What should I do if the automobile exhaust is not up to standard?

The ways to solve the problem of substandard automobile exhaust are: 1, replace the spark plug; 2. Adjust the ignition time; 3. Clean the throttle with cleaning agent; 4. Switch to No.97 gasoline or No.97 ethanol gasoline; 5. Use automobile exhaust purifying agent; 6, clean the distributor contact and distributor contact; 7. Clean the air filter; 8. Clean the three-way catalytic converter and oxygen sensor. The way to check the country of the vehicle is: 1. Check the motor vehicle certificate: the vehicle certificate clearly records the emission standard of the vehicle; 2. Find the on-board list: find the vehicle emission standard in the vehicle information column; 3. Check the certificate: indicate the corresponding emission standards; 4. Check the environmental protection sign of the vehicle: there are obvious signs on the back of the environmental protection sign of the front windshield of the vehicle, and there are vehicle emission standards.