OK so I've been struggling with California emissions for the past 7 months. I have been doing some research to understand why my car has been failing. Here is a general little breakdown on what to do when HC's, CO's, and Nox levels are out of line.
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Hydrocarbon (HC) failure- exceeds established standards for hydrocarbon. This is essentially unburned fuel.
Carbon monoxide(CO) failure- exceeds established standards for carbon monoxide
Oxides of nitrogen (Nox) failure - exceeds established standards for oxides of nitrogen emissions. Oxides of Nitrogen are a byproduct of any combustion in our oxygen/nitrogen atmosphere. High compression engines typically have difficulty achieving low NOx numbers.
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Hydrocarbon (HC) failure- exceeds established standards for hydrocarbon. This is essentially unburned fuel.
~Air to fuel mixture may be too lean or too rich.
~Positive Crankcase Ventilation (PCV) valve may not be functioning properly
~Vacuum leak in the system.
~Exhaust Gas Re-Circulation (EGR) system may not be functioning properly (if equipped).
~Ignition timing may not be properly set.
~One or more spark plugs may not be performing as they should. An ignition misfire. If a spark plug does not spark, the air/fuel mixture in the combustion chamber does not burn and then goes out the tailpipe.
~Catalytic converter may be partially clogged or not properly functioning.
~Ignition system parts are not working properly.
~Internal engine parts or equipment may not be functioning.
~Various engine sensors may not be functioning.
~Positive Crankcase Ventilation (PCV) valve may not be functioning properly
~Vacuum leak in the system.
~Exhaust Gas Re-Circulation (EGR) system may not be functioning properly (if equipped).
~Ignition timing may not be properly set.
~One or more spark plugs may not be performing as they should. An ignition misfire. If a spark plug does not spark, the air/fuel mixture in the combustion chamber does not burn and then goes out the tailpipe.
~Catalytic converter may be partially clogged or not properly functioning.
~Ignition system parts are not working properly.
~Internal engine parts or equipment may not be functioning.
~Various engine sensors may not be functioning.
Carbon monoxide(CO) failure- exceeds established standards for carbon monoxide
~Air to fuel mixture may be too rich.
~Idle speed is not correct.
~Air filter may be partially clogged.
~Choke may not be operating properly.
~Positive Crankcase Ventilation (PCV) valve may not be functioning properly.
~Air or fuel problems, other equipment or engine malfunctions.
~Catalytic converter may be partially clogged or not properly functioning.
~Engine oil may be dirty and needs changing.
~Various engine sensors may not be functioning.
~Idle speed is not correct.
~Air filter may be partially clogged.
~Choke may not be operating properly.
~Positive Crankcase Ventilation (PCV) valve may not be functioning properly.
~Air or fuel problems, other equipment or engine malfunctions.
~Catalytic converter may be partially clogged or not properly functioning.
~Engine oil may be dirty and needs changing.
~Various engine sensors may not be functioning.
Oxides of nitrogen (Nox) failure - exceeds established standards for oxides of nitrogen emissions. Oxides of Nitrogen are a byproduct of any combustion in our oxygen/nitrogen atmosphere. High compression engines typically have difficulty achieving low NOx numbers.
~Engine air to fuel mixture may be too lean.
~Engine’s oxygen sensor may not be functioning properly.
~Improper operation of the Exhaust Gas Re-Circulation (EGR) system
~Malfunction of the engine spark advance system.
~Air intake temperature may be too high.
~Cooling system may not be functioning properly.
~Catalytic converter may be partially clogged or not properly functioning.
~Carbon deposits on the engine intake valves.
~Engine’s oxygen sensor may not be functioning properly.
~Improper operation of the Exhaust Gas Re-Circulation (EGR) system
~Malfunction of the engine spark advance system.
~Air intake temperature may be too high.
~Cooling system may not be functioning properly.
~Catalytic converter may be partially clogged or not properly functioning.
~Carbon deposits on the engine intake valves.
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