaz-2110/chto-delat-esli-padayut-oboroty-i-gloxnet-vaz-2110-8-klapanov-inzhektor.html
- https://carfrance.ru/priznaki-neispravnosti-datchika-xolostogo-xoda-na-vaz-2110/
- https://prometey96.ru/ustrojstvo/vaz-2110-glohnet-na-hodu.html
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.
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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Replacement procedure
Replacement is carried out in the following order:
- We de-energize the on-board system by removing the negative terminal, which is located on the battery;
- Disconnect the block from the sensor. For a VAZ injector this happens by pressing a plastic latch;
- We unscrew two screws, and it is recommended to first unscrew the left fastener, then the right one;
- Now the regulator has been removed and there is no problem in replacing it with a new one;
- Before installation, it is advisable to spread oil on the sealing ring. See if there are even the slightest cracks on the ring, in which case it needs to be replaced;
- There is also no difficulty in the calibration procedure; the electronic relay will do everything. You just need to turn on the ignition for a few minutes and then turn it off. After this, the speed usually no longer fluctuates, and the car works without failures.
