My Dongfeng Yueda Kia 2 car is unstable at idle, what is the situation?

The main reason for the shaking of the vehicle at idle instability;

1. The most common cause of vehicle shaking is that the throttle is too dirty or the fuel injector has too much carbon.

2. When the carbon deposition inside the engine is too much, the gasoline sprayed by the cold start fuel injector will be absorbed by a large amount of carbon deposition, resulting in the mixture of cold start being too thin, making it difficult to start, in this case, only when the gasoline absorbed by carbon deposition is saturated, it is easy to get started, 3. After the car is adsorbed, the gasoline adsorbed on the carbon deposition will be sucked into the cylinder by the vacuum suction of the engine for combustion, and the mixture becomes thick, and the combustible mixture of the engine is dilute and thick, resulting in idle shaking after cold start. The lower the temperature, the greater the amount of oil required for the cold start, and the more carbon deposits will affect the smooth cold start.

Severe idle vibration is generally caused by engine cylinder failure, aging or loose foot rubber, carbon deposits, fuel system failure, etc.

Solution; The best way is to clean the oil circuit, clean it regularly, and use PNF fuel additives to solve the above problems caused by carbon deposits. The fuel quality is not very good or the initial fuel of the new car is stored for too long, resulting in a rapid increase in the colloidal composition of the oil circuit, which will continue to pollute the fresh fuel and cause no good fuel to participate in combustion in the later stage, and the carbon deposition exceeds the standard, which is especially common for China VI vehicles. We can only gradually alleviate most of the problems by maintaining clean oil circuits.

My Dongfeng Yueda Kia K2 car is unstable when idling, There are generally several reasons for engine idle shaking, the most common reason for the serious carbon deposition of the engine causing the car to shake is that the throttle is too dirty or the fuel injector is too much carbon, because the gasoline adsorbed on the carbon deposit after the car is sucked into the cylinder by the engine for combustion, and the combustible mixture of the engine is dilute and thick, resulting in idle shaking after cold start. Solution: The company has a general idle shake fuel additive to clean the oil circuit, and check whether the idle motor has carbon deposits and should be cleaned.

It seems that it is also a Yuedong rider, and the idle speed of Yuedong is 1600 in winter, and the car will gradually decrease when it is hot.

The direct cause of engine idle instability refers to the dirty, wear, incorrect installation of mechanical parts, etc., which leads to the change of individual cylinder power, resulting in the imbalance of the power of each cylinder, resulting in the engine idling instability;

The indirect cause of engine idle instability refers to the abnormal engine electronic control system, which leads to poor combustion of the mixture, resulting in the difficulty of balancing the power of each cylinder, and making the engine idle unstable.

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(1) Leakage of intake manifold or various valves.

When the air that should not enter, gasoline vapor, and combustion exhaust gas enter the intake manifold, the mixture is too thick or too thin, and the engine burns abnormally. When the leakage position only affects individual cylinders, the engine will shake more violently, which will have a greater impact on the idle speed of the cold car. Common causes are:

loose intake manifold clamp or cracked hose; Air leakage from the intake manifold gasket; Damage to the intake manifold or other parts to grind out of the intake manifold; Injector O-ring leakage; The plug of the vacuum tube falls off and cracks; The crankcase forced ventilation (PCV) valve has a large opening; The activated carbon tank valve is normally open; Exhaust gas recirculation (EGR) valve is not closed tightly, etc.

2) Excessive fouling of the throttle and intake.

The excessive carbon and dirt deposits in the throttle valve and the surrounding air intake, and the change in the cross-sectional area of the air channel, make the control unit unable to accurately control the idle air intake, resulting in the mixture being too thick or too thin, and making the combustion abnormal. Common causes are: oil or carbon deposits on the throttle; There is oil and carbon deposits in the air intake tract around the throttle; Idle stepper motors, duty cycle solenoid valves, and rotary solenoid valves have oil stains and carbon deposits.

Hello, this should be caused by carbon deposition caused by the oil circuit is not smooth, it is recommended to remove the carbon deposition effect will be significantly improved,

Hello: According to the above-mentioned vehicle use phenomenon, combined with the fault phenomenon occurrence conditions, it is recommended to go to the maintenance shop to check the following points: 1. Carbon deposit; Combined with your vehicle condition and maintenance, it is recommended to go to a repair shop to check the throttle valve and idle motor, if there is a large amount of colloidal carbon deposits around the throttle and idle motor, it will cause the mixture to be too thick and too thin.

Due to excessive carbon accumulation and dirt, the cross-sectional area of the air passage changes, so that the control unit cannot accurately control the idle air intake, resulting in the mixture being too thick or too thin. So the ECM repeatedly adjusts the idle speed to the standard value, so you are now "traveling". 2. a load signal; This fault is mainly due to the fact that when the engine increases the load, its load signal is not transmitted to the engine control unit, which will affect the engine power output, resulting in unstable idle or stalling.

3. Engine working conditions; In this case, the engine data flow analysis is also carried out using the service diagnostic, and if the engine water temperature sensor signal is poor or inaccurate, the engine control unit will in some cases adopt a hot car state, so the above phenomenon will also occur.