When the car is unable to accelerate, it should be accompanied by shaking when the engine accelerates, shooting, black smoke, etc. There are many reasons for it. It is mainly reflected in oil, electricity and machinery.

一，油路故障。

1、 Oil circuit failure.

很多人认为节气门积碳会影响发动机加速性能。但我认节气门积碳只是影响怠速不稳，对发动机加速性能影响不大。

Many people believe that carbon deposition on the throttle will affect the acceleration performance of the engine. But I think throttle carbon deposition only affects the unstable idle speed and has little impact on the acceleration performance of the engine.

空滤芯堵塞或进水会使空气量小，导致混合气过浓，发动机燃烧不完全，加速会不畅，此时，排气管黑烟严重。

Clogged air filter element or water inflow will reduce the amount of air, resulting in excessive mixture, incomplete engine combustion and poor acceleration. At this time, the black smoke of exhaust pipe is serious.

油管裂纹或接头松旷漏气，油泵压力不够，导致供油不畅，影响加速无力。

The oil pipe is cracked or the joint is loose and leaking, and the oil pump pressure is not enough, resulting in poor oil supply and weak acceleration.

喷油器雾化不良或堵塞，导致缸工作不好或不工作。影响加速性能。排气管可能冒黑烟。

Poor atomization or blockage of fuel injector, resulting in poor or inoperative cylinder operation. Affect acceleration performance. The exhaust pipe may emit black smoke.

油品问题也是一个方面。油如含水量过大，排气管会排白色烟的。

The oil problem is also one aspect. If the oil contains too much water, the exhaust pipe will emit white smoke.

二，电路故障。

2、 The circuit is faulty.

空气流量计有问题，引起的进气量减少，导致混合气过浓或过稀，影响加速性能。

There is a problem with the air flow meter, resulting in the reduction of air intake, resulting in too rich or too lean mixture, affecting the acceleration performance.

个别缸火花塞损坏，也就是说缺缸，影响加速性能。还有，缸线漏电等。

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

水温过高或温度传感器坏同样影响加速性能。

High water temperature or bad temperature sensor also affect the acceleration performance.

三元催化装置堵塞或氧传感器有问题也会导致发动机加速不畅（很多人认为氧传感器不影响发动机，只影响排放）。

Blockage of the three-way catalytic device or problems with the oxygen sensor will also lead to poor engine acceleration (many people think that the oxygen sensor does not affect the engine, but only the emission).

三，机械故障。

3、 Mechanical failure.

发动机气门，缸套，活塞，环磨损后导致缸压达不到要求。

The engine valve, cylinder liner, piston and ring are worn, resulting in the cylinder pressure not meeting the requirements.

进气门间隙过大，排气门间隙过小。或进排气门呲了。会导致缺缸。影响加速性能。

The inlet valve clearance is too large and the exhaust valve clearance is too small. Or the intake and exhaust valves are exposed. It will cause cylinder shortage. Affect acceleration performance.

正时皮带（链条）磨损，导致点火时间式迟或早同样影响加速性能。

The timing belt (chain) is worn, resulting in late or early ignition time, which also affects the acceleration performance.

发动机缸垫呲了，也会导致此问题的发生。

The engine cylinder gasket is exposed, which will also lead to this problem.

缸内积碳过多。也是一种原因。

Excessive carbon deposit in cylinder. It's also a reason.

实际上，发动机加速不畅的原因很多。要根据车辆的各种情况来判断。比如行驶，车辆年限，故障点等等原因来进行判断。这是要有一定维修经验的。

In fact, there are many reasons for poor engine acceleration. Judge according to various conditions of the vehicle. Such as driving kilometers, vehicle years, fault points and other reasons. This requires some maintenance experience.

很多人说可以插电脑检测。但要注意，象很多机械故障电脑是检测不出来的。比如说气门间隙大小，电脑是检测不到的。当然，电路故障，电脑是很容易检测的。

Many people say you can plug in a computer for testing. But it should be noted that computers can't detect many mechanical faults. For example, the size of valve clearance can not be detected by computer. Of course, the computer can easily detect circuit faults.

通过以上分析，可以看出，发动机加速不畅是有很多原因的。判断这方面还是要有一定的经验。否则，会象咬刺猬无处下手的。

Through the above analysis, it can be seen that there are many reasons for poor engine acceleration. We should have some experience in this aspect. Otherwise, it will be like a dog biting a hedgehog.