VAZ 2112 16 valves do not idle

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.

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

When a car stalls at idle, the reason for this is that the throttle valve is dirty; it becomes clogged and sticks. This problem is solved by cleaning, using a carburetor cleaner from a bottle. Reason: low-quality fuel and large contaminants entering through the air filter.
Contamination in the oil trap system in the engine crankcase.

Causes:

malfunction of the idle speed sensor;
throttle valve clogged;
malfunction of the throttle position sensor;
contamination of the injector or carburetor

The reasons for the breakdown can be completely different, so when eliminating them you will have to operate with all sorts of actions.

You need to be able to get your car working without outside help. If your level of awareness or lack of free time does not give you the opportunity to eliminate all the defects yourself, it is better to seek help from knowledgeable people who can save you from unpleasant moments in the shortest possible time.

How to troubleshoot

It is best to contact a service center. This will allow you to quickly identify and fix the problem, but you will have to pay for the services of a specialist. Work that can be carried out at the auto center:

complete replacement of equipment that has become unusable;
regeneration of failed devices;
carrying out preventive procedures and bringing equipment into proper condition

The optimal solution is a complete replacement of non-working equipment. You can also install a new idle speed sensor, throttle valve, throttle position sensor, injector or carburetor

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Why does the VAZ-2112 16 valves stall at idle and not maintain speed?

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

Checking the serviceability of the throttle position sensor (TPS)

Our problem may be caused by a faulty DPSD. But it is this sensor that is tested last, when everything has been tried and tested. But in vain, it is easy to test, you can save a lot of time and money if you check this sensor. How to do it:

This sensor is located on the throttle pipe, it is connected to the throttle axis. The sensor is secured with two screws. When removing the sensor, you should pay attention to the condition of the throttle valve, whether it is coked. If yes, then there will be the same symptoms as with problems with the sensor. However, the sensor can be checked without removing it.
To do this, you need to measure the voltage at the DPSD terminals when you turn on the ignition, and it should not exceed 0.7 V.
Next, open the throttle using the plastic sector, and then measure the voltage again. It must be at least 4 V.
Next, check the voltage at the DPZD terminals when the damper moves. It should not change; abrupt changes indicate a sensor malfunction.

Having found out that the sensor is faulty, it should be replaced. On the VAZ-2110, 2 types of DPZD are installed - film-resistive and non-contact. The first is designed for 55 thousand mileage, the second is unlimited, but much more expensive than the first.

Well, dear friends, we have presented some tips for servicing your car yourself. I hope you find them useful.

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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.

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:

Ignition system

Pay attention to the condition of the ignition module (article on module repair here), high-voltage wires and spark plugs. If there are traces of corrosion, melting on their surface, or there are cracks on the body, this will only mean that each of the above elements will require replacement, since they cannot be repaired or corrected. In order to correctly approach the issue of choosing spark plugs for the VAZ-2112, you can read this article.

First we check the wires, and then the spark plugs.

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.

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.

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Testing the mass air flow sensor (MAF)

Let us remind you what we are talking about - VAZ-2110 8-valve injector: the speed drops and stalls. A reasonable question arises: what to do? If the reason is not the IAC, then it is worth testing the mass air flow sensor. Here are some recommendations on how to do this:

Disconnect the sensor connector from the on-board system. The controller that controls the engine will operate in emergency mode, but for short testing this is not fatal. If your car runs much faster, then the problem is most likely in the mass air flow sensor. It's time to clean it.
Replace the sensor with a working one, and then see how the engine works. There are improvements, which means you need to either clean or replace your own mass air flow sensor.
It also makes sense to inspect the air intake; to do this, you need to remove the mounting clamp and carefully inspect the inside of the air intake, there should be no condensation or oil there. If any are found, then it will have to be cleaned with special means.
You can also test the mass air flow sensor using a multimeter. To do this, you need to switch the multimeter to voltmeter mode and set it to 2. The sensor has 2 wires - yellow and green. Yellow transmits a signal to the controller, and green transmits a signal to ground. When the ignition is turned on, we take measurements between these two wires. The engine should not be running. If the readings are in the range of 1.01-1.02, then the sensor is in perfect order. Readings in the range of 1.02-1.03 – it’s time to clean the sensor. And if the indicators go off scale to 1.04, then it’s time to get a new sensor.

Now we have figured out the main symptoms of a malfunction of the mass air flow sensor; neither testing nor troubleshooting is particularly difficult. It is quite possible to cope without after-sales service.

VAZ 2110, 11, 12. Why does the idle speed disappear?

Hello. Today I continue a series of articles about engine management system malfunctions associated with injection wiring problems. Using the example of cars of the VAZ 2110, 11, 12 family.

Models VAZ 2110, 11, 12 are frequent guests in car service centers, because... the years take their toll. The cause of breakdowns associated with the engine management system is often injection wiring.

The following problem arises: on a warm engine, when the fan turns on at idle, the speed starts to rise to 600-800 rpm or the engine may stall completely.

When checking with diagnostic equipment, the use of actuator controls is very informative. With the ignition on and the engine off, forcefully turn on the fan in the diagnostic program menu. At the moment of switching on, the voltage drop in the ADC channel of the mass air flow sensor occurs. The voltage drops from 0.996 Volts to 0.967 Volts (in my case, otherwise the signal can drop even lower).

In this case, the problem also lies in the injection wiring. Inside the car, the wiring masses of the engine control system are screwed to a metal bracket on which the electronic engine control unit is located. The negative voltage from the body is transmitted to these ground wires through the bracket mount. Over time, the tightening of the nut loosens and, one might say, a partial loss of mass occurs.

When a powerful consumer (cooling system fan) is turned on, the ADC of the MAF sensor drifts. In this case, you need to tighten the nut shown in the photo above. Pull the masses onto the bracket itself.

And the mass from the battery to the body.

If it doesn’t help, then we unravel the injection wiring, find the factory twists and solder them.

After the above manipulations, we observe stable idle speed when the engine cooling system fan is turned on.

I hope the article will be useful to car enthusiasts.

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you subscribe to the channel and like the article . If you have any questions, write in the comments, I will try to answer them.

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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.

Testing in pairs should give an infinitely large resistance. If the idle speed sensor on a VAZ 2110 (injector) gives different readings, it means it needs replacement.

You can also test the regulator in another way: remove the sensor and connect the block. Pressing the needle with your finger, watch its extension. When the ignition is turned off, there should be a push of the needle.

If everything is normal, then usually the speed does not fluctuate and the sensor itself is in working condition. If there is no shock, you can try cleaning the mechanism.

This is done using a special cleaner called WD-40. They very carefully, using a cotton swab, clean everything that is possible in the sensor.

Particularly carefully - the rod, as well as the needle. But if this does not help, a replacement is needed.