What is the reason for the smell of gasoline in the exhaust pipe of a gasoline car?

What's wrong with the smell of gasoline in car exhaust?

Let's take a look at the carbon black situation of the exhaust pipe, generally speaking: the car exhaust and the engine carbon deposit are twins.

Carbon deposits are constantly generated, just like dust in daily life, and only by constantly cleaning up carbon deposits will car exhaust not exceed the standard. How to tell if the exhaust gas will exceed the standard? Is the carbon deposit in the engine serious?

First of all, you have to learn a simple way to judge: that is, the car: observe the exhaust pipe.

Hopefully, you can become a === engine carbon deposition expert. and car exhaust specialists. The following conditions occur in the tailpipe.

1 Carbon-free: Wipe the test tail pipe with white paper, only pale yellow. == The engine has no carbon deposit, and the exhaust is odorless

2 Floating carbon: In the same way, it is found that there is a little black carbon in the exhaust pipe, and there is not much left == when you pat it gently, the engine is normal. , the exhaust is basically odorless.

3. Thick carbon: Using the same method, it was found that a lot of black carbon in the tail pipe was very thick, and after slapping the white paper, there was still a lot of carbon black, which needed to be cleaned up in time. You can smell gasoline.

4. Oil and carbon: In the same way, it is found that the white paper has black carbon, and there are oil stains, and there is a situation of burning engine oil, and the exhaust gas will be very large and pungent. Timely repairs are required. Otherwise, it is not a matter of cleaning up carbon deposits and exhaust gases.

5 Oil and carbon plus smoke: It can be judged that there is a serious problem with the engine due to carbon deposits and other reasons. Professional car repair is required.

6 If the spark plug is disassembled, the basic judgment method is the same, which is to see whether the spark plug head has carbon and oil. There are seven colors to judge. Vehicle exhaust and carbon deposits.

7. Buckle space: Jiuqi Liu'er Jiushan Temple --- use - DP engine container - 30 minutes to clean up engine carbon deposits, 300,000 kilometers of net exhaust fuel saving. --Use --dp engine beauty container 30 minutes to start cleaning up the engine carbon deposits refers to:

Use a white towel to put it at the tail pipe, and you can see carbon black particles on the white towel when you step on the accelerator, which proves that the carbon deposit has been cleaned; 300,000 kilometers of net exhaust fuel saving means: when the engine carbon deposition is cleaned up, the car exhaust pipe will have less carbon until there is no carbon black. Because the carbon deposits in the engine are automatically removed, the exhaust does not smell of gasoline.

Carbon removal = fuel saving = net exhaust qq space: Jiuqi Jiushan Temple.

1. It is normal for the exhaust gas to contain the smell of raw gasoline during cold start. Because the vehicle is in an open-loop state during cold start, the ECU of the car provides air intake and fuel injection according to the temperature at that time and the preset program, the mixture concentration is not in the best state, resulting in insufficient combustion, a large amount of fuel is discharged without combustion, and the three-way catalytic converter has a low temperature and is not working, which cannot catalyze the fuel in the exhaust.

2. If there is still the smell of raw gasoline when the car is hot, it is not normal. Systems such as fuel lines, carbon canisters, etc., need to be inspected to see if there are any leaks. Some vehicles burn engine oil, and the exhaust gas also has a peculiar smell, which is caused by the combustion of engine oil, a burnt smell.

If the vehicle burns oil, it must be repaired immediately, which can cause premature wear and tear of the engine, reduce the service life, and damage the oxygen sensor and three-way catalytic converter. Exhaust emissions will also be abnormal, and the annual inspection will not pass the exhaust gas test.

3. The smell of the vehicle in the hot state is neither the smell of raw gasoline nor the burnt smell of burning engine oil. It can occur at hot idling or high revs. In some cases, it is accompanied by the phenomenon of weak acceleration of the vehicle and a sharp increase in fuel consumption.

Once this situation occurs, we can conclude that the exhaust gas of the car is seriously exceeded, mainly CO exceededs, CO is a toxic gas, which can seriously cause death.

Gasoline burns inadequately. Timing is right! Check the lower injector and spark plugs! If it's an EFI truck, check the oxygen sensor as well.

Hello: Regarding the question you asked, first of all, according to the situation you described, if there is an obvious gasoline smell in the exhaust gas discharged from the exhaust pipe, then most of the cases are caused by incomplete and insufficient combustion of the fuel mixture, which generally involves the following two reasons, one may be that the mixture is too thick, and then there is the possibility that the ignition quality is too weak due to the poor working condition of the engine ignition system, For specific reasons, it is recommended that you go to the repair shop for further on-site inspection and analysis according to the above analysis and combined with the actual situation of the vehicle.

The fuel is not burned sufficiently. The ignition timing needs to be adjusted. Hope it helps.

If it is normal to have the smell of gasoline when starting, the source is because when the car starts cold, the ECU will appropriately increase the amount of fuel injected according to the inlet air temperature and water temperature signal, at this time the engine has not reached the normal working temperature, the oil and gas can not be fully combusted, and a very small part of the oil and gas that has not been fully burned is discharged, which will smell gasoline. When the engine reaches the normal operating temperature of 80-90 degrees, the oil and gas in the cylinder are fully combusted, and the gasoline smell disappears. This is normal.

What is the reason why the rear of the car can clearly smell gasoline when the car is started cold?

The reasons for the strong smell of gasoline in the exhaust pipe are: 1. The spark plug has carbon deposits or ablation; 2. The pressure of the air intake system is insufficient or the air intake is insufficient; 3. Leakage of cylinder line; 4. The oxygen sensor works abnormally. The exhaust pipe is a part of the engine exhaust system, the exhaust system mainly includes the exhaust manifold, the exhaust pipe and the muffler, generally to control the emission of engine pollutants The three-school catalytic converter is also installed in the exhaust system, and the exhaust pipe generally includes the front exhaust pipe and the rear exhaust pipe.

The maintenance methods of the exhaust pipe are: 1. Do not drive in high load and low gear for a long time, which will cause damage to the engine and muffler; 2. Do not hit the throttle at high speed for a long time.

1 normal performance bai, whether it is an electric du injection or a carburetor motorcycle, there will be a pungent taste, so if you feel this change when the vehicle starts at the beginning, just leave it alone.

2.Insufficient combustion, in addition to normal performance, this phenomenon is directly related to the poor combustion state of the motorcycle, if you can smell a more pungent smell of gas and oil, it is basically caused by insufficient combustion.

There are many reasons why the motorcycle does not burn sufficiently, but it is mainly directly related to the fuel supply system, usually checking the air filter, cleaning the oil supply system, this kind of failure will basically disappear.

3.If the pungent smell is not gasoline, but a strange smell, then it is basically caused by burning oil.

When the car starts cold, the fuel injection nozzle is relatively large, and the gasoline that is not fully burned is discharged from the exhaust pipe, so the gasoline smell is relatively large.

Hello pro, the smell of gasoline in the exhaust of the car is caused by insufficient combustion of the engine. 1. There are many reasons for this phenomenon, mainly because the temperature of the three-way catalytic converter is not enough when the car is cold started; 2. Poor combustion condition and aging of three-way catalytic converter in the hot state of the engine; 3. Caused by oxygen sensor failure, water temperature sensor failure, fuel injector failure, etc. Gasoline is highly volatile, and during the rotation of the engine, the gasoline nozzle works to deliver the gasoline to the engine cylinder, and the car will inject more gasoline during the cold start.

Therefore, before the engine is fully running, there must be a mixture of gases that reach the exhaust pipe before combustion, so the volatile gasoline reaches the air body through the exhaust pipe, but these mixtures are treated by spark plugs. So there is not only gasoline in the composition, but also other gases, which will burn slowly when the engine starts cold, which will also cause gasoline to be discharged from the exhaust pipe.

What color is the exhaust gas? Blackened? If it is blackened, it means that the mixing gas is too thick and the combustion is not good, and the gasoline that cannot be burned forms black carbon particles, which forms black smoke after discharge, or the spark plug is not working, resulting in the ignition advance angle is too small and thus causes incomplete combustion.

If white smoke is emitted, it is because the individual cylinders of the ignition system are not ignited, and the mixed gas entering the cylinder is directly discharged without combustion, and the gasoline vapor is condensed into white smoke again.

The gasoline did not burn completely.

The smell of gasoline in automobile exhaust is generally caused by the following conditions:

1. The gasket in the fuel tank cap is aging or uneven;

2. The fuel injector and throttle have not been cleaned for a long time, resulting in dirt, resulting in insufficient gasoline combustion;

3. The gasoline filter is dirty or the connecting hose interface is loose and aging;

4. The gasoline purification carbon canister is dirty or invalid;

5. The connecting hose of the fuel tank is aging and loose;

6. The sealing performance of the car is not good.

1. It is normal for the exhaust gas to have gasoline and smell when the car is cold started, this is because the engine is not fully burned when the water temperature is low, and some unburned gasoline will be discharged from the exhaust pipe, and at the same time, in order to start the engine at low temperature, the engine computer will increase the fuel supply to maintain the engine speed, which will aggravate the gasoline smell.

2. Another reason is that the three-way catalytic converter has not entered the working state under low temperature conditions, so the exhaust gas is directly discharged without treatment, and when the engine water temperature reaches normal, there is no gasoline smell when the engine is normal.

3. If your car smells of gasoline whether it is a hot start or a cold start, then you need to check your car. In addition, when the throttle accelerates, it should also be accompanied by the symptoms of black smoke coming out of the barrel. This is an over-concentrated injection that can be detected and analyzed by a computer.

1. It is normal for the exhaust gas of the car to smell of gasoline when it is cold started, this is because the engine is not fully burned when the water temperature is low, and some unburned gasoline will be discharged from the exhaust pipe, and at the same time, in order for the engine to start smoothly at low temperature, the engine computer will increase the fuel supply to maintain the engine speed, which will aggravate the gasoline smell.

2. Another reason is that the three-way catalytic converter has not yet entered the working state under low temperature conditions, so the exhaust gas is directly discharged without treatment, and when the engine water temperature reaches normal, there is no gasoline smell and the engine is normal.

3. If your car smells of gasoline whether it is a hot start or a cold start, then you need to check your car. In addition, when the throttle accelerates, it should also be accompanied by the symptoms of black stare smoke from the row. This is an over-concentrated injection that can be detected and analyzed by a computer.