The idle speed drops. Engine speed does not drop when idling Engine speed drops sharply when driving

While operating a car, drivers have to face various problems. One of the malfunctions, which is quite widespread, is the constant maintenance of high engine speeds. That is, even on Idling Engine speed does not drop. This problem can occur in both injection and carburetor engines, but the reasons will be different. In this article, we will look at what malfunction this problem is a symptom of, and how you can get rid of it.

Table of contents:

How to diagnose that the idle speed does not drop

Even an inexperienced driver can easily notice that the car’s idle speed does not drop. This is easy to determine by ear, since, as is known, the lower the speed, the quieter the engine runs. In addition, if the car is equipped with a tachometer, it can be used to determine the number of revolutions per minute at a particular point in time.

Depending on what engine is installed in the car, the idle speed may vary. On average, an engine is considered to be operating normally when the idle speed is between 650 and 950 rpm. If the speed is higher (unless otherwise stated in technical passport to the car), then this can be called a deviation.

Please note: On most cars with fuel-injected engines, the “Check Engine” light on the dashboard will come on at high idle speeds.

What are the consequences of high idle speed?

The first thing a driver should remember is high flow rate fuel at high speeds. Accordingly, if high speeds remain at idle, this means that part of the fuel “flies into the pipe.” Moreover, this problem directly affects the life of the engine, which suffers as a result of such a malfunction. The node itself, which led to the occurrence of the malfunction in question, may also suffer. That is why, if this problem is identified, it should be eliminated as soon as possible.

Why does the idle speed of a carburetor engine not drop?

At the moment, carburetor engines are practically not used in modern cars. However, it is necessary to consider why high idle speed may be a problem in such engines, since most of the problems overlap with fuel-injected engines. If such a malfunction occurs, you should pay attention to the following elements:

Most of the problems that lead to high idle speeds are discussed above. carburetor engine. It also cannot be ruled out common problem for carburetors and injectors - jamming of the gas pedal.

Why does the idle speed of an injection engine not drop?

Now let's look at the malfunctions that lead to increased idle speed in injection engine. Unlike carburetor engines, where all problems are of a mechanical nature, a malfunction in an injector can be associated, among other things, with improper operation of the electronics. The main reasons are as follows:

As you can see, there are quite a lot of problems due to which the idle speed does not decrease. If such a malfunction occurs, you should begin to find its cause as quickly as possible in order to prevent even more serious problems.

A drop in engine speed is quite an unpleasant incident for your car. It's about not only about inconvenience and questions about the serviceability of the machine, but also about the operation of important mechanisms. The problem is that a sharp drop in idle speed, when the car rolls into neutral, can shut down the engine, and this already becomes dangerous for further movement. The driver may not notice such an incident, engage second gear and release the clutch, which will cause sudden engine braking. The car can start “from the pusher” in this way, or it can simply stop, which will create an emergency situation. When the car warms up, a drop in speed also has an unpleasant effect on the driver's confidence. You have to constantly apply the gas with your foot or use other methods to keep the engine running. It is worth understanding the causes of the problem.

So, why do the revs drop when warming up on cars with a carburetor? You can find many common reasons that unite owners of both a certain car model and a specific type of carburetor. It must be said that today cars with this type of fuel injection are no longer produced. This is not the best solution, since the carburetor is very sensitive to the quality and purity of the fuel, requires maintenance quite often and does not serve very well in different applications. climatic conditions. This type of gasoline injection requires stability, but in our operating conditions it is simply impossible to provide such luxury to a car. Therefore, various problems arise that can lead to significant discomfort and even danger when traveling by car. Today we will look at the main reasons for a sharp or wave-like drop in speed when warming up on cars with carburetor fuel injection.

Perhaps it's not a technical issue, but a refueling issue?

As mentioned above, the carburetor is very sensitive to the quality of gasoline that you pour into the car’s tank. If there are any specks or impurities, the equipment will not be able to work properly. Dirty gasoline is cleaned by a filter for a certain time, but over time such cleaning ceases to help. Fuel containing impurities and inclusions may be big problem, which affects not only the speed. Here are a few important indicators this problem:

within a few kilometers after refueling with low-quality gasoline, you will feel changes in the dynamics of the car, fuel consumption will increase and stability will deteriorate;
The engine idle speed may fluctuate, and this will indicate an unstable composition fuel mixture, at speed, small jerks and dips in the traction of the unit are also possible;
after the engine has cooled down, the next time you start it, warming up may start unexpectedly from low speeds, you will have to play with the choke in unusual ranges to warm up;
It is also quite possible that after warming up to 30-40 degrees, a dip will occur, which will need to be compensated by pulling the choke all the way or applying the gas with your foot;
when warming up to operating temperature the engine will operate relatively stably, but the speed will remain floating, these are precisely the indicators of low-quality fuel in the car’s tank.

These criteria indicate that it is better not to go to your usual gas station anymore. Of course, the same problems are possible if the carburetor fails and needs servicing. But often these problems occur precisely with low-quality fuel with low octane number or with impurities. Therefore, the first thing to do is to pump out the gasoline on a warm engine and add good, proven fuel to it.

It's time to service the carburetor - minor defects

The reason for the drop in speed during warming up can also be minor breakdowns in the carburetor system. These are torn membranes, dislodged cable fastenings or a sticking damper drive. Such troubles can be cured during an inspection of this device. In the old days, every second car driver could independently rebuild the carburetor, install a repair kit and drive on, listening to the contented rumbling of the unit. Today the repair principle is as follows:

you should go to a car store or market to find a suitable repair kit for your type of carburetor; it is better to take original high-quality parts;
Next, it is important to find a master who is well versed in carburetors and can help with troubleshooting problems in your device; there are fewer and fewer such masters in cities;
In a few tens of minutes, a specialist will go through the equipment, find the problem and install new gaskets, membranes, seals and other products from the repair kit;
Next, you need to check the equipment to make sure there are no unpleasant effects; often this can only be done the next day on a cooled car;
the last step is regular visits to the technician once every 2 years for maintenance and inspection of the carburetor, this will keep the car in normal working condition for a long period.

Carburetor fuel injection has its advantages. You will have to pay a fortune for maintenance and cleaning of the injector. But carburetor repair, even with the replacement of certain parts, will not cost too much. But to get these benefits, you should find a technician who is well acquainted with the features of your particular car model. Such a specialist will help you fix all the problems and continue to operate the machine without problems.

Condensation or dew point - is this possible?

On VAZ 2107 cars, engine speed often drops when warming up to full stop unit. This problem is typical for all carburetors except Solex. The problem is that at temperatures from 0 to +5 degrees, condensation can accumulate in the carburetor chambers. This is a certain type of dew that forms when temperatures change. After starting the engine cold, the following process occurs:

first, the open choke starts the enriched mixture, which burns without problems and does not cause noticeable changes in the operation of the power unit, which is very important for normal starting;
as the car warms up, the owner lowers the choke, the mixture approaches the working characteristics, and the entire engine system is already slightly warmed up, and this is where the fun begins;
condensation or dew begins to enter this mixture and change its properties; in some models of devices this happens quite quickly and unpleasantly, causing the motor to stop;
the driver pulls out the choke again or presses the gas pedal, the mixture becomes richer, the engine runs normally, but up to 60-70 degrees this process can be repeated endlessly;
after warming up to approximately operating temperature, everything returns to normal, the speed returns to normal, the engine runs well, so the technician will not find anything when visiting the station.

It’s hard to even imagine how to deal with such a situation. The only effective way would be to replace the carburetor with a Solex, but even these models often have problems starting the power unit at transition temperatures. So give any specific advice in in this case not easy. It is best to service equipment on time and always maintain fuel equipment in good condition, this will help to obtain proper reliability of the machine.

Are there any other reasons for the sharp drop in revolutions?

There can be many reasons for such trouble. If you are repairing a car yourself, you should take a slightly broader look at the problem and try to find the causes in other components. But you should move on to other features of the car only if you are convinced of the high quality of the carburetor, normal fuel and other features mentioned above. Here are some more ideas to check out:

fuel filters - very often filter elements become clogged, and owners forget to change them on time, and this leads to serious problems with the vehicle;
thermostat - perhaps after a slight warm-up of the small circle, your thermostat opens and releases sharply icy liquid into the engine, which leads to a drop in speed;
electronics - it is worth checking the ignition, the normal installation of the timing belt, the absence of problems with sensors and various electronic equipment on board your car;
turning on electricity consumers - perhaps some powerful device is automatically turned on in your car, which puts a load on the unit, the speed inevitably drops;
valve system - there will be no sharp drops and drops in this case, but floating and unstable speeds are quite possible, and under load they will turn into drops.

There can be many reasons for engine instability. Sometimes the problem is that the generator at a certain point stops producing normal voltage, which affects the operation of the engine's electrical systems. The engine may also be stressed due to poor oil or internal failures in the cylinder block or valve system. So in this case, you can dig for quite a long time, but it is better to visit a service station and find the cause of the problem.

We invite you to watch a video with the solution to one of the possible reasons this problem:

Let's sum it up

There are dozens of types of breakdowns that lead to a sharp or gradual drop in speed on carburetor cars. But the question is that the equipment turns out to be quite demanding in terms of maintenance, so all the reasons have to be eliminated together. If you always encounter such a problem, it means that this is a specific operation of the carburetor installed in your car. Most likely, only replacing the device will help get rid of the troubles. If the problem only occurred a few times, it’s worth trying to service fuel system, replace the filter and install a new carburetor repair kit.

Cars with this type of injection are gradually giving way to injection systems. They are more reliable, more economical, last longer and do not cause such troubles as carburetors. Of course, there are also many subtleties and features in direct injection that should be kept in mind. But changing a carburetor to an injector is too labor-intensive and expensive. It is better to properly maintain your equipment and ensure its normal operation. Even with very good service, after 1-2 years you will have to go to the service again. Have you ever experienced a sharp drop in engine speed when warming up?

During the operation of a car, many owners face a number of problems. One of them is a reduction in engine power. At the same time, it is not always clear what is the reason for this phenomenon, what measures to take, or whether it is worth going to a service station. Let's talk about the main reasons why the engine does not pull and how you can fix the problem on your own.

The main reasons for the reduction in engine power

1. Malfunction of the crankshaft position sensor

There are situations when the DCPV untimely sends a control command to supply the air-fuel mixture. As a result, the power of the power unit drops before our eyes. The main cause of the failure is the shift of the toothed star relative to the pulley and the delamination of the damper. In such a situation, it is necessary to carefully inspect the damper and replace it.

2. Increasing (decreasing) the gap between the spark plug electrodes

During operation, due to strong temperature effects, the distance between the electrodes of the spark plug may decrease or increase. To exclude or confirm your suspicion, you need to check the size of the gaps using a round feeler gauge. If the distance is less or more than acceptable, you need to make an adjustment by bending the side of the electrode or replace the spark plug. As for the optimal spark gap distance, it can be different (depending on the type of spark plug) - 0.7-1.0 mm.

3. The appearance of carbon deposits on the spark plugs is another clear sign of a problem.

If the engine pulls poorly, you need to unscrew all the spark plugs one by one and inspect them. If obvious carbon deposits appear on the electrodes, the device must be cleaned using a brush with metal bristles. It is important not only to clean the spark plugs or replace them, but also to find out the cause of this phenomenon.

4. Failure of spark plugs

A decrease in engine power may be caused by product failure. In this case, it is necessary to check the performance of the spark plug on a special stand. If the suspicions are confirmed, then the only way out is to replace the set or one spark plug.

5. There is no gasoline in the tank

You can diagnose the problem using the fuel level indicator. If it is faulty or there is a suspicion that it is “inadequate,” then the presence of fuel can be determined by removing the fuel pump.

6. Fuel filter contamination, water freezing in the system, pinched fuel wire, fuel pump failure

All these malfunctions can be safely classified into one category, because they all have the same symptoms - the starter cranks the engine, but the smell of fuel comes out exhaust pipe No. If the car has a carburetor, then the reason must be sought in float chamber. Most likely, fuel is not supplied to it. In the case of an injector, it is easier to check the presence of fuel in the ramp by pressing a special spool (installed at the end of the ramp).

To correct the problem, you need to warm up the engine thoroughly and bleed the power system with a tire pump. After this, all system pipes, hoses and the fuel pump itself are changed.

7. Fuel pump produces too little pressure

This problem can only be determined by special measurements (taken directly at the outlet of the fuel pump). After this, the quality of operation of the fuel pump filter is checked.

The solution is to clean the fuel pump filter, replace it (if repair is not possible) or install a new fuel pump.

8. Poor contact quality in the circuit

Poor contact quality in the circuit that powers the fuel pump or failure of its relay. The first thing you need to do to check is to make sure the quality of the “ground” on the car and measure the resistance using a multimeter. If the resistance level is really too high, then the only way out is to clean the contact groups, crimp the terminals well, or install a relay (if the old one is faulty).

9. Failure of injectors or malfunction in the supply system

If there is a suspicion of failure of these elements, it is necessary to check the resistance of the windings with a multimeter for the fact of a break or an interturn short circuit. If the cause of the problem is a malfunction of the computer, then such a check can only be carried out at a service station.

There are several ways to eliminate a decrease in engine power for this reason (depending on the depth of the problem) - install a new ECU, clean all injectors, ensure good contact in the electrical circuit, and so on.

10. Failure of the DPKV

Failure of the DPKV - position sensor crankshaft or damage to its circuit. In such a situation, the engine malfunction lamp comes on. Check engine" The first thing to do is to inspect the integrity of the DCP itself, make sure that the gap between the ring gear and the sensor is normal (it should be about one millimeter). The normal resistance of the sensor coil is about 600-700 Ohms.

To solve the problem, it is enough to restore normal contact in the electrical circuit and install a new sensor (if the old one turns out to be faulty).

11. DTOZh is out of order

The DTOZH, the sensor that monitors the coolant temperature, has failed. Symptoms of the malfunction are as follows: the engine malfunction lamp comes on. If there is a break, the system’s electric fan begins to rotate continuously. In addition, it is necessary to check the serviceability of the sensor itself.

If engine power has dropped for this reason, then it is necessary to restore the quality of contact in the electrical circuit and install a new sensor.

12. TPS is out of order

The TPS sensor, which monitors the correct position of the throttle valve (or its chain), has failed. As in previous cases, the “Check engine” lamp comes on here. If there is a break in the TPS circuit, then the engine speed usually does not drop below one and a half thousand revolutions.

The solution to the problem is to clean the throttle assembly and restore the quality of the contact connection throughout the entire electrical circuit. If the sensor is faulty and cannot be repaired, it must be replaced.

13. The mass air flow sensor has failed

The mass air flow sensor, the sensor responsible for monitoring, has failed mass flow fuel. The optimal action here is to check the integrity of the mass air flow sensor or replace it with a working device. If the failure of the mass air flow sensor is confirmed, then it is necessary to make an attempt to clean it, and if repair is impossible, simply replace it.

14. Failure of the knock sensor

Damage to the knock sensor. In the event of such a malfunction, the engine malfunction lamp necessarily lights up on the instrument panel. In addition, if the motor fails, there is no detonation in any of the operating modes of the power unit and the engine power also drops. With such a problem the best option– restore the integrity of the contact group in the electrical circuit and install a new sensor.

15. Failure of the oxygen sensor

The oxygen sensor is broken or its circuit is broken. This malfunction is characterized by the “Check engine” lamp coming on. In this case, the first thing to do is check the heating coil for integrity. Firstly, the resistance is measured, and secondly, the voltage level at the output. The measurement can be made even without breaking the circuit - just pierce the insulation with needles.

To eliminate the malfunction, it is worth repairing the oxygen sensor, restoring the quality of the wiring and cleaning all the holes through which air is sucked in. As a last resort, it is necessary to replace the oxygen sensor itself.

16. Depressurization of the exhaust system

Diagnosing such a problem is simple - just inspect the main elements while the engine is running at medium speed. To solve the problem, it is necessary to replace the exhaust manifold gasket and tighten all seals.

17. ECU failure

Failure of the electronic control unit (ECU). Despite its reliability, the ECU can also break (sometimes it simply gets knocked out software). To verify the serviceability (failure of the ECU), you need to check the voltage on the unit itself (the normal parameter is about 12 Volts) or replace it with a known-good unit. If the control unit is faulty, it may need to be replaced. In some cases, it is enough to change only the wiring.

18. Improper adjustment of clearances in the valve drive

You can verify the compliance of the parameters only by checking with special probes. If the gaps do not meet the standard (as stated in the manual), then adjustments must be made.

19. Deformation or breakage of springs on valves

In this case, you will have to remove the cylinder head and measure the length of the springs under load and in the free state. If broken or deformed springs are found, they need to be replaced.

20. Camshaft cams are worn

Here a visual inspection (after removing the necessary elements) and replacing the camshaft if necessary will be sufficient.

21. Valve timing is out of order

In such cases, it is necessary to check whether the marks on the camshaft and crankshaft match. If there is an “imbalance”, then it is enough to establish the correct position using special marks.

22. Low level of compression in cylinders

Low level compression in all or some cylinders. Reasons include possible damage to the valves or their wear, breakage or obstruction piston rings. To verify suspicions or refute them, it is enough to make the necessary measurements. If the suspicion is confirmed, then it is necessary to repair the power unit - change the rings, pistons or repair the cylinders.

Conclusion

The above lists only some of the faults that cause engine power to drop. But in most cases, this is enough to diagnose the problem, fix it and return much-needed traction to your “iron horse”.

Many motorists have experienced the effect of a drop in idle speed on their car. Often, this leads to the engine stalling altogether. This effect has many causes that need to be addressed urgently so as not to cause even bigger problems.

For what reasons does the turnover drop?

Many car enthusiasts do not pay attention to the condition of their cars, much less the engine. Often, the consequences can be expressed in malfunctions that develop into major renovation, which will draw a significant amount of money. It is for these reasons that if a malfunction occurs with the engine, it is necessary to return it to normal functionality.

So, let's look at the main reasons that lead to low idle speed:

The adjustment of the “quantity” and “quality” screws is broken

A common cause of low idle speed on Ozone carburetors. Often, tightening the fuel adjustment screws is enough to restore normal speed.

Fuel level is incorrectly adjusted

In addition to a drop in engine speed at idle, this leads to a drop in power. The engine may stall or start after much suffering. Long-term operation on lean fuel can lead to engine failure.

Foreign air enters the carburetor

The “suction” of excess air can interfere with engine operation. Another option is contaminated air filter and not enough air gets in.

Poor quality fuel

Engines designed to consume high-quality fuel may malfunction or fail if they are “fed” with lower quality fuel, for example, 92 instead of 95. Moreover, the engine may encounter a lot of new problems that will have to be solved, so it is better to use good gasoline.

Crashes on-board computer

It also happens that the on-board computer begins to show inaccurate data. If everything seems to be fine with the engine, but the electronics persistently indicate that there is a problem, you can try to connect a working BC and check it on it.

It's time to change the spark plugs

Determining the cause of the malfunction

Help in determining the reason why you fell idle speed, the following steps will help.

If there are no additional signs of a drop in speed (for example, vibration), you can check the engine on another on-board computer.
Check sensors.
Inspect the spark plugs.
Make sure fuel and idle levels are adjusted correctly
Make sure that excess air is not “sucked” into the carburetor.
Inspect the air filter for contamination.

Approaches to solving the problem

When all the causes have been identified, you can proceed to troubleshooting. Of course, there are a different number of ways to solve the problem, but do not forget that a certain sequence of actions is necessary. It is worth considering the issue in more detail.

Adjust fuel level and idle speed

Adjusting the idle speed on Ozone carburetors. You will need a tachometer and a slotted screwdriver. Work must be carried out on a warm engine. By turning the “quantity” screw in the clockwise direction, you can achieve an increase in speed.

If it is not possible to solve this problem with one “quantity” screw, you need to connect a “quality” screw, which, if it has not been used yet, may have a factory plug on it. It can be pulled out by screwing a suitable screw into the plastic and pulling it out.

Adjustment is usually carried out in 2-3 (several) passes.

Replace spark plugs

Even if the spark plugs have recently been replaced, they may be of poor quality or defective. Original spare parts are always better than cheaper analogues. A falling XX often hints at this malfunction.

Change fuel

Using sensors, it is necessary to check the pressure in the fuel supply system and the presence of contaminants. After which you need to change the fuel to a cleaner and higher quality one. As a last resort, you should consider refueling at a gas station of another company.

Check air and fuel filters

The air filter may be dirty. As the filter becomes dirty, the amount of air entering the engine decreases. Engine power decreases and fuel consumption increases significantly.

The air filter needs to be cleaned or, more importantly, replaced. It is best to carry out this procedure in advance to avoid other problems in the future.

Clean the idle speed sensor

If oil and other contaminants enter the sensor, it will fail. The sensor is cleaned with carburetor cleaner and aerosol liquid. The device must be removed and washed. The aerosol liquid gently cleans the needle. Be careful that liquid does not get into the inside (that is, under the spring), to avoid its failure.

Conclusion

A drop in engine speed is a fairly common problem. It can happen not only for any one reason - when the engine wears out severely, an integrated approach is required, and the breakdowns can be quite specific. In this case, you may need to seek professional help.

It is necessary that all powertrain systems work 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.

In this article we will talk about why engine speed does not drop, and also consider the main reasons why such problems arise in cars.

Read in this article

When releasing the gas, the speed is increased or “freezes”: common malfunctions

Let's start with the fact that on many cars with an injector, the speed rises during warming up. This is necessary in order to power unit worked stably after a cold start.

However, after the temperature rises, the control unit reduces the idle speed, bringing it to normal. On many cars with a carburetor, the driver independently increases the speed during warm-up, using the so-called “choke”.

Moreover, after the engine is warmed up, the normal idle speed is, on average, 650-950 rpm. If you press the gas and release the accelerator, the speed should increase, and then drop again to the specified values.

Also, a situation often arises when the speed drops slowly or is constantly kept at around 1.5 thousand rpm, 2 thousand revolutions, etc. Naturally, in such cases, consumption increases and the internal combustion engine wears out more, which indicates the need for diagnostics.

So, let's start with common carburetor problems. Often the engine speed does not drop due to problems with the throttle valve. For example, when the driver steps on the gas, the throttle must be opened wider to allow more air to enter the cylinders to burn fuel. After the gas pedal is released, the throttle closes and the speed decreases.

If the damper does not close completely, an over-enriched mixture enters the cylinders, and the speed is increased. The cause may be severe contamination of the throttle assembly or damage to the valve itself (deformation). First you need to clean the damper; carburetor cleaning liquid is suitable as a cleaner.

We also note that the damper does not close tightly even when the drive cable is worn out. In this case, the cable must be replaced. On carburetor cars, engine speed often does not drop even if the gasket between the carburetor has failed. The culprit may also be intake manifold which is damaged.

The main task is to find the correct ratio of fuel and air. Often high level fuel in the carburetor float chamber also leads to increased speed. The check should begin with the needle valve.

Now let's move on to the injector. Please note that on many injection cars. As for problems, the injection system itself is more complex, that is, there are more reasons for high speeds compared to the carburetor.

As a rule, problems with speed can be caused by problems with both mechanical elements and electronic components. In the list of main malfunctions, experts highlight malfunctions of the coolant temperature sensor, which is installed in.

In simple words, if the specified sensor gives an incorrect signal, the ECU considers that the engine is cold and activates the warm-up mode. In this case, the control unit raises the speed so that the power unit operates stably and reaches operating temperature faster.

Also, problems with speed can begin due to malfunctions and malfunctions (idle speed regulator). It also happens that the throttle cable gets stuck and becomes wedged. Another spring that closes throttle valve may become stretched or damaged.

Special attention should be paid to gaskets, since air leaks can lead to disruption of mixture formation. This means that you need to separately inspect manifold gaskets, injector seals, etc.

Floating speed: reasons

Note that in some cases the revolutions do not just slowly fall or remain at the same level, but “float”. In this case, the engine may become unstable. first they fall, then they increase sharply and everything repeats. A common cause of this phenomenon is the supply of excess air, which leads to “jumps” in speed at idle.

Such problems arise if the air supply sensor () fails, which allows the ECU to calculate how much air is supplied and how much fuel is supplied to prepare the required mixture.

If malfunctions occur, the control unit cannot prepare the “correct” mixture for the idle mode, which causes speed jumps after releasing the gas pedal or when the engine is idling.

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, it is often necessary to clean and adjust the carburetor itself, while the injector will require.

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

The most complex situation is one when it 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 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.