Hello everyone, if you don't know much about the heavy gasoline smell of automobile exhaust, don't worry. Today, let me share with you the knowledge about the heavy gasoline smell of automobile exhaust. I will analyze the problem of why automobile exhaust has a gasoline smell for you. I hope it can solve your problems. Let's get started!

Why does automobile exhaust have a gasoline smell?

1. The exhaust contains a gasoline smell during cold start, which is normal. Because when the vehicle is cold started, it is in an open loop state. The automobile ECU provides intake air quantity and fuel injection quantity based on the current temperature and preset program. The concentration of the mixture is not in the optimal state, resulting in incomplete combustion. A large amount of fuel is discharged without being burned, and the three-way catalytic converter is at a low temperature and not working, so it cannot catalyze the fuel in the exhaust. These fuels are directly discharged, naturally causing the smell of gasoline.

2. If there is still a gasoline smell during warm-up, it is not normal. It is necessary to check the fuel line, carbon canister, and other systems for leaks. Some vehicles burn oil, and the exhaust has an odor, which is caused by the combustion of engine oil and is a kind of burnt smell. If the vehicle burns oil, it must be repaired immediately. If it lasts for a long time, it will cause premature wear of the engine, reduce the service life, and damage the oxygen sensor and three-way catalytic converter. The exhaust emissions will also be abnormal, and the vehicle will not pass the emission test.

3. The vehicle emits a foul smell in the hot idle state, neither a gasoline smell nor a burnt oil smell. It can occur at idle or high rpm. Sometimes it is accompanied by phenomena such as weak acceleration of the vehicle and a sharp increase in fuel consumption. Once this happens, we can determine that the vehicle's exhaust emissions are seriously exceeding the standards, mainly excessive carbon monoxide (CO). CO is a toxic gas that can cause death if it is severe.

Why is there a heavy gasoline smell in the automobile exhaust at idle?

Because the flammable mixture is too rich, the gasoline smell in the automobile exhaust becomes heavier.

Idle is particularly harmful to vehicles, mainly manifested in the following aspects. Different vehicles consume different amounts of fuel during idle. Some vehicles can consume 1 liter of fuel if they idle for more than an hour, and some even more, possibly up to 6 or 7 liters. Exhaust emissions, during idle, there will be a large amount of exhaust gas in the cylinder of the vehicle, which will cause increased emissions.

Why is there a heavy gasoline smell in automobile exhaust in summer?

Tianjin Shengwei Technology answers for you:

If the gasoline smell is not very strong and there is no gasoline smell when the car is restarted shortly after turning off, then there is no major problem. If the temperature rises and the problem is not relieved, or if there is a strong gasoline smell, check the spark plugs, cylinder wires, ignition coils, and throttle bodies. Secondly, it is generally caused by excessive gasoline. First, check if the fuel injectors have oil leakage, check various sensors and computer signals, and check if the fuel injection amount correction value during cold start is abnormal. It is best to go to a 4S shop for testing.