What s the deal with high carbon dioxide in car inspection? What to do if the carbon monoxide CO i

What should I do if the carbon dioxide is high in the car inspection? I think it's because of some glitch that his height is, and you can do a full test so that you can know where the problem is, and then solve it according to the problem.

High carbon dioxide is a joke, but it actually refers to the unqualified exhaust of the car (serious carbon deposit). The main reason for the unqualified exhaust gas is that the mixture is too thick or too thin. It is recommended to check that the resistance of the high-voltage line is not too large; Check the spark plug again, whether the gap is too large; Then remove the fuel injector to detect the atomization status and sealing; It is also necessary to check whether the three-way catalytic converter and oxygen sensor are faulty, resulting in all the values in the emission not meeting the standard.

Therefore, the same kind of detection, adjust what should be adjusted, replace it if it is broken, and resolutely do not change it if it can be used. Remind you that if a large amount of carbon deposits accumulate in the intake system and engine combustion chamber, the carbon deposits will form multiple open flames in the cylinder, so that the phenomenon of multi-point ignition occurs in the cylinder, and the mixture will deflagrate rapidly in a relatively short period of time, and the combustion temperature in the cylinder will rise, which will easily promote the generation of nitrogen oxides.

It is recommended to thoroughly clean the air intake system and the inside of the engine for carbon deposits; It is also possible to delay the ignition timing a bit, which will also reduce NOx emissions.

Due to the delay in ignition, the combustion time in the combustion chamber will be shortened, the maximum combustion temperature will be reduced, and the carbon and nitrogen oxides emitted will be reduced. However, this will lead to a decrease in engine power. However, delaying ignition too much will also cause the CO to have no time to completely oxidize in the combustion chamber, resulting in an increase in emissions.

It may be that the carbon deposition of the car is more serious, and it is recommended to check whether the three-way catalysis and oxygen sensors are faulty.

To inspect the car and see that the acid is high, you can go to the 4S store to check it and overhaul it.

Check the engine combustion.

If the combustion is not normal and the spark plug is black, check the atomization of the fuel injector. Prioritize cleaning the fuel injector, if the combustion is normal, the spark plug color is normal, and check the exhaust oxygen sensor. Check the three-way catalytic converter if necessary.

If the exhaust gas exceeds the standard, before your vehicle goes online, the engine will be warmed up for about an hour, and the car will not be extinguished before the online inspection, and the exhaust gas will be qualified.

My car usually drives less, a tank of 92 oil has not been used up for a month, it was inspected last year, the journey is 15 minutes, CO is more than doubled, HC is, NOX is. My solution: the annual inspection order is valid within a month, the second environmental re-inspection within a month to go for free, I bought a bottle of three-way catalytic cleaning agent 300ml and a set of original spark plugs (the original spark plugs have been used for 72,000 kilometers has not been replaced), just have something to go back to their hometown, run the high-speed fuel tank and have a small number of points left with the three-way catalyst cleaning agent, run almost 70 kilometers after the service area, the service area gas station for the 95 oil filled, ran about 300 kilometers, The next day, the roadside car repair shop asked the master to help replace a set of spark plugs he bought, by the way, the front oxygen sensor was removed and looked at, it was normal, and the three-way catalysis was seen from the front oxygen sensor hole with the mobile phone light, and there was no blockage, and then I listened to the master's suggestion to go to the Sinopec gas station to add fuel treasure 100ml, which sold very expensive 40 yuan, ** You can buy 10 bottles, the fuel tank oil can also run 300 kilometers, or add 100 yuan of No. 95 oil, and then go to the testing station, the journey is 15 minutes, in order to heat up the car well, Change the manual driving mode, keep the speed between 2500-3000 rpm, the highest speed on the third ring line is 80 yards, switch to automatic gear one minute before the detection station, the car has not turned off, parking does not turn off, the window submits the driving license to say environmental protection re-inspection, after registration, directly online detection of environmental protection, detection passed, CO value, NOX value.

Summing up, the spark plug and the previous tank of 92 oil are used for too long, usually the car is in good condition, the car is less driven, it is recommended to add less oil each time, about 100 yuan.

Preheat the vehicle first and then go to the testing line, if it is not qualified, contact the manufacturer to replace the vehicle nitrogen oxygen sensor.

If formal channels can't solve it, then change your thinking.

Maybe someone else's car is too high, but he found the right relationship, took another path, and "convinced" the person who tested the exhaust.

As long as your car is not old-fashioned and the traffic management bureau allows it to be on the road, there is hope that the exhaust gas will be qualified.

The exhaust gas of the old car must exceed the standard, so the car inspection has to find nn. Xiao Yang 13776345670 and look for him.

Clean the throttle. Clean the oil circuit.

If the automobile exhaust gas inspection fails, it is best to replace it with a new three-way catalytic converter. It is advisable to send the car to a repair shop for inspection and repair. Because of the limited tools and expertise at hand, it is not recommended to debug by yourself.

The excess air coefficient is also known as the "excess air coefficient", "excess air coefficient", and is commonly known as the "residual air coefficient". Refers to the ratio of the amount of air actually supplied to the fuel combustion to the theoretical amount of air. It is an important parameter that reflects the ratio of fuel to air, and is often represented by the symbol "".

Its value can be measured by means of a gas analyzer.

In various furnaces or combustion chambers, in order to make the fuel burn as completely as possible, the actual amount of air supplied must always be greater than the theoretical amount of air (the excess part is called the "excess air volume"), that is, the excess air coefficient must be greater than 1. However, combustion theory and operating experience show that too much or too little (indicating too much or too little air supply) is not good for combustion, that is, different combustion equipment has its own optimal excess air coefficient value.

1. At this time, the fuel is incompletely burned with the oxygen in the air, and the concentrated mixture is produced; >1, it is a dilute mixture.

Excess air coefficient = , which is called the upper limit of flame propagation, the mixture is too thick to burn.

Excess air coefficient = , known as the power mixture, with maximum engine power.

Excess air coefficient = 1, which is called the theoretical mixture.

Excess air coefficient = , known as the economy mixture, with minimal fuel consumption.

Excess air coefficient = , which is called the lower flame propagation limit, and the mixture is too thin to burn.

The excess coefficient is determined by the nature of the fuel and the method of combustion.

If the excess air coefficient is high, it must be tested and repaired in the repair shop.

Excess Air Coefficient = Actual Air Quality Supplied by Burning 1 kg of Fuel Theoretical Air Quality Required to Completely Burn 1 kg of Fuel.

Excess air coefficient = 1 is best.

Excess Air Coefficient"1 indicates that the combustible mixture is too thin, which may be a clogged fuel injector, a faulty oxygen sensor, etc. The excess air coefficient <1 said.

If the flammable mixture is too thick, it may be that the air filter is too dirty, clogged, or other faults.

The "excess air coefficient" of a car generally refers to the environmental emission standards of the vehicle. There are different standards for different periods. That is to say, the pollutant substances in the exhaust gas have different indicators (different emission standards), so the detection refers to the urban environmental protection emission requirements at that time, and compares the test index results of the vehicle to judge whether the environmental protection emission standards of the vehicle meet the standard.

Naturally, it is not difficult to distinguish the result, and if the coefficient is too "high", it will exceed the standard. It is not possible to be too "low", only it is possible to be slightly lower or closer to the standard. If the "coefficient is high", it should be inspected, judged and analyzed from the "operating conditions and maintenance" of the vehicle, and then the necessary maintenance and overhaul of the vehicle should be carried out according to the test results to achieve environmental protection qualification.

Automobile detection of "excessive air communication number, too high" (exhaust gas does not meet the standard) usually has the following phenomena:

1) The engine is in poor working condition and the work is not normal.

This aspect is mostly due to maintenance reasons, materials used reasons, human reasons (such as not timely) and so on.

2) Abnormalities in individual components or systems.

Such as carbon deposition in the throttle part, carbon deposition in the spark plug, abnormal ignition, abnormal crankshaft ventilation, etc. can lead to emissions not meeting the standard.

Crankshaft ventilation system:

When the ventilation system is clogged or stuck, the crankcase pressure increases and the mixture thickens. If the ventilation system leaks or the PCV valve gets stuck in the open position or is excessively worn, the vacuum level of the intake manifold will decrease. Especially in carburetor vehicles, the idle mixture will be too thin; The mixture is too thin for gasoline injection vehicles using the MAF system, and thick mixture for gasoline injection vehicles using the MAP system.

After the canister engine is started, the air goes up to the canister, and the HC in the activated carbon is entrusted to it. After entering the air intake, it participates in combustion. If the filter is clogged or its interior is clogged, air cannot enter people, and a large amount of HC collects inside the canister.

If the purification device fails, not only the exhaust gas is not up to standard, but also can cause a certain "gas and oil smell" inside and outside the car.

EGR exhaust gas circulation.

The main function of the exhaust gas recirculation system is to reduce the "NOx". The EGR does not work at both idle and full load conditions, while under normal load conditions, the EGR will participate in the exhaust gas cycle. When there is a failure, the natural emissions are not up to standard.

Contact catalysis. General vehicles are equipped with this device, if it fails, or due to quality reasons, its direct consequence is that the emission is not up to standard, the air coefficient is excessive.

4) Fuel quality.

This car owners know that fuel is a key, fuel is unqualified, too many impurities, lead and other heavy metal components are too large can lead to abnormal emissions.

5) The gas distribution phase and ignition timing also affect the emission of the vehicle.

That's how I understand it. It is also caused by the inefficiency of three-way catalysis, which needs to be cleaned or even replaced. Because if the three-way catalytic fails, it is bound to emit high HC, so the computer will give a signal to increase the air-fuel ratio.

The end result is an increase in the coefficient of excess air, or even a high HC at the same time.

Drive the car back to the 4S shop and let the repair manufacturer help you solve it.

After adding fuel treasure to review the car, it may be that there is a problem with the fuel treasure you bought, or find a manual cleaning shop, clean it thoroughly.

High nitrogen oxygen content, is a combustion problem or a post-treatment problem, first check whether there is a fault code, see if the problem may be in the **, it is not easy to solve it yourself, or go to a larger repair shop.

There are several ways to deal with unqualified carbon monoxide (CO) in the vehicle inspection:

Replace the spark plug. (Both old and new, as long as the electrode points are cleaned with sandpaper, the gap can be adjusted, and my own is the old spark plug replaced).

Clean the distributor contacts and distributor contacts.

Adjust the ignition time. (Delay ignition time, this will significantly reduce the amount of NO (nitric oxide) in the exhaust gas, which is crucial, so be sure to remember!) Due to the delay in ignition, the combustion time in the combustion chamber will be shortened, the maximum combustion temperature will be reduced, and the hydrocarbons and nitrogen oxides emitted will be reduced.

However, this will result in a decrease in engine power. It is also commonly known as the big fire head and the small fire head is to make the fire smaller, and when is it good? Adjust the fire head to the limit, as long as you can run on the high-speed around the city, it can reach 100km hours, because the adjustment is too late, the car can not run, and you can adjust it back after testing.

Clean the air filter. (If it is too dirty, it is recommended to replace).

Clean the throttle with a cleaning agent.

Clean the three-way catalytic converter and oxygen sensor. (After the three-way catalytic converter was removed, I rinsed it with tap water, and at first it was coffee-colored water, and then it was fine, and the two ends were changed.) There should be other better and more thorough cleaning methods, such as banana water, dilute hydrochloric acid is also available, please also be able to provide friendly services, so that the majority of riders can benefit).

Change to 97 petrol or 97 ethanol petrol.

Pull section high speed. (The engine is at high speed, which can clean the engine carbon deposit and the smoothness of the three-way catalytic converter in the exhaust pipe, so that the three-way catalytic converter can work more effectively).

Before filling out the form at the testing station and waiting for the test, you must keep the car idling and warming. (The three-way catalytic converter is effective at high temperature in hot cars, characteristics: its working temperature is about 250-800 °C), I ran dozens of kilometers without delay and went directly to the testing station for testing.

Add some water to the exhaust cylinder with a high-pressure weigher at the car wash near the testing station.

Use a car exhaust purifier. (Add the car exhaust purifier to the fuel tank, idle for 20 minutes or drive 5-10 kilometers, you can reach the standard.) ）

Before testing, keep the engine speed at 4000 rpm and run for 1-2 minutes. Retest.

1.Either fix the car 2Stuff a two-pack of cigarettes to the inspector We generally choose 2 two-word speed.

What should I do if the car fails the annual review and the carbon monoxide exceeds the standard? Newbies beware.

Clean the oil system.