How to repair the car exhaust gas containing CO unqualified?

The three-way catalysis needs to be cleaned, and it is almost okay to add No. 95 gasoline to the first half tank of fuel on the bottle of fuel treasure.

Reasons for excessive emissions from gasoline vehicles:

The main reasons for the excessive emission and fuel consumption of gasoline vehicles in the control of electricity are poor air intake system, engine carbon deposition, cylinder wear, three-way catalytic converter failure, and oxygen sensor out of control. Different treatment methods should be adopted depending on the cause of the exceedance.

1.First check if the engine is working properly.

Simple inspection can be done, the engine is the heart of the car, check whether the engine is normal, you can remove the spark plug to see if there is oil, very clean means that the ignition is normal, the engine has no oil, increase the throttle when observing, whether the operation is smooth and powerful, if the above inspection is normal.

2.The three major systems of the vehicle are too dirty.

This situation generally appears in the vehicle is still relatively new, but the test results are exceeded, or the excess is not serious only a few percent or tenths of a percent, this situation shows that our vehicle exhaust treatment system, that is, the three-way catalytic converter and oxygen sensing does not have a major problem, the cause of exhaust gas exceeds the standard is mostly because the three major systems of the vehicle (intake system, exhaust system, fuel system) are too dirty.

Change the engine oil (+ oil grid), fire nozzle, air grid, and use a higher grade of gasoline. You should be able to pass the level.

If the car is over eight years old, it is recommended to have a major repair.

1. Ordinary gasoline vehicles.

If the CO exhaust of the car is not up to standard, the vehicle that fails the inspection will be repaired in the repair shop until the final exhaust emission is qualified. Generally, the environmental protection department will recommend the car owner to the auto repair company with high qualifications and strong maintenance capabilities recognized by the traffic management department. However, car owners can also choose other auto repair companies, as long as the final inspection is qualified.

2. "Oil and gas" hybrid vehicles.

If the exhaust gas is found to exceed the emission standard after the exhaust gas test, in addition to going to a reliable repair shop for maintenance in time, the "oil and gas" hybrid vehicle needs a reasonable proportion of fuel.

Because whether the exhaust emissions can meet the standard mainly depends on the three-way catalytic device in the car, which can convert the three main harmful substances in the exhaust gas into harmless substances. If the owner does not burn gasoline and natural gas in a scientific proportion after the car is modified, it will lead to substandard exhaust gas.

Replace the spark plug and clean the fuel injector: the spark plug ignition energy is insufficient, and the mixed oil and gas can not be completely burned, resulting in the HC content in the exhaust gas exceeding the standard, and the fuel injector has a poor atomization degree, and the mixed oil and gas is too concentrated may also lead to the pollutants in the exhaust gas being too high to pass the test.

Replace high-grade gasoline: Compared with low-grade gasoline, the advantages of high-grade gasoline are mainly reflected in the "two highs and two lows": higher knock resistance and power, and lower harmful substances and exhaust pollution in gasoline.

With high-grade gasoline, it is possible to pursue higher engine power and smaller displacement, and improve power and fuel economy. High-grade gasoline is cleaner, and the content of CO, NO, and HC pollutants produced after combustion will be greatly reduced.

Clean or replace the three-way catalytic converter: the exhaust gas is discharged through the exhaust pipe, and the three-way catalytic converter on the exhaust pipe is the most important external purification device in the automobile exhaust system, which can convert the CO, HC and other harmful gases discharged from the automobile exhaust into harmless carbon dioxide, water and nitrogen. Neglecting the maintenance of the three-ring catalytic converter for a long time will lead to the blockage of the three-ring catalytic converter, the ability to convert harmful gases will be reduced, and finally the exhaust emissions will not meet the standard.

If there is a problem with the three-way catalytic converter, you can buy a special cleaning agent to clean it, and if the blockage is serious, you can choose to replace it directly.

The main reason for the substandard automobile exhaust emissions is: the combustion of the combustible mixture gas into the cylinder is incomplete, there are many reasons, it is not difficult for professionals to deal with, the best way to hand over the annual review of the personnel to deal with, they have a set of temporary methods to deal with the exhaust gas is not up to standard, but you have to spend some money.

Repair the engine. Inspect the oil supply system.

If the automobile exhaust CO is unqualified, it will not only affect the annual inspection, but also cause pollution to the environment, so what are the reasons for the unqualified automobile exhaust CO and treatment methods?

1. It may be caused by the fact that the spark plug is not cleaned regularly and there is a lot of carbon deposit, or it may be caused by the spark plug being used for too long and not being replaced in time. It can be improved by cleaning the carbon deposits on the spark plugs, or by replacing the spark plugs.

2. It may be caused by oil stains or carbon deposits on the three-way catalytic converter, which can be cleaned with a special cleaning agent, which can also improve the problem of unqualified automobile exhaust CO.

3. If the purity of the gasoline is not very high, it will also easily cause the car exhaust CO to be unqualified, the best way is not to be greedy for cheap when refueling, and you need to go to the regular state-owned enterprise gas station to refuel.

4. Of course, in order to prevent unqualified automobile exhaust CO, you can also buy new energy vehicles directly when buying a car, so that you don't have to worry about unqualified automobile exhaust CO.

The vehicle exhaust CO is unqualified, and the three-way catalytic converter needs to be cleaned or replaced. If the blockage is severe, the three-way catalytic converter must be removed and cleaned, usually soaked in oxalic acid for a period of time, and then rinsed with water. If it is poisoned and invalid, it needs to be replaced.

The function of three-way catalysis is to oxidize CH and CO into carbon dioxide and water, and reduce nitrogen oxides to nitrogen, which is the key to the detection of exhaust gas. Three-way catalysis is prone to carbon blockage or poisoning and failure, and carbon blockage is reversible and can be reactivated by cleaning.

If the CO in the car exhaust is unqualified, the oxygen sensor also needs to be checked. The oxygen sensor is divided into pre-oxygen and post-oxygen, the pre-oxygen is responsible for detecting the gas after combustion, and once there is carbon deposition or abnormal operation, it will cause the ECU to be unable to properly adjust the mixture. Then oxygen is responsible for detecting the purification effect of the three-way catalysis, and once it is damaged, it cannot be judged whether the three-way catalysis is normal.

The role of the oxygen sensor in the exhaust emission detection is also very important, and it is recommended to check and clean it together with the three-way catalytic converter.

If the CO in the exhaust gas exceeds the standard, it may also be that the engine mixture is too thick, the combustion is not complete, the air intake system is not smooth, the fuel injector is worn, and the cylinder is seriously worn. Check the air filter, spark plug, ignition timing, and after using a high-efficiency detergent, add a dual-core anti-friction repair agent to repair. (Photo by photo:.)

Wu Jiahong) @2019

In the annual inspection, the exhaust gas detection standard is mainly aimed at CO (carbon monoxide), HC, NOX (hydrocarbons and nitrogen oxides), PM (carbon dioxide, soot) and other harmful gases emitted in the exhaust gas. These harmful gases are produced by the engine during combustion operations. There are various reasons for the production of these harmful gases, CO is an intermediate product of incomplete oxidation of fuel, insufficient oxygen will produce CO, and the large concentration of the mixture and the uneven mixture lead to the increase of CO in the exhaust, which is unqualified for CO.

There are two solutions to the unqualified CO of exhaust gas: 1. The spark plug can be replaced if the CO of the automobile exhaust gas detection is unqualified. Ignition system failures such as spark plugs and high-pressure airbags, excessive vehicle displacement, and failure to call the spark plug working condition will aggravate emission pollution; 2. The spark plug is also easy to accumulate carbon, wipe it clean with sandpaper, clean it with detergent, and clean it with detergent to restore the activity, and you can also adjust the ignition gap.

However, when the spark plug fails to ablate or comes to life, it is replaced directly. The three-side spark plug can improve the exhaust gas purification effect, and the CO of the automobile exhaust gas detection can be improved by replacing the three-side spark plug. 3. Compared with the single-sided pole, the spark gap of the multi-side spark plug is composed of the cross-section of the multiple side poles (the virtual hole of the round finger chain) and the cylindrical surface of the central electrode.

This horizontal spark gap eliminates the disadvantage of the side pole covering the central electrode, improves the "reachability" of the spark, and the spark energy is large, and it is easy to enter the cylinder, which helps to improve the combustion condition of the mixture and reduce exhaust emissions.

In the annual inspection, the standard of exhaust gas detection is mainly for CO (carbon monoxide), HC+NOx (hydrocarbons and nitrogen oxides), PM (particulates, soot) and other harmful gases discharged from the exhaust gas. They are all harmful gases produced by the engine during the combustion work process. The causes of these harmful gases are different, and CO is an intermediate product of incomplete fuel oxidation, when the oxygen is not sufficient, CO will be produced, and the large concentration of the mixture and the uneven mixture will increase the CO in the exhaust, and there are the following solutions for the CO disqualification:

1. Clean or replace the three-way catalytic converterThe function of three-way catalysis on the vehicle is to oxidize CH and CO to CO2 and H2 O, and reduce NOx to N2, so it is the key to pass the exhaust gas detection. Three-way catalysis is prone to carbon blockage or poisoning and failure, which is reversible and can be reactivated by cleaning, while poisoning failure and damage need to be replaced. 2. Clean or replace the spark plugsIgnition system failures such as spark plugs and high-pressure packs will also cause vehicle emissions to exceed the standard, and poor spark plug working conditions will cause emission pollution to increase.

The spark plug is also prone to carbon accumulation, and can also be reactivated by sandpaper cleaning or cleaning with cleaning agent, and the ignition gap can also be adjusted. However, if the spark plug is found to have a faulty ablation or has reached the end of its useful life, it will be replaced. 3. Check the oxygen sensorThe oxygen sensor is divided into pre-oxygen and post-oxygen, the pre-oxygen is responsible for detecting the gas after combustion, and once there is carbon deposition or abnormal operation, it will cause the ECU to be unable to properly adjust the mixture. Then oxygen is responsible for detecting the purification effect of the three-way catalysis, and once it is damaged, it cannot be judged whether the three-way catalysis is normal.

Therefore, the role of the oxygen sensor in the exhaust emission detection is also very important, and it is recommended to check and clean it together with the three-way catalytic converter. 4. Deep cleaning of the engineWhat should I do if the three-way catalyst and oxygen sensor are cleaned and the spark plug is replaced, and the vehicle exhaust emissions still do not meet the standard? If this happens, on the premise that there is no fault in the air flow meter, temperature sensor and other sensors, then it is necessary to do a major maintenance of the engine to clean the carbon deposit.

Clean the throttle, oil circuit, air intake, fuel injector, etc., and clean the carbon deposits inside the engine, and the working condition of the engine will be improved a lot. 5. Find scalpersI believe that everyone will be no stranger to scalpers, as long as everyone is willing to pay (different places), then they will bring your vehicle back to life in frequent exhaust gas detection. There are countless cars that fail to pass the exhaust gas test every year, and some of them still can't pass after maintenance, so can they be scrapped directly?

At this time, scalpers become a "straw", no matter what method they use, the result is often satisfactory to the customer anyway. The above is the content of "exhaust CO unqualified solutions" compiled for me, I hope it can help you.

Everyone has some questions about cars to a greater or lesser extent. The following is a brief introduction to me: the solution to the unqualified exhaust CO, if you also want to know, let's take a look at my introduction, I hope it will help you.

Carbon monoxide failure refers to the excess of carbon monoxide in the exhaust gas, because only exceeding the standard is considered qualified. Excessive carbon monoxide in the exhaust gas can be solved by the following methods:

1.Add half a tank of E10 ethanol gasoline. Ethanol has a high oxygen content and supports combustion.

2.Unplug the injectors.

3.Three-way catalysis can be problematic. Because the role of three-way catalysis is to continue to catalyze the incomplete combustion of burning hydrocarbons and carbon monoxide. Solution: Clean or replace the three-way catalyst.

You can also drive at high speed before the car inspection, so that the three-way catalytic converter in the car reaches the catalytic temperature before going to the car inspection. The most important point is that the engine must not be turned off until the vehicle is inspected, this is to keep the three-way catalytic converter at the necessary temperature.

4.It could be an issue with the air cleaner. The air filter is dirty, and the natural combustion is not sufficient. There are two ways to solve this: The first is to clean the air cleaner.

The second is to remove the air filter element before the car inspection and install it after the car inspection. The disadvantage of using this method is that if dust gets into the combustion chamber, it can cause a lot of damage to the engine.

5.Probably an oxygen sensor. The oxygen sensor plays the role of air-to-air fuel ratio adjustment, so that the fuel burns more fully. Once the oxygen sensor is damaged, carbon monoxide will burn inadequately and be high.

Solution: Replace the oxygen sensor.