A netizen consulted me, the car bought for five years, driven 100,000 kilometers, for no reason there was a phenomenon of in situ idle speed shaking, it does not affect the normal driving of the vehicle, after running, it is no different from the new car, what is the reason for this? I believe that the owner of this situation is definitely not only himself, for the car, 100,000 kilometers is a hurdle, more than 100,000 kilometers of cars, more or less there will be some problems, which requires the owner to carry out detailed maintenance of it.
The car is idle in situ and there is a jitter phenomenon, let's split this fault, the source of the jitter - the engine, the jitter transmission mechanism - the foot, the frame. The cause of the jitter either comes from the engine itself or from a failure in the transmission path.
The source of jitter - the engine
Engine injection system failure
The engine wants to operate normally, the fuel supply system is the key, if the oil supply system fails, the filter element is blocked, the oil pressure pumped by the fuel pump is not sufficient, it will lead to the supply of gasoline is not smooth, the engine cylinder can not form a stable mixture, affecting the combustion in the engine cylinder, at this time, the engine will appear idle jitter phenomenon, but when the owner is driving normally, the engine injection amount is larger, the fuel injection pulse width is longer, and the failure of the fuel injection system is not enough to affect the normal driving of the vehicle. In this case, the owner needs to clean the gasoline filter and check the working status of the fuel pump at the same time.
The engine has too much carbon deposit
For the internal combustion engine, it is by burning gasoline or diesel to do external work, but gasoline or diesel can not be 100% burning in the cylinder of the internal combustion engine, insufficient combustion will produce paraffin-like substances, in the long run, it will form a thick layer of carbon deposits in the engine fuel injectors, throttles, intake pipes, etc. Too much carbon deposit will affect the intake and injection of the engine. If the engine intake is unstable, the intake of air is suddenly large and small, the engine speed will float up and down, if the amount of fuel injected by the engine is limited, the mixture is suddenly thick and thin, which will cause the engine to be idle and unstable.
The most effective way to remove carbon deposits is to disassemble the engine and carry out a thorough cleaning of each part, if you feel troublesome, then buy a fuel treasure, although the carbon deposition removal is not complete, but it always has an effect.
Engine ignition system failure
The engine ignition system is composed of batteries, distributors, ignition coils, spark plugs, etc., the most prone to failure is the ignition coil and spark plug, resulting in a fire phenomenon in a cylinder block of the engine, and the 4 cylinders become 3 cylinders. However, this failure is very obvious, and the owner can clearly feel the abnormal idle speed of the engine and the violent shaking.
Jitter propagation path - foot, frame
The engine is mainly connected to the frame through the foot, in order to slow down the jitter effect of the engine, the foot is generally made of rubber, after a long time of use, the rubber is easy to appear aging, cracking phenomenon, so that the buffer effect becomes very poor, the normal jitter phenomenon of the engine is transmitted to the frame, which will make the steering wheel and cab appear slight resonance phenomenon, so that the owner can obviously feel the idling jitter phenomenon.
For cars with a range of up to 100,000 kilometers, the frame will also be slightly cracked, and the natural frequency of the cracked parts will change, and the jitter of the engine will be transmitted to the position of the parts, and there may also be slight shaking or abnormal noise, which will be perceived by the owner.
If your car has driven more than 100,000 kilometers, and there is idle jitter, you can check from the above aspects one by one, the engine idle jitter problem will be solved, if you really can't solve it, you can send a private message or leave a comment!