Why is the idle unstable after the valve clearance of the Wuling Xingwang engine is reduced

The first situation is that the valve is adjusted smaller than the real one, and the air intake is too small, while the oil supply is appropriate, but because you adjust it too little, the air intake is too small, so that the oil is more than the intake. The combustion will not be sufficient, and the power given by the piston will be stuck. Working at idle speed requires very little oil intake, and the air intake at idle speed is enough to make it smaller, and you want it to get less air than when you are idling, do you say it can be stable?

Fuel supply system, do you check the fuel injector, and the fuel supply pressure is enough?

Kiss! The French car repair engineer will answer for you: it should be when the valve is adjusted, the gap of the adjustment is too small, resulting in the valve is not completely closed and leaks when the valve is closed, which will lead to poor work of individual cylinders, and the idle speed will naturally shake.

Kiss! If you help you, thank you (yours is my motivation!)

Small valve clearance causes the intake valve to open early. Because the vacuum in the manifold is small at idling. Opening the intake valve early will cause the exhaust stroke to be exhausted and the suction manifold will be charged.

The next intake stroke then draws the gas back into the combustion chamber for combustion. However, there is too much gas in the combustion chamber, and the fresh air is relatively insufficient, causing the engine to tremble.

It is because the mixture is too thin ,......Caused by incomplete combustion, the normal valve clearance is.

Unstable idling can be due to the following reasons:

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. The throttle and air intake tract accumulate too much dirt.

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 failure of the spark plug will make the car appear "lack of fire" symptoms, but the spark plug of individual cylinders will have a slight fault and the idle instability will occur.

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.

Hello, the current number of people consulted may not reply in a timely manner, if it is a vehicle failure problem, it is recommended to use the computer to detect the specific cause of the failure, search for "car master" can be consulted at any time to ask the car to ask the question, 24 hours ** answer.

Shaking when the car is idling is a common problem of all kinds of cars, especially after the cold start, it is more likely to idle unstable or the body shakes. The most fundamental cause of the jitter phenomenon is poor combustion in the cylinder. If the combustion is not good, the power provided by the car will not be enough, and the car will shake.

Let's take a look at 6 reasons why cars are unstable and shake at idle. The cause of unstable idle jitter of the car is 1: The mixing ratio is not appropriate, resulting in jitter.

If the oil-gas mixing ratio in the engine compartment of the car is not adjusted accurately, the car will easily shake. In a closed-loop controlled car, the minimum operating temperature of the oxygen sensor is 370 degrees Celsius, and if the car is just started, the oxygen sensor does not work because the temperature in the exhaust pipe does not reach 370 degrees Celsius. At this time, the ECU misjudges, and the control of the oil and gas mixing and ignition time through the actuator has an error, thereby reducing the power output of the car and causing shaking.

The cause of unstable and jitter of the car at idle speed is 2: the ignition energy is low and causes jitter.

The first problem faced by the car when it starts cold is low temperature, the temperature in the engine is not enough, and the temperature of fuel and lubricating oil is not enough, so more fuel should be injected to meet the requirements of power during cold start. The greater the gap between the spark plugs, the smaller the ignition energy. When the fuel atomization is not good at low temperature, the fuel needs higher ignition energy, and the ignition gap of the spark plug is easy to become larger when the car is used for a long time, resulting in a decrease in ignition energy, which affects the dynamics and makes the car shake.

The idle speed is unstable or about 30,000 kilometers to clean. There are 2 ways to clean the throttle: one is no-wash.

Because the computer has a memory function, has adapted to the state before the throttle cleaning, after the cleaning of the throttle opening changes (even if it is very small) directly reflected to the computer, there are two kinds of signals, the common phenomenon is idle high and low or high idle, so after cleaning the throttle is recommended to use the detection computer to match.

Everyone has many times when they are confused, feeling that the future is far away, and they don't know where to go next. In fact, think about it, since you can't ** the future, then why spend a lot of time hesitating, why not use it to do something practical, and live a solid life every day! Looking back at it three or five years later, those who are confused are still confused, and you have already been reborn.

Don't be troubled by the trivial things of life, don't be sad because of the love of your children, don't complain because of the changes in the world, and don't resent because of ill-fated circumstances. Behind every suffering in life is a clear sky.

Motorcycle valve adjustment clearance is generally as follows:

Automobile valve adjustment clearance is generally as follows:

If the novice hand has not been adjusted, it needs to be adjusted with the help of feeler gauge to ensure the accuracy of the valve adjustment clearance and give full play to the best performance of the vehicle without failure.

The idle speed fluctuates high and low, which is generally a problem of unstable mixture concentration or gas distribution, not a valve problem. The characteristics of the valve problem are that the cold start is difficult, and the idle speed cannot be maintained stably after starting and then the ignition will stall, and the idle speed will not be high or low, and it will not suddenly be high to 3000 rpm. The sudden high and low of the idle speed to 3000 rpm is very likely to be due to damage to the carburetor idle mechanism, or the uneven elongation of the timing chain, or damage to the cam or cam bearing and bearing seat, and the last possibility is that the throttle is slightly loose.

All in all, it's a matter of carburetor and valve.

The valve clearance is adjusted too small.

Are you **, I originally drove the 06 model, and now I sell this car, and the EFI car is like this. It's okay to trot 80 miles with power, but it will consume fuel if you run 100. If the idle speed is unstable, you see if the throttle is to be cleaned.

Change a good gasoline grid, style idle motor, you said that it is not the original, Wuling Xingwang can also I drove for 4 years and 8 months, the engine did not turn on, at the end of the past year, I changed Wuling Light, my Wuling Xingwang also sold 15000

Focus on checking the throttle position sensor. Poor contact contact at idle speed and poor contact with circuit may occur. Also, who says there's no idle motor? Single-point EFI also has an idle motor. Check the idle motor data, or try it on a different normal car.

, Wuling Xingwang car idle unstable, sometimes high and sometimes normal causes and solutions: 1, the idle switch is not closed.

Diagnosis method: Turn on the air conditioner and turn on the steering wheel when idling The engine speed does not rise, which can prove to be this fault.

Troubleshooting: Adjust, repair, or replace the throttle position sensor.

2. Idle control valve (ISC) failure.

Diagnostic method: Check the actuation sound of the idle control valve, if there is no actuation sound, the idle control valve is faulty.

Troubleshooting: Clean or change the idle control valve, and use a special decoder to set the idle speed basically.

3. Air leakage in the air intake pipeline.

Diagnostic Method: If you hear a snorting sound of a leak in the intake pipe, it is evidence of a leak in the air intake system.

Troubleshooting: Find leaks, reseal or replace phase parts.

1. After the "new idle motor", use the computer detector to clear and restore the data of the driving computer?

2. If the data has been cleared or restored. Please clean the [throttle body assembly] with a cleaning agent.

3. If it is cleaned, there is no effect. Replace the throttle body assembly (the idle motor is included in the assembly). Please use regular accessories.

After the assembly is replaced, clear and restore the data.

Clean the throttle and replace the spark plugs.