VAZ (Lada) 2112 1999 - 2008

Car VAZ 21124, 1.6, 16 valves. There was such a problem, the check caught fire and the car sometimes supports, especially when it is cold. At first, it seems like a failure is coming (the car is choking), then after a while it rushes by itself, as if it broke off the chain.

I went to the diagnostics, showed an error on the oxygen sensor, showed a poor mixture. He says like change it. I took a known-good sensor from a friend and installed it and the car began to work at high speeds. I muffled to restart, but the car began to stall at all, and the check did not stop burning. What could it be?

DMRV, IAC, DPDZ, DPKV are new, the pressure in the rail is normal, I changed the fuel pump grid, air filter changed, cleaned the throttle, cleaned the injectors, still did not help. What else can affect a lean mixture? As I understand it, the DC shows an error, but in fact the problem lies elsewhere?

In general, having unscrewed the DC, I noticed that it is black, the engine does not idle smoothly at idle, but as you drive some distance it starts to pull. I let off the gas, the revolutions work at high, 1300-1500 rpm, the compression in the engine is 11-11.5. The vacuum brake booster is new, unscrewed the candles with a white coating (as I read on the internet, this indicates a lean mixture). What else can be in our miracle vaz car? Honestly, this problem has been tormenting for a long time)

Yes, it is difficult to advise anything, since a lot of things have already been done and a lot of things have been replaced. Based on the white coated spark plugs, your engine has a lean mixture. Excluding all the sensors you replaced, it remains to be assumed that there is an unaccounted for air leak. I hope that you have already replaced the candles with the onset of cold weather, they should always be put in new ones for the winter so that the engine starts more confidently.
Check vacuum hoses for intake manifold and other junctions (receiver, manifold to the block, injector junctions, such as seals, rings do not fit tightly). When installing nozzles, it is necessary to lubricate the sealing rings, for example, with diesel fuel. And then they can be torn dry or put askew, here you have an air leak or a fuel leak.

How did you clean the injectors? If, as expected, they were removed from the engine and taken to the service at the washing stand, then this is correct, in the same place one could see the spray

If you used a flush that is poured into the tank, then this is not always useful, even often the effect is the opposite: the dirt in the tank is washed off and chased to the engine, and there it can very successfully clog the nozzles more. And in your text, I did not see information about the adsorber sensor. If it is faulty, then there may be engine interruptions at certain points.
I read about replacing the IAC, TPS. Doesn't the throttle itself stick at the moment when you throw the "gas" pedal? or the cable brakes in the shell? You may have checked this, but the description of your question does not contain this information.

And after you replaced the DC, did you check the error number? after all, she could have changed, and therefore the check remained burning.
But in fact, the lambda error could not be in the sensor itself, but, for example, in poor contact on the connecting block of wires.
Please provide the error number.

It is also necessary to check the wires and connectors for the oxygen sensor, dmrv, dpdz, check the operating parameters of the coolant temperature sensor, it is advisable to travel with a connected scanner and check the parameters of the engine sensors at the time of a malfunction. It is also worth checking the cleanliness of the contacts of the ECU connector, the problem may also be in the ECU. By rich mixture the reasons are described, you can still check the nozzle spray on the stand.

Many owners of the VAZ-2112 could be faced with the fact that at idle speeds begin to float. But, not everyone knows why this effect occurs. In this article, we will consider the main malfunctions, as well as methods for their elimination.

Floating engine speed shown on the dashboard

In a car, speed starts to float for a reason, this is due to the operation of many systems. Before proceeding to consider the causes, it is worth noting that with such an effect or not, but as practice shows, the outcome of the causes is one.

Consider the main problems of the occurrence of floating idle speeds according to the practice of motorists and service manuals:

1. The problem lies in or injection.
2. Unstable ignition.
3. Bad fuel.
4. Out of order () sensor idle move.
5. Error .

Method for eliminating floating revolutions on a 16-valve VAZ-2112

Before proceeding to the elimination of the causes, it is worth noting that untimely repairs can lead to the fact that the engine will achieve a start-stop effect. It means that the motor will start and immediately. Therefore, at the slightest occurrence of floating revolutions, it is worth fixing the problem. So, let's move on to the actual repair.

Fuel system and everything connected with it

The effect of floating speed at idle can occur due to intermittent injection. On old carbureted cars this happens quite often, especially in winter and after it. So, to eliminate the causes on the VAZ-2112, it is necessary to do the following operations:

• Check repair or replace if necessary.
• , which may be clogged due to low-quality fuel.
• Check and . If needed, .
• Check fuel rail tightness.
• Conduct injector wiring diagnostics.

If the cause is found, then you should check whether the effect of floating revolutions has disappeared, if not, then investigate the rest of the systems.

General view-diagram of the fuel system

Ignition

The ignition of the car plays a very important role in setting the speed. It is worth noting that a malfunction of candles (), high-voltage wires or a lock can affect the receipt of such an effect. Therefore, it is necessary to diagnose these particular components and parts, and if necessary, replace them.

Idle speed sensor can be the main cause of floating rpm

Throttle

Throttle body before and after cleaning

ECU errors

The accumulation of errors in the electronic control unit can lead to various incorrect commands. One of them may be idling. So, in order to fix the problem, you need to connect to the car using a special cable and reset all the accumulated errors in the computer.

Possible ECU error codes

conclusions

Diagnosing and eliminating the cause of floating idle speed for the VAZ 2112 is quite easy and simple, but this operation may not be possible for every motorist. Therefore, it is recommended that in the event of a malfunction, contact a specialized car service, but as practice shows, usually motorists cope on their own.

Almost every owner of domestic vases faced the problem of high idle speeds. That is, when the engine is started, the revolutions are as high as they should be, however, when the engine warms up, they do not fall below 1500 or 1000 revolutions, which is not normal. There may be several reasons for this - and a malfunctioning TPS and idle speed controller.

To fix the problem, you should diagnose the main components and components that affect the increase in speed.

Why can there be high idle

One of the main reasons may be the failure of the IAC - the idle speed controller, it is he who is responsible for adjusting the engine speed at idle. At , the revolutions can “float”, increase and decrease spontaneously. With a complete failure of the sensor, at idle, the car may simply stall.

Also, increased speeds can be caused by a malfunction of the throttle position sensor (TPPS). Over time, moisture gets under the sensor, which leads to the formation of oxide and rust on the regulator stem. To check this, you need to unscrew the sensor and carefully inspect it and the stem. If rust is found on them, they should be treated with a penetrating lubricant or WD 40.

Usually the problem increased speed on the VAZ 2110-12 lies precisely in these two sensors. Therefore, first of all, you need to pay attention to them.

Where are the IAC and TPS sensors located

So, for starters, let's check the IAC sensor. It is located on the throttle assembly below the TPS sensor. Dismantling it is very simple - remove the block from the sensor and use a Phillips screwdriver to unscrew the two bolts of its fastening. Then we pull out the sensor or make its diagnostics, read about it below.

The throttle position sensor is located above the IAC and is also fixed with two bolts. It unscrews quite easily, there is no need to remove either the nozzle on the throttle or the throttle itself. Disconnect the block, unscrew the two bolts and pull out the sensor.

To make sure that the problem of high turnover is really in one of these sensors, and maybe in another right away, they should be diagnosed.

Diagnostics of the IAC 2110 sensor

It is possible in several ways. To check we need a multimeter. First, let's describe the simplest way:

IAC test method 1

1. Disconnect the block from the sensor and unscrew the sensor
2. Turn on the ignition
3. We connect the block to the removed sensor, the needle in the sensor should extend, if not, then the sensor is faulty

IAC test method 2

1. Disconnect the negative battery terminal
2. With a multimeter, we measure the resistance of the external and internal windings of the IAC, while the resistance parameters of contacts A and B, and C and D should have indicators of 40-80 Ohms.
3. At zero values ​​of the scale of the device, it is necessary to replace the IAC with a serviceable one, and if the required parameters are obtained, we check the resistance values ​​​​in pairs B and C, A and D.
4. The multimeter should detect an open circuit
5. With such indicators, the IAC is serviceable, and in their absence, the regulator must be replaced.

IAC test method 3

1. Disconnect the block from the sensor
2. Using a voltmeter, we check the voltage - “minus” goes to the engine, and “plus” goes to the terminals of the same block of wires A and D.
3. The ignition is turned on, and the data obtained is analyzed - the voltage should be within twelve volts, if less, then most likely there are problems with the battery charge, if there is no voltage, then you will have to check and the electronic unit control, and the whole circuit completely.
4. Then we continue the inspection with the ignition on, and alternately analyze the conclusions A: B, C: D - the optimal resistance will be about fifty-three ohms; during normal operation of the IAC, the resistance will be infinitely large.

Diagnostics TPS VAZ 2110

To diagnose the sensor, we need a voltmeter.

1. It is necessary to turn on the ignition and check the voltage between the slider contact and the minus with a voltmeter. The voltmeter should show no more than 0.7 V.
2. Now you need to turn the plastic sector, thereby completely opening the damper, then measure the voltage again. The device must show at least 4 V.
3. Turn off the ignition and disconnect the connector from the sensor. We check the resistance between the contact of the slider and some output.
4. Slowly, turning the sector, follow the readings of the voltmeter. Make sure that the arrow moves smoothly and slowly, if you notice jumps - the throttle position sensor is faulty and must be replaced.

Symptoms of malfunctioning DPS

• Deterioration of vehicle dynamics
• floating idling
• Jerks during acceleration
• Increased idle
• Engine may stall at idle

If one or more of the above symptoms are detected, the sensor should be checked and diagnosed in the manner described above.

Which TPS sensor to choose for replacement

• DPDZ / 2110 / GM 2112-1148200 price from 300 rubles
• DPDZ / 2110 / PECAR 2112-1148200 price from 200 rubles
• DPDZ / 2110 / StartVOLT VS-TP 0110 price from 200 rubles
• DPDZ / 2110 / HOFER HF 750260 price from 150 rubles
• DPDZ /2110/ CJSC Account Mash 2112-1148200-05 price from 400 rubles
• DPDZ /2110/ OJSC RIKOR ELECTRONICS 2112-1148200 price from 300 rubles

Replacing the Throttle Position Sensor VAZ 2110

Using a Phillips screwdriver, unscrew the two sensor mounting bolts, disconnect the block and remove the sensor.

If traces of rust or oxidation are found on the rod, which regulates the speed, it is necessary to clean it with a penetrating lubricant.

The question of why idle speeds float is perhaps the most frequently asked question that concerns the engine. Indeed, idle problems are a common occurrence that car owners have to deal with.

The most unpleasant thing is not that it is very serious or the repair will be too expensive and time-consuming, but that there can be a lot of reasons why the idle speed is floating. In this article I will try to help find and eliminate the cause of unstable engine speeds so that you save your time and nerves.

We are looking for the reason why idle speeds float on the VAZ 2110

1. The first thing I recommend paying attention to is the mass air flow sensor (MAF or flow meter). Read how to check the DMRV.
2. The second "suspect" usually becomes the idle speed regulator (IAC), if after checking the flow meter you did not find anything.
3. After that, inspect the wiring of the speed sensor (DS). How to check and replace DS read.
4. The next sensor that can cause floating idle is the crankshaft position sensor (DPKV). The sensor itself is unlikely to have failed, most likely the reason is in the wiring or chip. If you do not find anything strange in the wiring.
5. The throttle assembly can also often affect the idle speed, so it will not be superfluous (throttle position sensor), as well as the throttle valve maybe it needs cleaning. How to clean the throttle wrote.
6. Candles, high voltage wires and the ignition module can be the cause of idle problems, so the first thing, and after and.
7. The idle speed of the engine often floats due to a faulty idle solenoid valve. To test this valve, remove power from it, then turn on the ignition and connect the power wire to the contact on the valve. In this case, you should hear a distinct click, if this does not happen, connect the wires to the contact that is connected to the "positive" terminal of the battery. Even if you do not hear a click, you can conclude that the valve is faulty. If there was a click, but the engine speed floats as before, check its jet.

Among other things, check in what condition it is, it may need to be replaced. Make sure it works properly and there is no air leak.

If the above tips and recommendations did not work or you are not sure that you can master such work, contact the professionals for help, the specialists will quickly and accurately determine the source of the malfunction and stabilize the engine's floating idle speed.

Thank you for your attention, I will be glad if it helped someone. If you know other reasons or ways to check, you can safely supplement this article using the comment form. Until we meet again, take care of yourself and your car.