Intensive operation of the car leads to a rapid increase in its mileage. Due to this technical condition the machine deteriorates if its units and elements are not monitored. This applies not only to suspension parts, but also to engine components.
Often motorists have to deal with various faults in the operation of the motor, one of which is the drop in its power. Moreover, this unpleasant symptom, as a rule, manifests itself suddenly. Even yesterday, the car perfectly demonstrated its speed qualities, quickly accelerated and confidently conquered the hills, and today it is not at all distinguished by quickness and agility, because when accelerating, it stopped obeying the gas pedal.
Main reasons
Many owners are racking their brains, inventing the reasons for the drop in engine power. Unfortunately, it is not immediately possible even for experienced specialists to make the correct diagnosis - which is why the engine power has dropped. This fault should be corrected as soon as possible to avoid even more serious consequences and costly repairs.
The main reasons for the deterioration of ICE traction include:
blockage air filter – it is worth noting that to replace the air filter installed deadlines, designed for average operating conditions of vehicles. Many motorists in summer time quite often they get out of the city, where, as a rule, dirt roads. If you are on the road, looking in the rear-view mirror, periodically notice a plume of dust accompanying your car, then be prepared for a freelance filter change.
Trying to save on "consumables", some motorists knock out the air filter and then reinstall it. It is strongly not recommended to carry out such actions. The fact is that when the filter is knocked out, dust particles still remain, settling on its reverse side, and this is fraught with their entry into the engine and premature wear its details.
Electrical interruptions - the control unit is responsible for the electrical part of the machine. He controls the injection fuel mixture, is responsible for its ignition in right moment monitors the performance of all sensors. One of the frequent cases when a car loses its power is when either a too lean or too rich fuel mixture enters the engine cylinders. On the face wrong job one or more sensors. Engine diagnostics will help to deal with the problem, as a result of which the parameters of the mixture will become known, and on their basis conclusions will be drawn about the causes of the malfunction.
If there is a drop in power when the motor is heated, then diagnostics will also help to make the correct diagnosis.
Difficult functioning of the intake and exhaust system - Inevitably, various obstacles encountered in the path of intake and exhaust systems lead to a drop in power. So, to “choke” the engine, in addition to a clogged air filter, destruction in the catalytic converter can.
His internal structure resembles a honeycomb, which over time become clogged and impede the passage of exhaust gases. You can correct the situation by replacing the converter.
Failure of the ignition system - often a decrease in engine power occurs due to the fact that the spark plugs do not supply a spark in time. Ignition delays or advances inevitably lead to interruptions in operation of the internal combustion engine. If you notice not only a deterioration in the power of the car when accelerating, but also a strong vibration of the engine at idling, then the first step is to check the condition of the candles.
If one of them is not working, you need to replace it. However, this does not always solve the problem. Installing a spark plug only temporarily can eliminate a malfunction that will reappear after a few days. Then it becomes obvious that it's not about the candles. The next element that falls under suspicion is a high-voltage wire connected to a non-working spark plug. Probably, it was partially burned out from the inside and returns to service only when working with new candles, without ceasing to spoil them. It will help to fix this kind of damage. new kit BB-wires, after installation of which the cause of interruptions must be eliminated.
Violation of the valve timing - it happens that the camshaft pulley jumps one tooth of the timing belt, and the gas distribution phases go astray, and this causes a sharp deterioration in the ICE thrust.
Air conditioner operation – loss of power can be observed when the air conditioner is turned on. This disadvantage is typical for many vehicles and is especially noticeable in cars that are equipped with liter engines. If the vehicle exhibits good dynamics And fast acceleration then you have no reason to worry.
Engine problems - this may be a malfunction of the hydraulic lifters, burnout of the valves or a violation of the gaps between them.
The drop in power, which occurs gradually, can be caused by a decrease in compression in the cylinders. This is an occasion for a more detailed inspection of the motor and its internal components.
Solving the problem of deteriorating vehicle traction
In any case, the problem of power loss vehicle cannot be ignored. Having made itself felt today, it will progress every day and cause more and more inconvenience and, ultimately, will disable the engine. Timely help to get rid of the malfunction computer diagnostics and a thorough inspection of the machine by a qualified technician.
replacement of spark plugs, high voltage wires, the air filter, of course, can be done on its own, if such a need arose. But if, after installing new parts, the behavior of personal vehicles has not changed in better side, it should be sent for diagnostics to a specialized service, where experienced craftsmen diagnose the cause of the deterioration in the traction of your car.
Video
What determines the power of the engine, see the following video:
An automobile power plant may not develop the necessary power, and the driver pays attention to this, as a rule, when the drop in dynamics is already obvious. It is unlikely that you will not notice this if on a dry, hard and even pavement the car accelerates with great difficulty. What is the reason that the engine power drops, and what can be done in this case?
Signs of low engine power
In essence, if the acceleration time of a car “from zero to hundred” increases by more than 25 percent, and optimal speed reduced by 15% or more clear sign. Undoubtedly, experienced car enthusiasts and without any measurements are able to determine the reduction in power characteristics power unit your 4-wheeled pet. However, in order not to get confused, there is a certain chronometric pattern associated with measuring the “maximum speed” at various speeds. For example, at the 1st speed, the measurement is carried out up to 38 km / h, at the 2nd - up to 52 km / h, etc.
In addition, in order to be able to determine the drop in the power of the power plant at the very beginning of the problem, one must not ignore the secondary signs that indicate this. Let's consider the most common.
How to determine the power performance of the power plant
In the process of diagnosing 4-cylinder internal combustion engines, it is recommended to turn off three cylinders, and use the resulting mechanical losses as a load. If diagnostics of 6-cylinder or more power plants is carried out, additional loading devices are used simultaneously with the shutdown of a certain number of cylinders, which makes it possible to carry out research much more efficiently.
To date, there are various techniques that help the owner independently check the power characteristics of the power unit of his car. For example, install special equipment that can track the slightest changes in the functioning of the internal combustion engine, a drop in dynamics, etc. Only the price of such devices is quite high, and not everyone Russian motorist can afford to buy them.
Note. It is more expedient to put these devices on sports cars, the operation of the internal combustion engine of which requires regular checks.
Fortunately for car enthusiasts, there is a budget option diagnostics. It implies the presence of a computer, a special program and a cable for integration with on-board computer(BC) car. As soon as the driver drives the car for a certain distance at different speeds, the computer will automatically calculate the power of the car's power plant.
Attention. Although this way verification has a considerable share of errors in the testimony; it is widely used by motorists in many countries of the world. The method gives at least general idea about power characteristics.
But still. Only a dynamometer can provide the most accurate indicators. Representing highly professional equipment, it is an indispensable component of any well-known car service.
Checking the Nissan GT-R on the stand (video)
Reasons for the decrease in dynamics
Experts believe that the main reasons for the decline in dynamics are:
Petrol units
As a rule, the reasons for the drop in throttle response on gasoline and diesel internal combustion engines are the same, but there is still a difference. The power of a gasoline power plant implies a ratio with crankshaft speed. Unlike diesel units, power characteristics gasoline internal combustion engines directly depend on the above-described revolutions. The higher they are, the more dynamics the motor produces. And if the engine powered gasoline fuel, for whatever reason, is unable to issue maximum speed, decreases, respectively, its dynamics.
The crankshaft rotation speed decreases for one simple reason: due to overheating of the internal combustion engine. This often happens in the hot season or when driving for a long time in a traffic jam. Obviously, it is highly undesirable to allow the internal combustion engine to overheat.
Some foreign cars are simply not designed for our climate.
There are other reasons for the fall in the dynamics of a gasoline internal combustion engine. For example, an incorrectly adjusted accelerator pedal. elementary reason, however, can significantly affect the efficiency of the internal combustion engine.
Diesel engines
Recently, problems with Japanese diesel engines have often been observed. power plants. It is interesting that after the line of 100 km / h the engine does not give out any problems, but before that it behaves extremely badly: it does not pull uphill, starts badly, etc.
The main reason for the decrease in injectivity in diesel internal combustion engine is the fuel supply restriction. Most experts agree with this opinion. Indeed, this happens in 80 out of 100 cases. Rest secondary problems associated with the difficulties of air leakage, with a frozen fuel pipe (a common problem for Russian drivers), etc.
The next popular reason has to do with injector wear. For example, if a car from a “secondary” plowed its own, its nozzles will definitely wear out. As a result, the machine will smoke a little. This can be repaired, but most drivers sell such equipment, but first they go to the trick to eliminate the smoke and sell the pepelats at a higher price.
Black smoke on a diesel engine is not always as dangerous as on a gasoline engine.
The trick is sometimes associated with adjusting the fuel supply, a kind of "crushing" power. The initial revolutions of XX are restored, the car no longer smokes, but it does not pull either. Checking the “dark horse” is quite simple: you need to return the XX speed to its previous position, if smoke appears, then the nozzles need to be repaired.
Another reason for the decrease in the power characteristics of a diesel internal combustion engine is the jamming of the piston of the distributor timer in the injection pump (fuel pump high pressure). This is especially clearly indicated by the loss of dynamics at high speeds.
It is also noteworthy that it does not always indicate a problem with dynamics on cars with a diesel engine. Any such car, if you fully depress the accelerator pedal or start abruptly from a place, will smoke in black.
On turbocharged DIC cause power drop becomes most often a bad turbine. It is diagnosed by removing the rubber tube from the injection pump. Then carry out the corresponding measurements with a manometer. At speeds up to 4500 per minute, if the turbine is in good condition, the readings should indicate at least 0.5 kg / cm2.
The difference in the reasons for the drop in dynamics can also be due to the difference between the injection and carbureted engine. The table below shows the most common situations in which power does not develop on the injector and carburetor internal combustion engine.
Table: why the power characteristics of the motor fell (injector and carburetor)
| Injection ICE | Carburetor ICE |
| Dirty fuel or air filters | Inadequate opening of carburetor dampers |
| Contaminated filter screen of the fuel pump | Accumulation of dirt in the carburetor and clogged fuel pump fittings |
| Incorrect operation of the vehicle ECU | Drop in pressure or malfunction in the needle valve |
| Accumulation of dirt in the nozzles | Float element malfunctions |
| Malfunctions of the fuel pressure regulator, the main sensors, the operation of which is associated with the engine and breakdowns of the lambda probe | Reducing the capacity of the jet |
| - | Faulty economizer valve |
Poor ICE dynamics due to a catalyst: how to check
The topic of falling dynamics due to a clogged catalyst should be given a separate paragraph. This malfunction is very common among motorists lately, questions about this are often found on the forums.
We will not delve into the thematic jungle regarding what a catalyst is and why it is needed. Consider only the main signs indicating its malfunction. And fall ICE power is not the only symptom.
The main sign, of course, is the light bulb "Check". However, a malfunction of the catalyst is not always detected so easily, in most cases it passes gradually, and the “Check” signal is not displayed immediately. On the other hand, the throttle response of the internal combustion engine decreases, the overall dynamics of the speed increase decreases, and starting is difficult.
To remove the catalyst or not is the choice of the car owner, but it should be remembered that there is nothing “very superfluous” in the car
The reason for the drop in power characteristics can also be clogging of the bobbin combs. It falls because of this throughput catalyst, since the gases that did not have time to pass the catalyst "crush" the power of the power plant.
Note. The honeycombs of the bobbin can not only become clogged, but also collapse or melt over time.
Problems with the catalyst can also be associated with abrasion of the platinum layers. The lambda sensor instantly notices this and gives a signal to the driver.
You can check whether the catalyst is working normally or not by the strength of the gas flow. If it is difficult to block the flow by hand, then everything is fine with the catalyst, and when it is clogged, the flow will be weak.
How to increase capacity in simple ways
Every experienced motorist knows and uses his own, favorite way to improve the former dynamics of the car. Consider the most popular, but let's not forget that only the elimination of the causes that contributed to the drop in power ICE characteristics, will give a guarantee of the return of former positions.
- Use fuel with higher octane rating(OCH). Indeed, the higher the OC, the better the fuel will resist self-ignition during compression. This will directly affect the greater power from the gas explosion.
- The use of "Suprotek". This is a lubricant, which is a composition of several components. This is not an additive or an additive, but a special composition that interacts with metal surfaces internal combustion engine elements. Perfectly helps to eliminate the wear of metal surfaces.
- Replacing the classic air filter with a modernized one. In this way, a richer mixture can be supplied to the engine.
- Exhaust system change. Forward flow increases power.
- Turbocharged.
- Replacement of worn parts and much more.
In a word, it is necessary and possible to bring the engine of your car back to normal. It is recommended to do this in professional car services, but if the driver has specific knowledge and the required equipment - in his own garage.
Modern engines have more power, economical and less polluting environment than those that were before. So when the behavior of your engine changes, it immediately becomes noticeable. When a car "loses power" it says something is wrong. This needs to be investigated immediately, as it may be the cause emergency on my way.
For example: You are damaged brake pads and you didn't notice it. When driving, they can cause a fire in the wheel, as brake fluid is a combustible material. Or, fuel filter, filled with dirt. This can lead to damage to the fuel pump, which will start to work with an increased load. These are two examples of the main causes of loss of power in your car. But there may be other reasons, how to identify them, we will consider below:
Scanning trouble codes - needs to be done if dashboard the engine warning light came on. If not, then proceed to the next step.
So, lit up check engine”, you need to perform self-diagnosis or connect the scanner to the diagnostic connector. It should be noted that the vehicle control system records an error that appears again when the engine is started a second time.
If the engine is running normally, then the existing code may itself be cleared from memory. There are times when the engine feels like something is wrong, and the light does not light up. It's just that some malfunctions cannot be detected by a computer. 
For example: if inlet or exhaust valves are not working correctly, the computer will not detect this, since this malfunction is not related to the sensors.
Checking the air filter- a dirty air filter reduces the air supply to create fuel 
air mixture. This leads to a drop in engine power and increased fuel consumption. Also, the quality of the air filter material affects the operation of the engine. Don't go cheap because possible repair engine can be more expensive. Many stories about how they put not the original or cheap filter, subsequently it broke, and behind it the MAF sensor and the rings on the pistons failed along the chain. To check your air filter, open the hood, remove the filter element from the housing and evaluate the condition. If necessary, replace it.
fuel filterR— under a certain condition, the fuel filter can supply less fuel to the system, and this, in turn, is reflected in the power. To check it, it is necessary to dismantle and drain the remaining fuel. Blow out the filter in the direction of fuel flow in the system. A clean filter blows easily. If it is difficult or impossible to blow through, throw it away without regret and remember that it can ruin your fuel pump.
Check the pressure in fuel system and on the pressure regulator the fuel pump is in the gas tank if you are a happy owner of a car with electronic injection, or on the engine if you still have a car with a carburetor. For many machines, deterioration in performance is associated precisely with fuel pump. Some vehicles have a special connector on fuel line, to check the pressure. If you don't have it, you'll have to apply 
some effort to connect the pressure gauge. You can find the pressure value in the line in your engine. A special regulator is installed in your line, which relieves excess pressure in the line back to the gas tank. It may be incorrectly configured or even leak. It can be checked with an air pump, gradually increasing the pressure to passport. If, before reaching it, the regulator opens, then replace it.
Check the ignition system - what is the ignition timing. What condition are the candles in? high voltage wires. More detailed testing instructions are in the engine. Remember the main thing, do not rely on your own experience or fragmentary knowledge. Having missed any nuance, you can spoil any element of the system. For example, ignition coils.
The sensor of the expense or pressure of air - these sensors help electronic unit engine management determine how much air the engine consumes and how much fuel must be supplied to form fuel-air mixture. If the sensors are faulty, then the computer may incorrectly calculate the amount of fuel, and you eat badly accordingly. But why, then, does the light bulb not light up? The computer is programmed for short circuit or broken sensor. If the sensor does not work correctly, then the computer can only tell you that the fuel system does not have the correct mixture formation and that's it. You will have to find the source yourself. For this there are special guides on the stages of checking components. What parameters should the sensor have, see the manual.
Checking the timing chain or belt the crankshaft and the timing shaft must rotate synchronously, for this they need 
these belts or chains. You just need to match all the marks that you have on the belt and gears. There are times when the belt jumps one tooth or the chain stretches. But with the proper level of service, you will be protected from this scourge.
Examination exhaust system for lock- modern engines are very complex and automakers are trying to make their cars less harmful to the environment. One of the components of such a system is a catalyst installed in exhaust system. For some, it can be located directly near the engine, for 
others, somewhere under the body. But one thing is constant, he is. When using dirty fuel, which is sold in abundance at our gas stations, over time, the catalyst breaks down and blocks the normal flow exhaust gases. You can check its performance either using remote thermometers (the temperature after the catalyst should be slightly higher) or by pressure before and after the catalyst. If you are deprived of such opportunities, then it remains only to remove it and look at the light. If it is clogged, then it is better to replace it, of course, but there are practically no conscious individuals who are ready to part with a large amount of money, they simply knock it out.
Check compression- To do this, you will need a compression gauge with a pressure gauge that you trust to be accurate. Over time, the rings on the pistons grind off and the compression in the cylinders drops, this has its effect on the operation of the engine and its start. However, rings are not the only cause of poor compression. If the mechanism valves 
Timing belts do not fit snugly to their seats, then the result will also be bad. To identify the source bad compression, it is necessary to add a few grams after the first measurement of compression engine oil into the cylinder and measure again. If the compression has risen, then the rings are to blame. If no - valves. True, when measuring compression, your battery must be well charged, otherwise all efforts will go in vain. It is better to screw in the compression gauge instead of spark plugs, than to use a rubber seal. More convenient.
If all of the above points have passed the tests, then it remains only to check the transmission.
Transmission check- sometimes the engine develops enough power, but it doesn't actually reach the wheels. If, while driving, you hear that the engine is running hard, and at the same time you do not feel the cheerfulness of the car, slipping is possible. automatic transmission or side blocking brake system. You can determine this by running the car, when driving on a horizontal section of the road, move the gear selector to position "D" and look at the behavior of the car. If he tries to immediately slow down, then look at the brakes. If not, then you need to think about visiting the service station and checking the machine. Previously, of course, you yourself can, at least conduct a parking test.
To perform the parking test, you will need clear space in front of you and a tachometer. It is necessary to warm up the car engine, then tighten hand brake. Press your foot on the brake pedal and move the gear selector to position "D". Without releasing the brake pedal, press the gas pedal and watch the tachometer reading. If the speed is around 2000 (for cars with a turbine about 2200), then everything is fine. If more / less than this number, then you still have to go to the service station to check the machine. The test is done for a few seconds and then necessary engine to run at idle speed. Clear space in front of you is necessary in case you have bad brakes.
During the operation of the car, many owners face a number of problems. One of them is a decrease in engine power. At the same time, it is not always clear what is the reason for this phenomenon, what measures to take, whether it is worth going to the 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 reducing engine power
1. Malfunction of the crankshaft position sensor
There are situations when the DKPV does not send the control command to serve in time air-fuel mixture. As a consequence, the power power node falls before your eyes. The main reason for the failure is the shift of the gear star in relation to the pulley and the bundle of the damper. In such a situation, it is necessary to carefully inspect the damper and replace it.
2. Increase (decrease) the gap between the electrodes of the candles
During operation, due to the powerful temperature effect, 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 with a round feeler gauge. If the distance is less or more than the allowable one, you need to adjust by bending the side of the electrode or replace the spark plug. As for the optimal distance of the spark gap, it can be different (depending on the type of candle) - 0.7-1.0 mm.
3. The appearance of soot on candles is another clear sign of a problem.
If the engine does not pull well, it is necessary 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 with a brush with a metal bristle. It is important not only to clean the candles or replace them, but also to find out the cause of this phenomenon.
4. Failure of spark plugs
Reduced engine power may be caused by product failure. In this case, it is necessary to check the performance of the candle on a special stand. If the suspicions are confirmed, then the only way out is to replace the set or one candle.
5. There is no gas in the tank
You can diagnose the problem by looking at the fuel gauge. If it is faulty or there is a suspicion of its “inadequacy”, then the presence of fuel can be determined by removing the fuel pump.
6. Fuel filter contamination, water freezing in the system, fuel wire pinching, fuel pump failure
All these malfunctions can be safely attributed to one category, because they all have the same signs- the starter cranks the engine, but there is no smell of fuel from the exhaust pipe. If the car is carbureted, then the cause must be sought in the float chamber. Most likely it is not getting fuel. In the case of an injector, the presence of fuel in the rail is easier to check by pressing a special spool (installed at the end of the rail).
To correct the problem, it is necessary to warm up the engine thoroughly and bleed the power system with a tire pump. After that, all the pipes of the system, hoses and the fuel pump itself are changed.
7. The fuel pump creates too little pressure
Such a problem can only be determined by special measurements (made directly at the outlet of the fuel pump). After that, the quality 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
Low quality contact in the circuit through which the fuel pump is powered or the failure of its relay. The first thing to do to check is to make sure the quality of the "ground" on the car and take resistance measurements with a multimeter. If the resistance level is really high, then the only way out is to strip the contact groups, crimp the terminals well or install a relay (if the old one is faulty).
9. Broken nozzles 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 an open circuit or an interturn circuit. If the cause of the problem is a malfunction of the computer, then such a check can be carried out exclusively at the service station.
There are several ways to eliminate the decrease in engine power for this reason (depending on the depth of the problem) - install a new computer, clean all injectors, ensure high-quality contact in electrical circuit and so on.
10. Breakdown of the DPKV
Breakdown of DPKV - position sensor crankshaft or damage to its circuit. In such a situation, the check engine malfunction lamp lights up. The first thing to do is to inspect the integrity of the DCPV 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 new sensor(if the old one turned out to be faulty).
11. Out of order DTOZH
DTOZH - a sensor that controls the temperature of the coolant is out of order. Symptoms of a malfunction are as follows - the engine malfunction lamp lights up. If there is a break, then the electric fan of the system begins to rotate continuously. In addition, it is necessary to check the health of the sensor itself.
If the engine power has dropped for this reason, then it is necessary to restore the quality of the contact in the electrical circuit and install a new sensor.
12. Out of order TPS
Out of order TPS - a sensor that controls the correct position throttle valve(or its chains). As in previous cases, the “Check engine” lamp lights up here. If there is an open in the TPS circuit, then the engine speed usually does not drop below one and a half thousand revolutions.
The solution is to clean throttle assembly and restoration of the quality of the contact connection in the entire electrical circuit. If the sensor is defective and cannot be repaired, it must be replaced.
13. Out of order DMRV
The DMRV is out of order - the sensor responsible for monitoring mass flow fuel. Here optimal action- checking the integrity of the DMRV or replacing it with a serviceable device. If the failure of the DMRV is confirmed, then it is necessary to make an attempt to clean it, and if it is impossible to repair, simply replace it.
14. Breakage of the knock sensor
Detonation sensor failure. With such a malfunction, the engine malfunction lamp necessarily lights up on the instrument panel. In addition, when DD detonation 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 integrity contact group in the electrical circuit and install a new sensor.
15. Failure of the oxygen sensor
Failure of the oxygen sensor or a violation of its circuit. Such a malfunction is characterized by the ignition of the "Check engine" lamp. In this case, the first thing to do is to check the heating coil for integrity. Firstly, the resistance is measured, and secondly, the voltage level at the output. Measurement can be done 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. In extreme cases, 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 speeds. To solve the problem, it is necessary to replace the exhaust manifold gasket and stretch all the seals.
17. Computer failure
Failure of the electronic control unit (ECU). Despite its reliability, the ECU can also break down (sometimes it just gets lost software). To make sure that the computer is working (failure of the computer), you need to check the voltage on the unit itself (the normal parameter is about 12 Volts) or replace it with a known good block. If the control unit is defective, it may need to be replaced. In some cases, it is enough to change only the wiring.
18. Violation of the adjustment of clearances in the valve drive
You can make sure that the parameters match only by checking with special probes. If the gaps do not correspond to the norm (written in the manual), then adjustments must be made.
19. Deformation or breakage of the springs on the valves
In this case, you will have to remove the cylinder head and measure the length of the springs under load and in a free state. If broken or deformed springs were found, then they need to be changed.
20. Worn camshaft lobes
It will be enough here visual inspection(after removing the necessary elements) and replacing camshaft if necessary.
21. Disordered valve timing
In such cases, it is necessary to check the fact that the labels on the distribution and crankshafts. If there is an "imbalance", then it is enough to set correct position with special labels.
22. Low cylinder compression
Low level compression in all or some cylinders. Causes include probable valve damage or wear, breakage or sticking. piston rings. To verify the 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.
ConclusionThe above list is only a part of the malfunctions, due to which the engine power drops. But in most cases, this is enough to diagnose the problem, fix it, and return it to your " iron horse the much-needed traction.
Modern engines have greater efficiency, power, less pollute the environment. Therefore, when the behavior of the engine changes, it is immediately noticeable. If the car "loses" power, then it says that something is wrong with the car. This should be found out immediately, as it can cause an accident on the way.
If the engine does not pull
Your brake pads are damaged, but you did not notice. When driving, they will cause the wheel to catch fire, because brake fluid is considered a combustible material.
Or the fuel filter is clogged with dirt, this will damage the fuel pump, and it will start working with a heavy load. These are two reasons why a car loses power, but there may be other reasons:
When the dashboard lights up signal lamp with the engine, scan for trouble codes. If it doesn't, go to the next step.
check engine
When the “check engine” lights up, a scanner is connected to the diagnostic connector or a self-diagnosis is performed. It should be noted that the auto control system will record an error when the engine is restarted if it reappears.
When the engine is running normally, the existing code can be cleared from memory. There are times when the engine runs somehow wrong, and the light does not light up. It's simple - the computer does not detect some malfunctions. For example, the OBD-II connector, when the intake and exhaust valves are not working properly, the computer will not be able to determine this, because the malfunction is not related to the sensors.
Checking the air filter. A dirty air/fuel mixture filter reduces the air supply. This leads to an increase in fuel consumption, which reduces the power supply of the engine. The performance of the engine is affected by how much the air filter good quality. Do not chase cheapness, as engine repairs will cost more. It was like when they put cheap or not original filter, then he was torn, and after him, the rings on the pistons, the MAF sensor, failed in turn. To check the air filter, you need to open the hood, remove the filter element from the housing and evaluate its condition. If necessary, replace it.
The fuel filter can supply less fuel which affects power. To check it, it is dismantled and the remaining fuel is drained. Blow out the filter as fuel flows through the system. A clean filter is easy to blow through. If it is impossible to purge or it is difficult to purge, then throw it away without any regret and remember that it will ruin the fuel pump.
At the pressure regulator and in the fuel system, check the pressure if you have an electronic injection car, then the fuel pump is in the gas tank or on the engine if the car is with a carburetor. In many cars, deterioration in performance is associated with a fuel pump. On some cars, there is a special connector for checking the pressure on the fuel line. If you don't have one, connect a pressure gauge. You can find out what pressure value in the line in the manual for the engine. A regulator is installed in the line, it dumps excess pressure back into the gas tank. The gas tank may be leaking or misaligned. Using an air pump, you can check it and gradually increase the pressure to the passport one. When, without reaching it, the regulator opens, it must be replaced.
Check the ignition system, look at the condition of high-voltage wires, candles. detailed instructions How to check is in the manuals for the engine. The main thing to remember is not to rely on fragmentary knowledge or on your own experience. If you miss any nuance, then spoil some element of the system, for example, ignition coils.
The pressure or air flow sensor helps the ECM determine how much fuel to supply and how much air the engine is using to form the air/fuel mixture. When the sensors are faulty, the computer will incorrectly calculate the amount of fuel. The computer is programmed for a sensor open or short circuit. When the sensor is not working correctly, the computer will report that the wrong mixture is in the fuel system. Here is the source for you to find. To do this, there are guides on the stages of checking different components.
To carry out a parking test, you will need to have free space in front of you and have a tachometer. It is necessary to warm up the car engine, tighten the handbrake. Press the brake pedal and move it to position D gear selector. Without releasing the brake pedal, press the gas pedal and watch the tachometer reading. If the speed is around 2000, then everything is fine, for cars with a turbine, about 2200. If the indicators are less or more than this number, then you will have to check the machine and go to the service station. The test is done within a few seconds and the engine should idle. It is necessary that there is free space in front of you, in case the car has bad brakes.
