Poor new engine. The fuel pump generates too little pressure

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

you got damaged brake pads and you didn't notice. When moving, they will cause the wheel to ignite, because brake fluid considered combustible.

Or covered in mud fuel filter, this will damage the fuel pump, and it will start to work with a large load. These are two reasons why a car loses power, but there may be other reasons:

When on 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, an OBD-II connector when the intake and exhaust valves do not work properly, the computer will not be able to determine this, because the malfunction is not related to the sensors.

Checking the air filter. Filthy air filter for creating fuel-air mixture 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 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, check the condition 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 break 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 hand brake. 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 run for idling. It is necessary that there is free space in front of you, in case the car has bad brakes.

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Why is the engine not picking up the speed it needs to correct operation? This is a question many drivers ask themselves. During the operation of engines different type, they often encounter a situation where, when you press the gas pedal, the engine does not react in any way and does not gain the necessary speed.

Often such problems occur with cars equipped with LPG, although when switching to gasoline, the problem disappears. Malfunctions of a different plan can entail both fairly serious repairs and simple preventive measures. Let us consider in more detail why the engine is gaining momentum poorly, both on gasoline and diesel fuel.

In the first case, it is very important to try to analyze under what conditions this happened and how it manifests itself. Be sure to try to identify all the accompanying symptoms.

Failure of a fully serviceable internal combustion engine to gain the necessary speed after service work or repair is usually the result of incorrect assembly, connection errors, etc. such situations allow you to instantly determine the malfunction by inspecting or returning the car to the repair station.

Possible reasons why the engine does not develop speed are conditionally divided into categories. First, let's deal with simpler, one might say minor malfunctions. Kit the right indicators when driving, it very much depends on the usefulness of combustion, the composition of the mixture, the efficiency of supplying it in the right volume and timely ignition.

One of common causes, according to which the revolutions cannot be gained to the desired value - disrupted operation of the ignition, fuel and air supply systems:

1. Significant pollution air filters reduces the possibility of air penetrating through the filters. The engine in such a situation starts to work unevenly, loses power, as a result of which it will not be able to gain momentum. One of the common reasons is the appearance of branches, dirt, bags, etc. in the air filter;
2. You need to pay attention to the suction for the intake of excess air. The problem may arise unexpectedly, or as a result of gradual progress. Working on a strong suction, the motor is very difficult to gain momentum. The proportions of fuel and air in the fuel-air mixture deviate significantly from the normal value. The resulting mixture is very lean for gasoline and rich in air. An engine with such a mixture starts without problems, but will not run smoothly and will not be able to pick up speed at the slightest movement;
3. The unit does not receive enough fuel. Usually, the culprit is a filter, which can easily become clogged with foreign objects. Usually problems with ICE launch does not occur, since the fuel level is normal, but the car twitches, does not respond in time to manipulations with the gas pedal. Turnovers may not reach the level of a certain tachometer mark;
4. A dirty filter mesh on the fuel pump, since over time the formation of plaque on it from the tank is a natural process. The lack of the required pressure in the system leads to a drop in pump performance. Normal operation of the motor is impossible in different modes: the engine will pick up, it needs speed and immediately stall due to clogging of the mesh;
5. Disrupted operation of wires and candles makes ignition problematic combustible mixture. The process of ignition of the fuel charge is untimely, the power drops, respectively, the speed will not increase. The cause of these manifestations is usually pollution and oiling of candles, damage to its body, gaps during installation on the electrodes;
6. Trouble of the engine due to breaks in high-voltage wires, misfiring of the ignition moment, worsened dynamics of the set of internal combustion engines revolutions.

Serious problems that require a certain level of skill, knowledge and special equipment or contacting a service station. It will no longer be about consumables, namely the details:

• Perhaps the most important reason is the disturbed phases of the timing. The balanced operation of the gas distribution mechanism is disrupted due to the untimely opening of the valves. Such troubles usually appear after unsuccessful attempts to replace the timing belt, especially when jumping teeth. Also, the causes include valves that are incorrectly adjusted, malfunctions in the valve timing, and even a breakdown of the timing drive;
• Disrupted operation of the incendiary module and coils. Misfiring becomes commonplace, and the engine simply cannot achieve the necessary normal operation revolutions;
• Worth paying Special attention to power the injectors on the injector. The control signal does not act on the nozzle, or it occurs intermittently due to incorrect operation wiring;
• Violations in the operation of the gasoline pump, and if the diesel engine, then the injection pump. The problem develops gradually, it all starts due to a gradual weakening of the ability to pump fuel, and as a result - a lack of pressure. As a result, when the engine is heavily loaded, it will start to stall more and more often;
• The problem of injector contamination occurs when units operate with fuel extremely Low quality. Be sure to clean the nozzles at least 30 thousand;
• Incorrect operation of sensors electrical system can even affect the composition of the combustible mixture.

What is the result?

Given all the problems with the fact that the internal combustion engine is slowly gaining momentum, it would be advisable to conduct a diagnostic check for errors as soon as possible. As a matter of urgency, such a procedure must be carried out in the case when the “check” on the tidy lights up.

Rarely, there are cases when the engine does not develop speed due to the failure of the computer. Such troubles can arise due to negligent diagnostic service firmware.

The result of such an intervention is an inadequate perception of the ECU speed: low are taken for high, and vice versa. Max Power ICE can be obtained subject to the timely completion of all maintenance work provided by the manufacturer and other equally important service activities.

VAZ-2114 cars, from the beginning of production, are equipped with eight-valve engines with a volume of 1.5 liters. Since 2007, eight valve engine 1.6 l., having environmental class Euro4. The operation of the car, sometimes not correct, over time presents "surprises". not on full power, traction decreases. Let's try to understand the causes and methods of elimination.

The dynamics of the car, first of all, depends on the stable and stable operation engine. When the indicators of this characteristic decrease, this indicates that there are problems in the operation of the engine.

Engine VAZ-2114

Unstable operation of the engine is caused by the following:

• The fuel filter has become dirty.
• The fuel pump diaphragm is clogged.
• Or do not work.
• Insufficient.
• On-board computer fails.
• The nozzles are clogged (they need to be cleaned or).
• The clutch disc has worn out.
• Malfunctions in the operation of sensors that control: position crankshaft, ; coolant temperature; ; detonation.

This is just a part possible causes because of which the engine can pull badly over the entire rev range.

It is worth mentioning the fuel pump, which fails. The real state of affairs is determined by detailed diagnostics.

A brief analysis of the causes and their consequences on the VAZ-2114

1. Filter clogging fine cleaning . determined visually. Debris particles present in fuel tank, gasoline, accumulate in the filter, the channels are clogged. Fuel supply is insufficient. "Treatment" - .

   

   Changing the fuel filter

2. Fuel pump diaphragm clogged . The reason is the same, there are particles of dirt in gasoline. Solved by excavation, washing, blowing with compressed air

   

   We change the grid of the fuel pump

3. Air filter clogged . For a short time, it is solved by blowing the filter, you can knock on a hard object. Ideally, the filter is replaced with a new one.

   

   Clean or change the air filter

4. Spark plugs not working or not working . Determined by inspection, after twisting. One of the reasons - . The gaps are checked with a feeler gauge, the necessary one is set. To do this, the side electrode is bent to the desired value.

   

   Checking the gap between the spark plug electrodes

5. Formed. The electrodes are cleaned with sandpaper (zero), cleaned, the gap is checked.

   

   Cleaning spark plugs

6. The serviceability of the spark plugs is checked on a stationary stand. If problems occur, it must be replaced.

   

   Candles are best checked at a stand in a car service

7. Insufficient compression in the cylinders . This defect appears as a result of high wear cylinder-piston group. The result is increased consumption oil, incomplete combustion of the combustible mixture, gasoline enters the crankcase. In some cases, it is enough to replace the piston rings, in others it is necessary overhaul engine.

   

   We measure the compression in each cylinder

8. Failure or breakdown electronic block management . Without special knowledge it is impossible to repair. Diagnostics is carried out with special devices. A flashing is possible, or the control unit is completely changed.

   

   We carry out diagnostics of the control unit

9. Clogged nozzles . . There are additives in the fuel, but they do not give a special effect. Replacement may be required, so check out the material: "".

   

   You can clean the nozzles at home

10. Clutch disc worn out . In motion, with an increase in speed, the car does not gain desired speed, slippage is felt. Expertly checked by starting off in fourth gear. If it stalls, everything is in order with the disk, if the engine is running, then there is a problem. Solved by replacing the clutch disc.

    

    If the clutch disc is worn, we replace it

11. Sensor failures . There is often a break in electrical circuits. This is the field of activity for electricians. The state of the sensors is monitored. Breaks are eliminated, or sensors are changed.

    

    sunbathing Sensor Check engine says sensor malfunctions

conclusions

Maintenance (TO), which should be carried out according to the manufacturer's recommendations, will avoid many problems. The only question is where to pass, at the “Kulibins”, or at specialized service stations equipped with necessary equipment and hardware. The choice is up to the owner vehicle. The sooner the prerequisites for the failure of a particular part are revealed, the less financial losses in the future. It should be remembered that timely maintenance increases the safe operation of the car.

For the engine to develop full power, the following conditions must be met:

1 - good engine compression;

2 - stable and plentiful supply of fuel;

3 - a large number of air.

If one of the above conditions is not met, then Engine efficiency will be low.

When traction is lost under load, this means that the engine control unit has switched to emergency mode. The emergency mode of operation of the engine is provided on all modern machines. This mode is necessary so that the car does not quickly, but safely reach its destination.

To find the right reason I need to do computer diagnostics of the engine.

According to the results computer diagnostics we will understand in which direction to move and where to dig in order to find out the true cause of the malfunction.

If diesel the engine does not have enough fuel then check fuel equipment: .

If the diagnosis shows that diesel fuel enough, but the turbine is under-blowing and there are no errors in other systems, then it is advisable to measure the engine compression.

Lack of proper engine compression will result in the engine will not pull and develop full power. If there is no piston compression, but there is enough air and fuel, then a strong explosion will not happen anyway, thus there will be no good exhaust, and as we know, the exhaust spins the turbine, so the turbine will not inflate the required amount of air. Lack of air boost will cause the car to not pull.

The most common reason for lack of airflow- problems in the operation of the turbine and shutdown of the turbine itself.

Consider an engine with variable geometry turbines (the most common).

Turbine shutdown is usually due to one of two problems: one is related to air, the other is related to mechanical failure the turbine itself (impeller wear, axle play).

There are variable geometry turbines that are controlled by vacuum, and there are those that are controlled by an electronic actuator.

The machine has four sensors that fully affect the operation of the turbine.

1 - Boost pressure sensor. It will measure the air pressure in the intake manifold.

2 - Boost pressure regulator. This is a valve that controls the geometry, i.e. turns the turbine on and off.

3 - Intake air temperature sensor. Shows the temperature of the air entering the motor.

4 - Atmospheric pressure sensor. Measures the atmospheric pressure where the vehicle is moving (normal atmospheric pressure relative to sea level).

Most often it happens that the tightness of the air intake system is broken in the car. Thus, the turbine drives all the air out (the pipe is torn, the connection is poor at the joints, the intercooler (air cooling radiator) is cracked).

To identify such a problem, it is necessary to check the entire air intake system for leaks.

Next most common problem: Faulty geometry in the turbine.

To check the geometry on the car, you need to remove the vacuum hose from the actuator on the turbine itself. Put another hose on it and try with your mouth or special device draw in air. After this procedure, the stem that controls the geometry must change its position. If it does not change its position, then there may be 2 reasons, either the membrane in the actuator is torn, or the geometry itself is jammed.

Failure of the boost pressure regulator and boost pressure sensordetected by the presence of errors in them in the results of computer diagnostics.

The boost pressure regulator can also be checked with a vacuum gauge.

Don't forget to check Vacuum pump And vacuum tubes throughout the machine for tightness. This is done as follows, disconnect the pipe in some place, put your hand on it, you should feel air being drawn in.

A turbine with an electronic actuator is checked only with the help of computer diagnostics!

Please note that "swirl" flaps (not available in all vehicles) can also affect the loss of traction.

We hope that this information will help you identify the reason why your car is not pulling or gaining full power, as well as gaining enough knowledge to communicate with car service specialists.

• 1 The motor does not pull: the main reasons for reducing engine power
• 2 Malfunctions of the power supply system, ignition and disturbed mixture formation
• 3 Other causes of reduced engine output

Usually in the process long-term operation vehicle, almost every driver sooner or later notices that the engine pulls poorly. In other words, power unit can hardly cope with loads, there is a loss of power, the unit needs to be untwisted up to high speed to maintain the usual pace, the car accelerates worse from a standstill, slowly picks up speed, etc.

At the same time, the motor in many cases runs smoothly, does not troit, there are no increased vibrations, extraneous sounds, knocking or noise during ICE operation. We note right away that there is a fairly wide list of possible reasons why a warm engine does not pull, there is a loss of engine power to cold and / or hot.

In this article, we will talk about why the engine does not pull, and also consider the most common malfunctions that manifest themselves in the form of a loss of traction in the power unit.

The motor does not pull: the main reasons for reducing engine power

So, if no other symptoms, except for loss of traction, are found, then it is immediately necessary to pay attention to the quality of the fuel, the correct operation of the ignition and power systems.

• As practice shows, more than half of the cases of reducing the efficiency of internal combustion engines are associated with fuel. The engine does not pull due to the fact that poor quality or unsuitable for of this type engine fuel (for example, 92nd gasoline instead of 95th).

In some cases, after refueling, there may also be problems with starting the engine, engine detonation appears. To solve this problem, it is enough to dilute the available fuel with better quality. Less often, it becomes necessary to completely drain the fuel from the tank, after which an additional flushing of the power system is performed.

Usually, such manipulations are necessary when, in parallel with the loss of traction, an unstable operation of the internal combustion engine is noted, the revolutions jump or float at idle and under load, the engine does not start well, the “check” is lit on the panel, etc.

Also owners gasoline engines can independently determine the quality of gasoline by spark plugs and their appearance. To check the candles need to be unscrewed from the engine. Violation of the process of combustion of the fuel-air mixture in the cylinders, as well as the presence of impurities in the fuel, can be detected by soot on spark plugs and its color.

For example, if there are many third-party metal-containing additives and additives in the fuel, then the skirt and electrodes can be coated reddish soot(brick color). Black soot will indicate that the fuel is not burning properly, etc. In any case, failures in the combustion process working mixture cause the engine to stall.

• The next step in the diagnosis is to check the spark plugs. The decrease in the efficiency of these elements is also accompanied by a drop in the power of the power unit.

This is especially noticeable when sharp accelerations, and when the car is already moving on high speed. In other words, the motor does not have "reserve" for further acceleration.

Candles may turn out to be dirty, and it should not be ruled out that their resource has come to an end. To eliminate this problem, you can clean the candles or immediately replace the entire set with a new one.

At the same time, it is important to take into account that if new candles are correctly selected for a particular engine in terms of glow number and other parameters, but still quickly become dirty, then the cause of the loss of traction is not in them. The formation of soot in this case indicates problems with mixture formation or combustion of the fuel charge in the cylinders.

• If everything is in order with the candles, then it is necessary to check the condition of the fuel and air filters. In the first case, insufficient throughput can lead to the fact that the required amount of fuel is not supplied to the cylinders for the preparation of the so-called "power" mixture.

As a result, the engine loses power, that is, it does not pull under loads. IN similar situation it is enough to replace the indicated filter element. As for the air filter, the problem is similar to the fuel filter, however, in this case, there is a lack of air in the air-fuel mixture.

This leads to the fact that the fuel without a sufficient amount of oxygen burns incompletely. Motor power in similar conditions naturally falls, carbon deposits form in the combustion chamber, candles become heavily contaminated, etc. To solve the problem, the engine air filter also needs to be replaced.

Malfunctions of the power supply system, ignition and disturbed mixture formation

If problems with spark plugs and filters can be identified right on the road, then more serious problems related to the power and ignition system, it is much more difficult to diagnose and eliminate on the spot. In cases where the engine does not pick up speed, and jerks and dips are noted when pressing the gas pedal, it is necessary to check and adjust the carburetor or injector.

Let's focus on the more common electronic injection. In the list of the main faults of modern injection internal combustion engines allocate:

• malfunctions, reduced performance or contamination of the fuel pump mesh filter;
• malfunctions injector nozzles;
• problems with ECM or ECU sensors;
• malfunctions of the ignition system;
• air leaks and leaks fuel lines;

If we talk about the ignition system, in addition to candles, you should also check the UOZ, high voltage wires, ignition coils, etc. As for the fuel supply, at the initial stage, the pressure in fuel rail(rail). In parallel, the pressure regulator in the fuel rail is also checked.

Often, on many cars, problems are associated with the fuel pump, which is located in the gas tank, as well as with the specified regulator. To measure the fuel pressure, a pressure gauge is connected to the rail, the values ​​obtained are compared with those recommended for a particular engine. If the pressure is below normal, then both the fuel pump and the pressure regulator may be the culprit.

The task of the regulator is to dump excess fuel into the return line at a time when the pressure is above normal. If the settings are wrong or the regulator itself is leaking or faulty, then the fuel will be dumped into the return line ahead of time. To check this, air is pumped with a compressor or pump, the pressure in the rail increases. If the regulator has worked before the recommended pressure indicator, the element must be adjusted or replaced.

We also recommend reading the article on why the engine twitches during acceleration. In this article, you will learn about the main causes of engine jerks when you press the gas hard, as well as how to identify this problem and repair it.

In the event that the fuel pump does not pump gasoline or the right pressure is not created, it is necessary to remove the device from the tank, clean or replace the mesh on the pump. If the situation does not change, then the pump is faulty and needs to be repaired/replaced.

As for the injection nozzles, these elements must not only open and close in a timely manner, but also supply fuel to the cylinders in full. The shape of the spray pattern is also important. For this reason, the injectors must be checked and regularly cleaned of contaminants so that the fuel is sprayed evenly.

• ECM sensors (MAP, air pressure sensor, etc.) send a signal to the ECU, so the controller takes into account how much air the engine is using. Based on these data, the unit determines how much fuel must be supplied through the injectors to form the desired fuel-air mixture, taking into account one or another mode of operation of the internal combustion engine.

In the event that the sensors do not work correctly, the ECU may supply the wrong amount of fuel. As a result, the engine does not pull and the car does not drive as it should. You can use a multimeter to check the sensors, but optimal way is to carry out computer diagnostics of the engine.

Other causes of reduced engine performance

Also for motor power big influence renders a state exhaust system. The point is that in order to protect environment from harmful emissions during the operation of the internal combustion engine, catalytic converters are installed in the outlet.

During operation, the filter catalyst may be destroyed, the throughput of the exhaust system is reduced. As a result, the engine is "strangled". The check is made by measuring the pressure before and after the catalyst. You can also remove the element and inspect its condition visually.

As a rule, official services offer to replace a worn element, but the price of the spare part is very high. For this reason, on many cars in the CIS, the catalyst is simply knocked out, and the control unit is “deceived” by software or other accessible ways.

Also, when the engine power is reduced, it is necessary to separately check the installation of the timing belt or timing chain according to the marks in order to exclude the possibility of a valve timing failure. Sometimes there are situations when the belt can jump one tooth, the chain stretches, etc.

In this case synchronous operation valve mechanism in relation to the cycles of the internal combustion engine may be broken. This leads to various failures, precarious work unit and power reduction.

We also add that engine wear and certain malfunctions also affect engine power. As a general rule, worn-out used ICEs typically lose about 10% of their advertised power.

If the driver feels that there are more losses, then the compression in the engine needs to be measured. low compression on cylinders can occur as a result of wear of the cylinder walls, piston rings, valve burnout or incomplete closing, etc.

One way or another, any leaks in the combustion chamber will cause the expanding gases during the combustion of the fuel to break out of the cylinder. This means that the pressure of these gases on the piston will decrease, and the internal combustion engine itself will pull poorly and work unstably.

Finally, we note that also the reason that the car lost in dynamics may not be the engine, but the transmission. In other words, the power unit develops enough power, but it is not fully transmitted to the wheels.

This usually manifests itself in such a way that the engine roars, the speed is high, but the car does not move or acceleration is very slow for low gears. Often such problems are associated with clutch or automatic transmission slippage, as well as wedging brake system. To check the brakes, it is enough to disperse the car for flat road, then enable neutral gear.

If, when coasting, it is noticeable that the car immediately began to slow down, then the problem is obvious, the wheels are slightly blocked. If there are no problems with the brakes, then automatic transmission diagnostics are necessary. It is better to entrust the specified procedure to experienced specialists by delivering the car to the service.