Reasons for Excessive Carbon Monoxide in Vehicle Exhaust

[KimberlyLynn]

Excessive carbon monoxide in the exhaust may be caused by incomplete combustion of gasoline in the engine. The main reasons and solutions are as follows: Main reasons: Spark plug failure, poor ignition, excessive cylinder wall clearance, uncalibrated valve timing, failed catalytic converter, poor fuel injector atomization, etc. Carbon buildup inside the engine fuel system, or a clogged/dirty catalytic converter that has lost its ability to convert carbon monoxide. Solutions: Remove engine carbon deposits, or clean/replace the catalytic converter. The correct solution should be determined based on accurate diagnosis of the excessive emission causes through steady-state exhaust gas test data.