What is the solution for vehicle CO failure?

[LillianLynn]

Vehicle CO failure solutions are as follows: 1. Replace spark plugs. Both new and old ones are acceptable, as long as the electrode points are cleaned with sandpaper and the gap is properly adjusted. 2. Adjust ignition timing. Delaying the ignition timing will significantly reduce CO content in the exhaust. Since the ignition time is delayed, the combustion time in the combustion chamber will be shortened, the maximum combustion temperature will decrease, and the emissions of hydrocarbons and nitrogen oxides will be reduced. 3. Clean the distributor contacts and distributor rotor contacts. 4. Clean the three-way catalytic converter and oxygen sensor. 5. Add half a tank of E10 ethanol gasoline. Ethanol has a high oxygen content, which aids combustion.