Is it the reason that the speed of the car is unstable when it starts after it is long?

Eliminate the problem of oil quality, because the engine has a lot of carbon, and it is necessary to clean the fuel injector and throttle, and check and replace the spark plug. Carbon deposits can cause insufficient combustion of gasoline and cause the engine to shake. The impact of engine carbon deposition on the car is quite large, first of all, to reduce the engine power, that is, to make the power output uneven and gradually decay, in other words, more and more powerless.

The second is to increase fuel consumption and increase your financial burden. The third is the difficulty of cold start, that is, the difficulty of ignition, it is not easy to get on the car, and finally the carbon deposit in the combustion chamber is strict, and it will also cause cylinder detonation, and the low-speed acceleration will cause damage to the piston and crankshaft, causing high temperature of the engine and seriously affecting the safety of the car. Then there is the excessive discharge, which not only fails the annual inspection and inspection, but also directly aggravates the harm of polluting the environment.

There is another reason: the throttle valve is faulty. Both of these problems can cause engine shake and unstable speed.

The long-running start-up idle is unstable, indicating that the oil is about to deteriorate.

The reason for the fault phenomenon: because the car is long, the engine temperature is too low to start the vehicle, the computer board in order to speed up the engine warm-up to increase the temperature of the coolant, so: after increasing the amount of fuel injection, the vehicle will idle high after starting, and the engine idle speed will tend to be stable after the coolant temperature of the engine reaches its standard working temperature.

You can drive a distance, stop and see, and if the idle is still unstable, you can match the throttle.

1. The engine has serious carbon deposits.

When the carbon deposit inside the engine is too much, the gasoline sprayed out by the cold start fuel injection head will be absorbed by the carbon deposit in large quantities, resulting in the mixture of cold start being too thin, making it difficult to start, in this case, only when the gasoline absorbed by the carbon deposit is saturated, it is easy to get on the car, and the gasoline adsorbed on the carbon deposit after the car 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, causing idle shaking after cold start.

2. Excessive fouling of the throttle and inlet tract.

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.

3. The spark plug spark caused by individual spark plug failure is too weak.

Spark plugs can also build up carbon, which can be cleaned to restore spark plug activity, but some spark plugs are nearing the end of their useful life and their performance will be reduced. The spark plug spark on the individual cylinder is weak, which will affect the performance of the car, and the spark plug failure will cause the car to have the symptoms of "lack of fire", but the spark plug of the individual cylinder will have idle instability symptoms if there is a slight fault.

4. Fuel pressure failure.

If the oil pressure is too low, the atomization state of the fuel injected from the injector is poor or the fuel injected is linear, and only oil droplets are sprayed in serious cases, and the amount of fuel injected is reduced to make the mixture too thin; The oil pressure is too high, and the actual fuel injection volume increases, making the mixture too concentrated.

5. Failure of various parts.

Leakage of intake manifold or various valves, failure of fuel pressure, low oil pressure, failure of ignition system, etc., can also cause engine idling instability.

Causes of unstable idling:

1. Fuel system BAI

1) Injector failure.

The fuel injection volume of the injector is uneven and the mist is not good, resulting in an imbalance in the power generated by each cylinder. Common causes are: clogged injectors, poor sealing, and linear fuel injection.

2) Fuel pressure failure.

If the oil pressure is too low, the atomization state of the fuel injected from the injector is poor or the fuel injected is linear, and only oil droplets are sprayed in serious cases, and the amount of fuel injected is reduced to make the mixture too thin;

The oil pressure is too high, and the actual fuel injection volume increases, making the mixture too concentrated.

Common causes are: clogged fuel filter; Fuel pump strainer clogged; The fuel pump's pumping capacity is insufficient; The spring elasticity of the fuel pump safety valve is too small; deformation of the inlet pipe; The fuel pressure regulator is faulty; The oil return line is deflated and blocked.

Hello, it may be caused by too much carbon deposit, is it that the car has been purchased for too long? It is advisable to wash the carbon deposits.

You're talking about idling, right? Unstable idle speed is basically a lack of cylinder.

The reasons for the instability of the belt speed of the new car are as follows: Air air filter: If the air filter is not replaced in time, the engine idle speed will be reduced due to insufficient air intake.

Abnormal water temperature: If the engine water temperature is high, the ignition time will be earlier, which will change the oil-gas mixing ratio, and make the oil viscosity thinner (lubricity will become worse). The reasons for the abnormal water temperature are:

Insufficient cold ridge tease, faulty thermostat, faulty fan, inaccurate temperature control switch. Too much carbon deposits in throttle and air flowmeters: throttle and air-air flowmeters are still relatively easy to get dirty.

Nowadays, most cars are electronic throttle valves, and a little carbon deposition can affect it. Excessive carbon deposition on the throttle will cause the throttle to get stuck, the power will drop severely, and the idle speed will be unstable. Nozzle clogged:

The blockage of the nozzle will lead to the inconsistency of the fuel injection volume of each nozzle, resulting in the different working of each cylinder, resulting in unstable ignition idling.