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The cat does control NOX. But these normally have a very long service life. The way they usually die is from excessive fuel being put through the engine (high CO%), but you did not describe this condition.Fiero coughs and lags when accelerating quickly, tach seems to spike and idle is inconsistant?
However high NOX can also be caused by incomplete combustion from a lean burn condition. One cause is a clogged fuel filter.
The cooling system is also critical for controlling NOX. A malfunctioning or incorrect temperature thermostat will elevate this reading.
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EGR valve not operating correctly will also elevate NOX.
Those are the primary reasons for failing this portion of the smog test. Best to pay a diagnostic fee to determine root cause. Replacing parts gets very expensive.
Marc
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high NOx levels are frequently caused by a car that is running too hot or too lean, you may want to replace your fuel filter and run a fuel system cleaner and try again. Its not all that common to see high NOx from a bad cat, ussually that causes high HC (hydrocarbon)New tires with sidewall cracking?
Pretty much your EGR, I had a similar problem on an old minivan that failed, and the dealership replaced it, even if it didn't throw the check engine light. So, like the #2 answer, is most likely the EGR valve.Heater problems in 96 cavalier..?
secret to passing e-check. first make sure you have a fresh oil change. new air filter, plugs, wires cap and rotor (if your car has a cap and rotor, some dont now). clean the throttle body with some throttle body cleaner. put a couple of bottles of dry gas in your tank with your gas. then get the car up to operating temperature, 195 degrees farenheit, or middle of the guage. DO NOT turn your engine off while you are waiting in line at the echeck station. its important that its a hot engine. passes every time.How do I know if I have the right dipstick for my engine? I get a high oil level reading.?
First of all, NOx is not caused by a lean condition. Nox is produced more from cold engines that aren't yet up to operating temperature than anything else, therefore not completely burning ALL the gasses in the combustion chamber. Check your EGR valve and smog pump, if your vehicle has one. Check your O2 sensor also, as this can cause a run rich condition. Make sure your car isn't running too cold, if it is change the thermostat with a higher temperature rated one. Thermostats are set to open at a certain temp, and there ARE different ones you can buy to make your car run hotter or colder.More Questions & Answers ...
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