High speed at idle Aveo. Large engine speed

As with many other faults, the causes of high idling of the engine should be sought from simple to complex. In fact, the reasons for these can be quite a few, but among them you can allocate the most common:

• large idling due to air supply with collector (with the subsequent hit in the engine);
• increased revs on idling due to leakage in a vacuum line;
• high revs At idle due to the malfunction of the ignition system Engine.

As you can see, these reasons are quite "smeared", and they should be specified. But the first thing you need to do is the standard procedure - to drown out the car, remove the negative battery terminal for 15-20 seconds, then connect it back and check whether the problem remains.

High idle engine speed due to air supply and vacuum line leakage

So, if the cause of high idling has become an excessive air from entering the engine, then the cable should be checked here first. throttle valve. Because of it, the flap can remain unnecessarily open at idle, as a result of which the latter grow. This happens, since the "brains" of the engine see that there is a lot of air (more precisely, oxygen) comes into the collector, and therefore adjust the fuel supply, increasing it. As a result, the engine is growing at idle. Assist in this case can clean the throttle with special chemicals.

More air in the collector can also flow due to disruption of tightness in the air intake system. In this case, you should check all vacuum highways, the heads of the heads and all areas of the air traffic in the engine to suck air. Listen to hissing sounds, which can be a key indicator of vacuum leakage and air suction.

Increased idling due to problems in the ignition system

In this case, the reason lies in one of the parts of the ignition system - also a fairly frequent reason for the problem with turns. It should be checked here and, if necessary, replace the distributor cover, ignition wires or elementary spark plugs.

Other reasons for elevated idolock turns and solutions methods:

• Sensor idling. In principle, this malfunction should be included in the list of distributed ...
• Fuel pressure control It can work with too low pressure. Check the fuel pressure using a special pressure gauge to check the fuel pressure. Replace the fuel pressure regulator if necessary (not independent work for many drivers).
• Incorrectly established or shot down ignition advance angle (In this case, idle turns usually increase not strongly).
• The reason may be fault in a computerized management system Engine. You should read errors using a diagnostic instrument to identify the problem.
• Generator Also sometimes causes high idle speeds. If it works incorrectly and generates not enough current, the engine will try to unwind it even stronger to balance the voltage.
• If you know what looks like and where is PCV valve and its hose, then inspect them. With the help of pliers, overcover the hose of this valve. The frequency of engine revolutions must decrease a little. If this does not happen, it is the faulty valve that is not the cause of increased motor revolutions - it is necessary to replace it.
• Overheating of the engine or a faulty sensor of its temperature in rare cases can also cause larger speed at idle.

Which is necessary to maintain the combustion process of fuel in the cylinders on minimum level, that is, the engine continue to work and not Gloh. On the different motors The idling turnover may differ, and also depend on the temperature of the internal combustion engine. In case of increasing the indicated turns of the XX, the engine begins to spend more fuel, exhaust in this mode becomes more toxic. The lowering of idle turns leads to unstable work power aggregate, as well as to the fact that the motor begins to stall after the release of the gas pedal. In this article, we will talk about what the reason for the high speed of the engine at idle can be the reason why high idling turns on a warm engine are found on many cars, as well as consider the basic ways to diagnose this malfunction.

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High engine speed at idle: injector

The turnover and operation of the motor on the XX actually means that the air is fed into the engine into the throttle bypass. In other words, at idle the specified damper is blocked. It should be noted that the idle course is normal for different aggregates is about 650-950 rpm. In parallel with that frequent malfunction It is that on a heated engine, the turns of the XX are held at a mark of about 1500 rpm and above. Such an indicator is a sign of a malfunction to be eliminated.

It should also be noted such a phenomenon when "floating" idling turnover, that is, for example, increase to 1800 rpm, after which it is dropped to 750 and rises again. Very often increased turnover of XX and floating momentums are the result of the same breakdowns. Let's take a look at the gasoline unit with an injector as an example. In such an engine, the engine turnover depend on the amount of suction air. It turns out that the throttle is preserved, the more air enters the intake manifold. Then determines the amount of incoming air, parallel takes into account the opening angle of the throttle (the position of the throttle valve) and a number of other parameters, after which the corresponding amount of gasoline is supplied.

If the computer does not have accurate information about the number of air due to problems, then the following will occur: the controller will first raise the turnover enriching the mixture (more fuel is supplied). Then, with such a quantity of fuel and an additional amount of air, which does not know the computer, the mixture will be dismissed, and the motor will start working unstable or can almost stumble. In other words, the turnover will begin to fall on too poor mixture. The reduction of revolutions means that the amount of air absorbed by the air unit also decreases. At a certain point, the composition of the mixture (the ratio of fuel and air) will again be optimal, as a result of which the turns will rise again and then start falling or "swim". The reason for such a work of the engine can be failed or working with interruptions. You should also consider the possible air intake climbers.

Another case is such when the engine holds idling speed of about 1500-1900 rpm, while working smoothly, the turns do not swim. In this case, it can be assumed that the injector submits so much fuel in XX mode, which is enough to work at such high revs. In other words, there is a fuel overrun. These features can be characteristic of single engines and absent on others, as there is a dependence on the device of a particular injection system (aggregates with air-circuit meter, motors with a pressure sensor in the intake manifold). Obviously, the air seats is frequent cause Increase the speed of the engine or floating turns on the XX.

Now let's deal with where the excess air can enter the inlet. Looking for a problem in four main directions:

1. throttle;
2. channel XX;
3. device to maintain "warm-up" revolutions;
4. servomotor forced increase in XX;

As for the first case, the opening of the throttle is controlled by the gas pedal. At idle, the motor should work without pressing the accelerator. It should be borne in mind that on many cars the gas pedal is mechanical, that is, it is connected to the opening mechanism of the flap with a conventional cable. If this zakus cable is broken or pulled, and there are problems with the mechanism itself, then there may be a banal effect of pressing the gas pedal. In this case, the engine will keep high speed, as the ECU believes that the driver is rigged to the accelerator and the damper is a bit open.

In the second case, excess air can pass through the idle channel. Such a channel is available on the overwhelming majority. injector DVS. The specified air channel goes to bypass the throttle and is called the idling channel. In the implementation of the scheme there is a special adjustment screw. With this screw, you can change the channel cross-section, increasing or reducing the amount of air flowing into the engine and adjust the turns of the XX.

Another place where air sawmake is possible is a device that supports high speed at idle during HRS warm-up. If simply, there is a separate air channel, which has a solution for its overlap after the engine warming (rod or damper). In the device for overlapping there is a sensitive thermoelement. In many units, the specified element interacts with antifreeze in, like. On the hot engine, the device is triggered in such a way that the stock shifts completely or the flap turns to such an angle to completely block the channel for supplying additional air.

As a result, the ECU is calculated by the amount of air, reduces the amount of fuel supplied and turns down. If the cool motor, this channel is initially open. In this case, the ECU receives indications from the temperature sensor and enriches fuel mixture. Problems with revolutions may occur both as a result of the failure of this device and after failures of the temperature sensor.

Completes the list of special servo equipment - the idling regulator, which is installed in a separate air channel. This solution It is capable of forcibly improving idle turns. In various schemes, it can be an electric motor, a solenoid, option electromagnetic valve etc. The main task of such a regulator is to ensure the smoothness of the engine transition to the XX mode after the release of the gas pedal. In other words, the engine does not sharply resets the turnover after closing the throttle, and gradually. Another function of the device is to increase idle speed at the time of engine start, and then their smooth decrease to the necessary. Also, the regulator raises turns after an increase in the load on the engine in idle mode (inclusion climatic Installation, heating seats or mirrors, long or dipped headlights, overall lights etc.). The failure of this device will naturally entail an increase in or swimming in idling mode.

Increased XX turns on motors with carburetor

At the very beginning, we note that the increase in the turns of the XX carburetor engines Often it is connected with the dosing device itself. If high engine speed at idle is noted in the case of a carburetor motor, then the reasons may be several.

• The first cause is a beatened idle adjustment. Such adjustment is carried out using an adjusting screw that allows you to enrich or drench the mixture. To solve the problem, it is necessary to properly adjust the idling on the carburetor.
• It should also be paid to the fact that the air damper may not be fully opened on the carburetor cars.
• Another place to be paid to the attention is the valve of the first chamber in the carburetor. The specified flap may not be closed until the end due to defects of the damper itself or incorrectly adjusted drive.
• Finally add that in float chamber The carburetor may be observed a noticeable increase in the level of fuel, which also leads to an increase in idle speed.

That in the end

It should be noted that the problem of idling on the engine with an injector is diagnosed by checking the main systems that are responsible for the flow of air in the engine, as well as the change in the composition of the mixture, taking into account the amount of incoming air. It turns out, it should be taken into account that the failure of individual ECM sensors can lead to an increase or floating turnover of XX.

In the general list of the main reasons for which idolotes can increase on the injector, allocate: no power regulator, DPDZ, power unit temperature sensor, problems with the opening of the throttle opening control mechanism, air intake. We add that before in-depth diagnostics, it follows to start the procedure for cleaning the throttle damper, as the dirty choke is a frequent cause of increased revolutions or unstable operation of the motor at idle.

Read also

Why periodically need to clean the throttle. How to clean the damper, learning and adaption of the throttle after cleaning, useful tips.

All motorists sometimes encounter such a problem as increased idling speed. But, unfortunately, the newcomer requires a considerable time to find and eliminate this problem Without a visit to a specialized car service. To do this, you need a detailed guide in which all necessary actions will be specifically described.

When starting the engine can gain higher speed for accelerated warm-up. Especially often it is manifested in winter. But after a while, after reaching the minimum operating temperature The electronic control unit is triggered, which reduces the engine speed to normal value. If this does not happen, then it is necessary to urgently search for the reasons that cause this problem.

Increased turnoves indicate more intensive engine operation, which can lead to a variety of consequences. With long-term operation, the engine temperature can significantly increase, which will lead to a thermal impact. This will lead to a cylinder block. In addition, most nodes will get a strong work out due to unstable work engine and as a result accelerated wear. All this will affect the resource of the engine.

Therefore, it is necessary to immediately understand what reason caused an increase in revolutions. There are several of them:

• idle operation sensor
• problems with angle adjustment in throttle
• engine temperature sensor failure
• air entering the damaged intake manifold
• problems with electronic block Office

Methods of solving problems

Diagnosis of this problem requires some knowledge, since in the process can be affected by irreparable damage to the engine. Therefore, it is necessary to carefully read the operating instructions this car. It is also important to remember that the Niva Chevrolet is installed on the car gasoline engines Injector type, therefore, elevated idling turns on a heated engine are caused by most likely electronic components of the car.

Checking the idle sensor

For this, the engine warms up to operating temperature. Then only to check the sensor using a multimeter. When malfunction must be replaced with a new one.

Throttle position sensor

This component is responsible for the amount of air mixture entering the engine combustion chamber. If the sensor is configured incorrectly, the fuel granted fuel will be harder to detonate, quickly spinning the engine and increasing turns. Checking the sensor is also made using a multimeter.

Problems with throttle valve.

These problems are similar to the failure of the throttle sensor and lead to the same consequences. Only the main problem here is not electronic - and pollution of the damper itself falling out of crankcase with oils, residues of combustion products or due to a rare change air filter. If there are pollution trails, you must clean the damper. To do this, you need to completely remove the throttle knot and either replace it with damage or clean with special means. It is important to remember that after cleaning, an angle of throttle valve may be invalid, due to the so-called "memory effect" in the ECU. In this case, on some models it will be necessary to conduct additional computer diagnostics.

Engine temperature sensor.

This component is most often fails because it is constantly exposed to strong effects. high temperatures. Therefore, in some cases it is better to start finding problems with it. It is also checked using a multimeter. After replacement, it may be necessary to clean the ECU errors.

Damage to the intake manifold.

It may fail and the collector himself, if the car has a sufficiently large resource. But more often fails. In this case, excess air superstar occurs. To solve the problem, it is necessary to dismantle this item, as well as the nodes on which injection elements are located. Before installing the gasket, it is necessary to carefully polish the surface of the collector and clean it from the traces of the old gasket. But it is important to remember that the emergence of this problem is accompanied by not only increased turnover at idle. Damage to the gasket leads to the fact that the engine launch becomes complicated, turns at the time of movement.

As can be seen from practice, there are a very large number of problems that can cause increased idling turnover on a heated engine. So if there are doubts that dIY repair It will not bring the desired result better to entrust the car to specialists who, with the help of professional equipment, will be able to reveal the defect and eliminate it faster.

description

The procedure is the operation of learning the ECM unit of air supply at idle turnover, in which the engine turnover is maintained within the normal range. It must be performed in the following cases:

When replacing the throttle electric drive or ECM block;

When the frequency is turning H.H. or the ignition advance angle differs from the norm.

1. Preparation

Before performing the procedure for training air supply at the turns of H.H. Make sure the following conditions are followed. The learning procedure is canceled if one of them is not respected at least for a moment.

Battery voltage: more than 12.9 V (on the turns of H.Kh.);

Engine coolant temperature: 70-100 "C;

PNP switch in the "ON" position;

Electrical Load Switch: In Position "OFF" (air conditioning, headlights, rear window heater).

On cars equipped with a daytime lighting system, set the light switch to the 1st position to include only small lanterns.

Steering wheel: in a neutral position (corresponding to rectilinear movement);

Car speed: car stands;

Transmission: Fire;

On models with variator and MKP:

Take a trip by car for 10 minutes.

2. Implementation procedure

If an accelerator pedal position sensor circuit has a malfunction, the switching to the diagnostic mode is not possible.

1. Follow the procedure for learning the accelerator pedal position. See above.

2. Perform the procedure for learning the closed position of the throttle. See above.

3. Start the engine and warm it up to normal temperatures.

4. Turn the ignition key to the "OFF" position and leaving at least 10 seconds.

5. Make sure the accelerator pedal is completely released, turn the ignition key to the "ON" position and you will wait 3 seconds.

6. Quickly five times within 5 seconds, repeat the following procedure:

Fully click on the accelerator pedal.

Completely release the accelerator pedal.

7. Look out 7 seconds, fully press the accelerator pedal and hold it approx. 20 seconds, while the MI fault indicator does not stop flashing and light up with a stable light.

8. Fully release the accelerator pedal within 3 seconds after sunbathing the malfunction indicator "M |"

9. Run the engine and let it work on the turns of H.H.

10. Look out 20 seconds.

Go to clause 3.

3. Check the speed of H.Kh. and ignition advance angle

Force the engine two or three times and make sure that the frequency is turning H.H. And the ignition advance angle is normal.

The results of the inspection are normal?

Yes -\u003e End of verification.

No -\u003e Go to clause 4.

4. Determine the faulty component

Check the following:

Check if the throttle valve is completely closed.

Check the PCV valve operation.

Check if there is no air leakage behind the throttle.

The results of the inspection are normal?

Yes -\u003e Go to clause 5.

No -\u003e Repair or replace the faulty component.

5. Determine the faulty component

Engine components and status of their installation cause doubts. Check and correct the flaws.

If after starting the engine, one of the following states occurs, eliminate the cause of the malfunction and re-conduct the procedure for training the air at idle turns from the very beginning:

The engine stalls;

Unstable work on the turns of H.H.

End of verification.

I began to commemorate letters with the problem of large revolutions when starting the engine. Immediately the arrow rises somewhere on 3,000 and after a few seconds it falls to a normal position. We will argue logically. Why do we depend on the engine speed? The turnovers directly depend on the angle of opening the throttle. The larger angle it is open - the greater the engine turnover. Who has the BC, the simpler, they can simply look at the PXX readings and determine whether it is. Who has no BC, it will be necessary to help a friend. It is necessary to put it on the driver's seat, but to open the hood and watch the metal lever associated with the throttle axis (located in the center of the plastic washer, which is attached to the gas cable). You can see in the video on page :. This lever is completely connected to the PCX - idle regulator. Ask a friend to turn on the ignition. The lever must deviate left, open the valve to start. The magnitude of the deviation will depend on the temperature of the engine. If, after the launch, the lever rejected to the left, thereby opening the damper, just 3,000 across., And when the lever is turned off, the lever together with the damper will be covered - it means the case in the RCX. Turns correspond to the position of DZ.

Let's consider another option. Suppose RXH is working. Because of what they can rise turnover? I often go to the forums, looking at what new sores are pop up on our machines. And there is not the right opinion. The question is: "Why are small turns?". And in the answers they write that you need to see all the hoses, there is no trenin and there is no air suction. They write correctly, but only for cars with DMRV - a mass flow sensor. This sensor is placed after the air filter and takes into account the air flow passing through it. And the air subcompriots is already after it, and it is not able to determine it. It turns out that the engine passes more air, and the mixture becomes depleted, which leads to a decrease in revolutions.
. . We still have the opposite. It is worth nation, and it determines the absolute pressure in the intake manifold. If there is a sublicas of air, then he will catch it. It turns out that the damper passes its portion of air, and the sublicas also adds its own. Dad takes into account everything, and turnover rises. And with any scenario, the nozzles are injected so much gasoline as needed to work properly. This is a plus in this. Soon, the ECU will understand that the turnover is overestimated and will give a team on the RCX to cover the DZ - throttle, and everything will be stirred. The next time you start, everything should be repeated. Now let's think from where the excess air can take place, except for bursting hoses. Three systems come to mind, although even 4.

If the piston jested or burst the spring in the PCV valve - the cutter gases, then the air will simply reset, bypassing the flap, through the long hose through the valve cover, through a faulty valve in the air collector.
. . If the exhaust gas recycling system is not corrected, the gases will also go to the air collector through the metal tube. The USR valve is better to immediately shower :.
. . If the adsorber purge valve is not fixed, then gasoline pairs across the tube will also go to the collector.
. . And the last system that is connected to the air collector is a system of changing its length. The actuator itself is the actuator itself, black plastic, looks like a mushroom hat. From above, he has a fitting, and a black tube is connected to it through the rubber tip. Another tube of this system is connected to the air collector itself. In this mechanism itself, there is a membrane - aperture, and if it is torn, the air will come through these tubes to the collector, until the engine exceeds 4,000 revolutions. And then it will simply switch to a short collector and block this circle. Tomorrow we have Monday, I will go to work. I think there will be free time for the experiment. I have a lot of plugs on the fittings intake manifold, Yes, and different diameters. We imitate the air seats and see how the engine will behave. Then exactly learn whether our theoretical conclusions and logical chain are learning. OK, see you tomorrow. I think in the evening the clock to 10 lay out the video and on the blog and on YouTube.
. . Well, everything is ready.