If the engine of your car does not gain momentum, or does not cope well with it, stops pulling, sneezes, hiccups, you must admit that this is very unpleasant. Let's try to figure out here what are the reasons for such unhealthy behavior of the motor, which we assure you, there are a great many, ranging from some kind of wiring or pipe, to very troublesome hardware or electronics.
The most common causes of poor engine traction and revs
1) Malfunction either in the fuel supply system itself, or its deterioration. For both gasoline and diesel engines, this item is always the first to be checked if the engine stops pulling and / or starts to pick up speed poorly.
In gasoline engines, the fuel pump most often fails, so the first thing they check is it, and it doesn’t matter what type it is, mechanical or electric, there are enough examples from life. Here, for example, one: a driver on a trade wind, equipped with a single injection, came to the service, complaining that the thrust of the motor had disappeared. What do you think could be the reason? It is true that the fuel pump slowly began to fail, as a result of which, the “malnutrition” of fuel began, and the engine, when it is starving, is no longer so peppy. What needs to be done? Check the fuel pump itself, and if everything is in order there, then also look at the fuel distribution and supply body, that is, injection, carburetor, mono injection or injector.
As for diesels, in most cases, when the equipment with injectors fails, the problems that are described in the title begin. The end of the injector nozzles and the failure of the injection pump plunger pairs can lead to a significant loss of engine power, and, moreover, to the point that the latter will stop starting at all. And if the check showed that the equipment with the injectors is alive and you are sure of it, and the engine stubbornly, as before, does not want to gain momentum as it should, then most likely you have a late ignition, which means you need to delve into the settings with ignition timing, or rather make it earlier. In the fuel system of a diesel engine, air leakage is a real evil. It starts to suck both through dead sealing washers, which are copper or aluminum, and through a small hole that appeared in one of the hoses of the auto fuel supply unit. In general, it is necessary to find and neutralize the suction. Fuel filters, which equally applies to diesel engines and gasoline engines, if they have not been changed for a long time and they are clogged, then thrust from the engine in this case can not be expected. You need to clean, or change the filters, "clearing" the blockage in the nose of your car.
2) Let's move on to the next reason - a malfunction of the ignition system. It is necessary here to find out if your motor is troiting, if it is troiting, you can find the corresponding article on our website and read it. So, if it doesn’t troit, then you should start with a simple one, with a distributor. Firstly, with the engine running, you should spin it and try to catch the moment - if there is one, of course, when the engine starts to work more quickly. If not, then carefully inspect the candles and wires, and other electrical components. If you have an injection type motor, then you should start with the timing marks, because the moment of supply of both sparks and fuel injection depends on the correct installation of injection engines. Further, if everything is OK with the labels, then some sensor is probably out of order. If you are not in the know, then in the injection motor, the number of all sorts of sensors and sensors there is darkness! The list includes both a mass air flow sensor and a position sensor. crankshaft, and camshaft sensor, and lambda probes, and sensor idle move Yes, it's impossible to list them all. That's all this "extras", and you have to check for performance either by yourself or by an auto electrician, if you contact him. Another topic: if your engine started to gain momentum badly after updating the timing belt or chain, then they probably made a mistake during installation, since here the tooth to the left or right plays a huge, decisive role, as a result, a mistake of just one tooth can deprive you of pleasure when pressing the gas into the floor, and instead of "jumping" from a place with a slip, you will get only an uncertain, miserable displacement from a place with such a "bonus" as increased consumption fuel.
3) The next reason is a problem with the air supply. It is also fraught with a loss of power of air leakage on the way to the cylinders, which comes after the mass air flow sensor, because the computer constantly calculates the composition fuel-air mixture on the basis of those indications that are based on information on the amount of air supplied. So, this data is transmitted to him by the DMRV, and if there is more air than expected, then, as a result, we are guaranteed a lean mixture with a weak engine thrust. The air filter, which is desirable to be replaced every six months, but there are clever people who do not change it for years. As a result of this, we get a difficult air flow, an engine that is gaining momentum poorly and does not produce the required power, and black smoke. So, simple replacement filters will solve this problem.
4) And finally, we will complete our review with the last common problem that happens due to the fault of the exhaust. So, before getting into the ocean of prose on this topic, we would advise you to check the condition of the catalyst, if, of course, it is still standing. Consider another example from Audi, from which it follows that if it is clogged, then this is sad. So, on the Audi 100 C4, with a 2.3-liter five-cylinder engine, there was a case when it did not gain momentum, 4 thousand on the tachometer was the limit! The masters racked their brains for a long time, as a result, just in case, they checked the catalyst and threw it away, and the engine became like a beast. It seems that for many it is not a secret that engines with no exhaust system give out 10-17% more power - depending on the model, and in this regard, such a device as "forward flow" is known in the world of car tuning. This is a slang abbreviation for the concept of straight-through exhaust, that is exhaust pipes with an increased diameter, and a catalyst forgotten by garbage and slag, this, on the contrary, is for the “anti-tuning” motor, well, it is, for general erudition. And now let's move on to prose, also a real case. They brought the KamAZ engine for overhaul, the reason: the power disappears, and the momentum is not gaining. Opening the head showed that there was a “cover” for the motor, apparently it ate oil well, and this oil, in addition to this, also burned out just inside the exhaust manifold! As a result, there was an unmeasured amount of soot on the walls of the exhaust manifold, only a hole with a diameter of almost four cm remained, and this is tantamount to the fact that a person has constipation, and he is not treated without outside intervention!
One of the signs of an engine problem is usually that the engine does not pick up speed ("does not spin up", as many motorists say). There can be a lot of reasons that the engine is not gaining momentum, an accurate diagnosis can only be made by an experienced diagnostician, but an initial check can be carried out on your own. So, what are the reasons for the engine not picking up speed?
The engine does not pick up speed. What to check first?
Fuel supply system. Usually checking the reasons why gasoline or diesel engine is not gaining momentum, they start with it. If it's about gasoline engine, then first of all you should check the serviceability of the fuel pump - it does not matter if it is mechanical or electric.
For diesel engines, the test begins with equipment with injectors, because it is this that most often causes engine power loss. In addition, the possibility of air leakage in the fuel system should be excluded.
Like the gasoline and diesel engines, it stands because it could clog and affect engine traction.
Ignition system. First, check if the engine is troit. Then remember if the timing belt or chain has been changed recently. Very often, the timing belt or chain is installed incorrectly, which is why the engine does not pick up speed and “dulls”.
In addition, you should carefully inspect the wires and candles to make sure they are intact and in good condition. Engine thrust can also be affected by a failed sensor (DMRV, DHX, crankshaft sensor, camshaft sensor, position sensor throttle valve etc.).
Air supply. Another common reason why the engine does not pick up speed is air leaks on the way of the fuel-air mixture into the cylinders. Also, it should.
Exhaust system. Many cars have a noticeable effect on traction, so check exhaust system it is worth starting with the catalyst (if any).
Another very common reason for an engine not revving is bad fuel. If you refueled at an unknown gas station, the problem may be the quality of the fuel.
If all of the above is normal, then for a more detailed study it is better to contact specialists who can accurately determine the cause of the malfunction.
During operation of diesel or petrol power unit a motorist may encounter a situation where, when you press the gas, the engine does not gain momentum. It is worth noting that after installing HBO on a car, such a problem often appears when the engine does not gain momentum on gas, although it drives normally on gasoline. Malfunctions of various kinds may lie in simple things, but may indicate the need for serious engine repairs. More on this later in the article.
If the internal combustion engine has stopped gaining momentum, first of all, you need to analyze how and when it manifested itself. That is, the engine refused to spin up unexpectedly, or the problem with the development of revolutions progressed gradually. It is also necessary to pay attention to the absence or presence of other symptoms.
The bottom line is that if a previously good engine refuses to pick up speed after performing any repairs or other operations, this may be the result of errors during assembly, a sensor not connected, and so on. In such cases, the breakdown can be more accurately and quickly determined using an independent inspection or the immediate return of the car to the service where the vehicle was repaired before.
If the engine does not gain momentum for no apparent reason, troit, the car systematically stalls, and so on, then the motor requires in-depth diagnostics. The causes of such a malfunction can be conditionally divided into complex and simple, appearing immediately or having received preconditions.
Why does the engine rev slowly?
The set of revolutions while driving is strongly affected by the composition, efficiency of supply, completeness of combustion and the timeliness of ignition of the air-fuel mixture. A common reason that the internal combustion engine does not gain momentum (diesel, carburetor, injector, gas car) are malfunctions in the fuel and air supply systems, as well as in the ignition system.
Why does the engine rev and stall?
It often happens that the internal combustion engine is gaining momentum and stalls as a result of a clogged fuel pump filter mesh. The fact is that deposits from the gas tank accumulate on this filter over time. Due to the pressure in the system, there is not enough fuel, the pump performance decreases, and the engine itself cannot function normally in various modes. To fix the problem, you need to clean or replace the mesh. However, this is only one possible reason of many others, which we will consider next.
Simple reasons due to which the engine is not gaining momentum, how to eliminate them
Experts highlight the following:
Most of the above reasons, the car owner can determine and eliminate on their own. It is necessary to check the wires of the ignition system and spark plugs, measure the pressure in the fuel rail (on injection engines), inspect the air filter for contamination, replace fuel filter etc.
Complex, sudden reasons why the engine does not gain momentum, how to eliminate them
Now let's look at problems that may require some skills, knowledge, diagnostic equipment, or be a reason for a trip to a car service. In this list of malfunctions, as a rule, there are those when the engine does not gain momentum due to the failure of one of the ECM elements, the power supply system, ignition, and so on. That is, here we are no longer talking about “consumables” (pipes, filters, wires, candles), but about details. At the same time, consider whether the malfunction progressed gradually or the breakdown occurred unexpectedly.
- One of the reasons is the downed timing phases. Violation of the synchronous operation of the gas distribution mechanism with respect to the exhaust and intake strokes entails the untimely opening of the intake and exhaust valves. The malfunction appears due to errors when replacing the timing belt, if the belt jumped one or more teeth. Another reason may be incorrectly adjusted valves (the problem does not manifest itself sharply), malfunctions of the timing chain drive, various breakdowns in the variable valve timing system, and so on.
- Unexpected breakdowns include the failure of the ignition module, as well as malfunctions of the ignition coils. In this situation, misfires begin, the engine troit and can no longer gain momentum normally.
- Also check nutrition injector nozzles. If there are problems with the wiring, the control signal to the nozzle comes intermittently or not at all. As a result, the nozzle does not open in a timely manner, misfires appear in one or more cylinders, the engine loses power and does not gain the required speed.
- The fuel pump or injection pump on a diesel engine may fail. As a rule, this malfunction does not appear immediately (with the exception of damage to the electrical wiring to the pump). More often, pump performance decreases gradually. But sooner or later, the fuel pump will begin to pump fuel very weakly, the pressure will only be enough to work on the twentieth. An increase in speed and load will lead to the fact that the motor does not spin up, stalls under load, and so on.
- Sometimes similar symptoms entail severe contamination of the injector. Driving on low-quality fuel, as well as ignoring the required injector cleaning procedure every 40 thousand km. mileage may indicate that the performance of one or more injectors has dropped significantly.
Ultrasonic nozzle cleaning - Engine speed can also be affected by the state of the EGR system, as well as throughput particulate filter or a catalyst. As a result of a clogged catalyst, exhaust gas removal deteriorates, the engine literally “suffocates” and does not gain normal speed.
- In parallel, you need to check different ECM sensors (DMRV, TPS and others). Their incorrect functioning can affect the composition of the mixture (the amount of air and fuel supplied to the engine).
Untimely maintenance of the engine, which leads to an irresponsible attitude towards the car
Finally, I would like to say that the timely replacement of wires and spark plugs, filter elements and fuel pump filters, cleaning of the injector, throttle valve, correct throttle adjustment and other service procedures will give you the opportunity to get the maximum power from your engine. Untimely maintenance of the internal combustion engine, on the contrary, can lead to destabilization of the engine and other more serious problems up to the overhaul.
As for cars with HBO, the correct setting and installation, timely replacement of filters, as well as maintenance of other HBO elements will depend on both the engine power and its speed, and the overall service life of the internal combustion engine.
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Why is the engine not picking up the speed that is necessary for 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.
The failure of a fully functional internal combustion engine to gain the required 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. The set of necessary indicators when driving is very dependent on the usefulness of combustion, the composition of the mixture, the efficiency of supplying it in the right volume and timely ignition.
One of the common reasons why the speed cannot be gained to the desired value is the disrupted operation of the ignition, fuel and air supply systems:
- Significantly clogged air filters reduce the ability for air to pass 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 air filter branches, dirt, packages, etc.;
- 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;
- The unit is not receiving enough fuel. Usually, the culprit is a filter, which can easily become clogged with foreign objects. Usually, there are no problems with starting the internal combustion engine, 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;
- 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;
- 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;
- Trouble of the engine during breaks high voltage wires, misfiring, worsened dynamics of the set of internal combustion engines revolutions.
Serious malfunctions that require a certain level of skill, knowledge and special equipment or a visit to a workshop. It will no longer be about consumables, but about 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;
- It is worth paying special attention to the power supply of the injectors on the injector. The control signal does not act on the nozzle, or it occurs intermittently due to incorrect wiring;
- Violations in the operation of the fuel pump, and if 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 extremely poor quality fuel. 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 engine washing and careless diagnostic maintenance of the firmware.
The result of such an intervention is an inadequate perception of the ECU speed: low are taken for high, and vice versa. The maximum power of the internal combustion engine can be obtained provided that all maintenance work provided by the manufacturer and other equally important service activities.