What are the solutions for non-compliant vehicle emissions?

[SanJonathan]

For non-compliant vehicle emissions, replacing the spark plugs can be a solution. Below are relevant methods to address non-compliant vehicle emissions: 1. Replace the spark plugs: Both new and old ones can be used, as long as the electrode points are cleaned with sandpaper and the gap is properly adjusted. 2. Clean the distributor contacts and the rotor contacts: Adjust the ignition timing. Delaying the ignition timing will significantly reduce the NO (nitric oxide) content in the exhaust, which is crucial—please keep this in mind! Delaying the ignition timing shortens the combustion time in the combustion chamber and lowers the peak combustion temperature, thereby reducing the emissions of hydrocarbons and nitrogen oxides. However, this will result in a decrease in engine power.