What s wrong with the car s inability to accelerate? What s wrong with a car s lack of acceleration?

I believe that many car owners have encountered the experience of not being able to go up at the speed of the car accelerator, and that feeling seems to be unable to make it, but what is going on? Next, let's analyze the reasons why the car is unable to refuel and slow to speed up.

First, if the speed of the car does not go up at the gas pedal, there is a high probability that the clutch has slipped. Clutch slip is mainly manifested in the acceleration of the car driving, the speed can not increase with the increase of engine speed, and the power of the engine can not be completely transmitted to the driving wheel, resulting in driving weakness, especially when going uphill.

The main reason for clutch slippage is the lack of friction of the clutch friction plates; If the clutch is not in place, grab the gear or take it out of gear; long-term semi-clutch state sports car, stepping on the clutch and sliding; When the gear or disgear is not in place, the car will slam the throttle when the gear or disgear is not fully in place, resulting in abnormal loss of the clutch.

Of course, the speed of the car fuel pedal can not go up, we also have to focus on the engine, the power is the combustion of fuel, and the engine is responsible for providing fuel, and converting chemical energy into mechanical energy, so when the car is unable to refuel and speed up slowly, the engine system should also be checked as a focus.

First of all, we can do some simple checks on our own, such as whether the wrong oil is added, which is also possible, because adding low-grade gasoline may cause weak acceleration, resulting in a decrease in engine power and an increase in fuel consumption.

Then there is the engine oil system, which is not only important because it can be fully lubricated, but also reduce resonance and improve the smooth operation of the engine. If the engine oil is insufficient for a long time, the light one will have insufficient power and the fuel consumption will increase; In the heavier case, the piston strikes the door, causing mechanical damage to the associated connectors. In addition, a faulty gasoline pump and a clogged fuel filter can also cause a drop in engine power.

Then there is the intake system of the engine, the engine needs air in addition to oil, if the air filter, throttle and other components are blocked or there are problems, resulting in insufficient air intake, it will also cause the car to accelerate weakly and slowly, and there is a sense of frustration.

The ignition system is also not negligible, and if the spark plug ignition, leakage or atomization is poor, it will also affect the engine acceleration.

In addition, we can judge that there is a problem according to the symptoms that the car is also accompanied by, such as smoke from the exhaust pipe, if there is black smoke, then there is a problem with the combustion chamber, ignition system, and valve; If there is blue smoke coming out of the exhaust pipe, then it is possible that the engine oil has run to the combustion chamber, which is what we call burning the engine oil.

Many people don't think so, thinking that the car refueling is not able to speed up and slow down the small things, but if you don't pay attention to the small things, it will cause big things, so the owner must go to the professional repair shop or 4S shop for maintenance in time after the symptoms appear.

If we have a fault meter, we can read the fault code of the car, and then know which module of the car reports the fault code, and then we can deal with the fault module. However, the vast majority of car owners do not have this instrument, so we should go step by step, according to the actual situation of the car to determine what is going on with the accelerator pedal or not.

First of all, we try to judge that there is a problem with the accelerator pedal of the car, because when stepping on the accelerator, the cable will drive the throttle, that is, the throttle, there is a position sensor on the throttle, and the control unit knows the opening of the throttle according to the throttle position sensor signal, and then calculates the corresponding signal voltage, and finally calculates the fuel injection amount of the vehicle according to the single pressure of this signal.

Therefore, if the throttle position sensor is too dirty or the voltage is out of balance, it will lead to the failure of the electronic throttle, and the throttle will not be able to go up at the end speed.

If the fault of the electronic throttle is ruled out, then we should shift our attention to the three systems of the engine's air intake, oil circuit and ignition, any part of one of the systems is faulty or abnormal, which may lead to the car throttle pressing the speed can not go up.

Just mentioned the throttle position sensor signal, in fact, it is a member of the air intake system, the engine needs sufficient air to work normally, if the air intake system is leaking or blocked, then when the car refuels the throttle, there will be a drop in power, the speed can not go up, and the body shakes.

The oil circuit system of the engine is also very important, if poor quality gasoline is added, it is likely to lead to gasoline pump burnout, three-way catalytic failure, piston failure, etc., which directly affects the engine power, and is easy to cause the engine to stall and accelerate the vehicle speed.

There is also an ignition system, ignition high-voltage line generally rarely has problems, then the main problems are in the ignition coil and spark plug, because they are all wearing parts, when the performance of the spark plug is reduced or the use of inferior spark plug will lead to the car acceleration weakness, acceleration jitter and other situations.

Finally, if the probability of a failure of the ECU control element is very low, the ECU will activate the backup ECU and enter limp mode. Of course, some models will directly enter limp mode if they have the above situation. The limp mode is designed to allow the vehicle to move to a safe place or workshop as quickly as possible, and can only drive at a lower speed even if the accelerator is pressed all the way.

It may be caused by three-way catalytic blockage.

The high-pressure oil pump does not work, the car accelerates weakly, and the power is insufficient.

When the acceleration of the car is weak, it should be accompanied by the occurrence of trembling when the engine accelerates, and there may also be guns, black smoke, etc. The reasons for it are manifold. It is mainly reflected in the three major aspects of oil, electricity and machinery.

First, the oil circuit failure.

Many people think that throttle carbon deposits will affect the acceleration performance of the engine. However, I think that throttle carbon deposition only affects idle instability, and has little impact on engine acceleration performance.

The air filter element is blocked or water ingress will make the air volume small, resulting in too thick the mixture, incomplete combustion of the engine, and poor acceleration, at this time, the exhaust pipe will be seriously smoky.

Cracks in the oil pipe or loose air leakage in the joint, and insufficient pressure of the oil pump, resulting in poor oil supply and weak acceleration. The injector is poorly atomized or clogged, resulting in the cylinder not working well or not working. Affects acceleration performance. Black smoke may come out of the exhaust pipe.

The issue of oil products is also an aspect. If the water content of the oil is too large, the exhaust pipe will emit white smoke.

Second, circuit failure.

There is a problem with the air flow meter, which causes a decrease in the air intake, resulting in an over-concentrated or over-thin mixture, which affects the acceleration performance.

The spark plugs of individual cylinders are damaged, that is, the cylinders are missing, which affects the acceleration performance. Also, leakage of cylinder line, etc.

High water temperatures or bad temperature sensors can also affect acceleration. A clogged three-way catalytic converter or a faulty oxygen sensor can also cause poor engine acceleration (many people think that the oxygen sensor does not affect the engine, only the emissions).

Third, mechanical failure.

Engine valves, cylinder liners, pistons, and rings are worn out, resulting in cylinder pressure not meeting the requirements.

The intake valve clearance is too large, and the exhaust valve clearance is too small. Or the intake and exhaust valves are out. This will lead to a lack of cylinders. Affects acceleration performance.

The timing belt (chain) wears out, resulting in a sooner or later ignition time pattern that also affects the acceleration performance.

A collapsed engine gasket can also cause this problem.

Excessive carbon build-up in the cylinder. It's also a reason.

In fact, there are many reasons why the engine has poor acceleration. It should be judged according to the various conditions of the vehicle. For example, the number of kilometers driven, the age of the vehicle, the fault point and so on. This requires some maintenance experience.

Many people say that it can be plugged into a computer for testing. But beware, like many mechanical failures, computers can't detect them. For example, the size of the valve clearance cannot be detected by the computer. Of course, the fault of the circuit is very easy for the computer to detect.

The acceleration weakness of the car may be due to serious carbon deposits or congestion on the road, and the high start-stop frequency of the car, resulting in a sense of acceleration weakness when accelerating, and it may also be that the oil quality is relatively poor.

What is the reason for the sudden acceleration of the car.

1. The engine oil circuit system is the place where the car often has problems, the fuel injector is blocked, the oil pipe is leaking, the power of the gasoline pump is reduced, and the gasoline filter is blocked. The main reason why the car has a sense of powerlessness is that the engine does not have enough oil when going uphill, the combustion efficiency decreases, and the horsepower does not meet our requirements.

2. In addition, the same is true for the air intake system, in addition to the engine needs oil, it also needs air, if the air filter, throttle and other components are blocked or there are problems, resulting in insufficient air intake, it will also cause the car to accelerate weakly and slowly.

3. The spark plug is also the source of common faults, if the spark plug ignition is poor, it may lead to the problem of weak acceleration.

4. If the car is sluggish, and the car will feel the steering wheel or body shake significantly when it stops, then it means that at least one cylinder of the car's engine is running abnormally or stalling. In general, a four-cylinder engine can still run if one of the cylinders does not start, and as the number of cylinders increases, this symptom becomes more difficult to detect.

5. Exhaust system failure, exhaust system failure mainly refers to poor exhaust, which is generally caused by three-way catalytic crushing, of course, if someone is naughty and stuffs potatoes, steel wool balls, etc. into your exhaust pipe, it is another matter. If the exhaust pipe is blocked, the engine power will be reduced.

The first is the failure of the engine's oil circuit system, specifically the blockage of the fuel injector, the leakage of the oil pipe, and the decrease in the power of the gasoline pump, which will cause the car to accelerate slowly and accelerate weakly; It is recommended that the owner clean the fuel injector and engine oil system.

The second is the failure of the engine's air intake system, in addition to the engine needs oil, it also needs air, and the gasoline filter, throttle and other parts are blocked or have too much carbon, which will lead to insufficient air intake, and will also cause the car to speed up slowly and accelerate weakly.

The third is the spark plug, the spark plug is the source of many car failures, and the ignition performance of the spark plug will also lead to slow acceleration and weak acceleration of the car; It is recommended that the owner replace the spark plug.

The fourth is the problem of engine cylinders, if the engine has a cylinder that does not work, although the engine can run, but the power is far from enough.

The fifth is to turn on the air conditioner in the summer, and the small displacement car will feel that the acceleration is very difficult, and the fuel consumption increases very quickly; This is because when the air conditioner is working, it needs to drive the compressor to do the work, and the power of the compressor is very large, so the engine can be said to be too busy, and the speed will naturally be very slow.

The sixth is the insufficient tire pressure of the tire, which will flatten the tire of the car, and at this time it will also lead to the weakness of the car's speed. In addition, it is necessary to learn to judge the problem according to the symptoms, for example, black smoke from the exhaust pipe, then there is a problem with the ignition system and throttle during combustion; If there is blue smoke, then it is possible that the engine oil has run into the combustion chamber, which is what we often call burning engine oil.

What are the reasons for the car's inability to accelerate?

In long-term use, automobiles are prone to various failures, such as abnormal braking performance, increased fuel consumption, insufficient acceleration, etc. Among them, insufficient acceleration is undoubtedly one of the most common and troublesome failures. So, why does the car have a failure with insufficient acceleration?

What parts tend to affect the acceleration performance of the car?

The acceleration performance of a car is closely related to the operation of the engine. We usually increase the opening of the throttle after pressing the accelerator pedal. At this point, the fuel** system will input more fuel to provide more power.

Therefore, the failure phenomenon of the car not being able to accelerate may involve many car parts.

First of all, most of the reason why a car feels powerless to accelerate is because the engine doesn't have enough fuel or empty gasoline while driving. Therefore, if the pipes, parts of the fuel system, and many parts of the air intake system are clogged, such as the oil pipe is clogged, or the air air filter, throttle valve and other parts are clogged, it will lead to an abnormal situation where the car cannot accelerate.

Secondly, if the amount of fuel and air gas is appropriate, if the car still appears to be underpowered, or even has obvious idle shaking, it is likely that the engine cylinder is not working properly, or even causing the cylinder to stall. At this time, the elimination method should be used in time to find out the faulty cylinder and repair it to prevent greater damage to the vehicle.

In addition, sometimes the air intake system and fuel system are normal, but the mixture concentration can also be abnormal, which is most likely caused by a problem with the exhaust system. Generally, the exhaust system here is not smooth, and in most cases it is due to a damage to the three-way catalytic converter system or a blockage of the exhaust pipe, which leads to a decrease in engine power.

Finally, when a car's powertrain fails, there is a noticeable anomaly. For example, when the engine burns oil, the exhaust pipe will emit a lot of blue smoke, and when the car has a lot of carbon deposits, it will make it difficult for the car to start cold, etc. Once you understand how these failures work, it becomes very easy to solve.

There are many reasons for the lack of acceleration of the car, and the specific problems of the specific model are not the same, you can go to the relevant car forum, and you should be able to find what problems are caused by the relevant forum.