Excessive Carbon Monoxide (CO) Emission

1. Faulty basic engine parts (clogged air cleaner, vacuum leaks, faulty ignition system, engine compression, etc.).
2. Engine not at normal operating temperature.
3. Lead contamination of catalytic converter.
4. Fuel leakage from injector.
5. Improper fuel pressure.
6. Poor performance of Throttle Position, Water Temp., Air Temp. or Pressure sensors.
7. Faulty ECM.