How to deal with the unqualified automobile exhaust emission in the annual review

The unqualified automobile exhaust emission is generally caused by carbon deposition, spark plug damage or unqualified fuel quality. So when we can't monitor it for the first time, we should take the vehicle out for maintenance and wait until the maintenance is completed before testing. Maintenance contents mainly include: replacing spark plugs to ensure timely ignition of vehicles. Or clean and replace the air filter element to ensure sufficient air intake in the cylinder and complete fuel combustion. Then clean the carbon deposits on the vehicle, such as accelerator, fuel injector and three-way catalyst. Handling method of unqualified automobile exhaust emission in annual review: 1. I wonder if your car is equipped with a three-way catalytic converter? If not, the most direct way is to install a three-way catalytic converter; In addition, if you don't want to cause so much trouble, you can try to check the gasoline with methanol before the annual inspection last year, and then run it quickly to blow the foreign matter in the exhaust pipe to the maximum extent. In this way, the exhaust pipe can be discharged more cleanly under the annual inspection. 3. However, it is not recommended to use methanol for a long time. Because of its strong corrosiveness, it is easy to cause accelerated wear inside the engine, especially the valves and fuel nozzles. The problem of using methanol once in a short time will not be very serious.