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NOx, or Oxides of Nitrogen, are formed during very high combustion temperatures. It needs to be reduced because NOx are green house gases. In an effort for auto manufacturers to reduce overall harmful exhaust emissions and to increase fuel efficiency, leaner fuel to air ratios have made NOx increase. Manufacturers curb its production by introducing exhaust gases back into the combustion chamber, thereby lowing combustion temperatures. Because eliminating all NOx is nearly impossible if the engine is running properly, manufactures install a last line of defense to clean the NOx out of the exhaust. This last line of defense is the 3-way catalytic converter. It uses semi-precious metals to absorb oxygen and then recombine the oxegen with the NOx to create harmless gases. If you are failing a smog test because of high NOx levels, the following thing need to be checked: 1st, make sure the engine is not overheating; 2nd, make sure the exhaust gas recirculation (EGR) system is functioning properly; 3rd, make sure the catalytic converter is functioning properly. You will probably need a professional mechanic who is adequately trained in emission repairs to perform these tests because they can be very difficult and require special tools. Any means to attempt to change the way the car runs to defeat the NOx test will most likely make the other gases, that previously passed, now fail. I have seen in some cases, when all else fails, put a new catalytic converter on the car, and temporarily it will allow you to pass the test.
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What happens to the nitrogen in an internal combustion engine?
They become oxides of nitrogen or the emission NOx, this is controlled by the EGR valve to lower combustion temperatures and lower the NOx gas wich contributes to phot chemical smog, the stuff you see in the air.
What are the measures to control smog?
Photochemical smog is caused by the mixing of hydrocarbons and NOx in the presence of sunlight. Smog may be controlled by: * Controlling industrial emissions of the precursors * Reducing automobile emissions by reducing traffic or increasing pollution control
What does NOx do?
NOx, or nitrogen oxides, are harmful pollutants produced during the combustion of fossil fuels. They contribute to the formation of smog and acid rain, and can have negative health effects such as respiratory issues. Reducing NOx emissions is important for improving air quality and environmental health.
Does the buyer or seller responsible for a smog test?
the seller is responsible to present the smog test paper while selling the car, the smog test paper is acceptable within the last 90 days.
Can a crankshaft sensor cause a failure to pass smog test?
Probably not as the emissions test (Smog test) is carried out by inserting a sensor into the exhaust pipe.
Will a bad egr cause smog test fail?
yes it suppose to circulate the smoke if clogged smog test will fail
Are NOx gases greenhouse gases?
Yes, NOx gases are considered greenhouse gases. They contribute to global warming by trapping heat in the Earth's atmosphere. Additionally, they play a role in the formation of smog and acid rain.
What is a smog test?
when they check your car!
1979 VW Super Beetle failed CA Smog Fresh motor not driven much for years. Failed NOX test M1 2467 M2 2363 approx 1000 PPM higher than maximum. limit. Any ideas to correct pass Thanks Frank?
Replace either the Catalytic converter or the Smog Pump and Charcoal Canister.
What caused a '94 Nissan altima not to pass smog because of NOx?
possible high combustion temp due to clogged or malfuction of egr system.
What states require a car smog test?
If you visit the site http://www.dmv.org/smog-check.php, you can check which states require a car smog test. Simply click on a state, and it will tell you whether one is required.
Will a vehicle pass smog if the o2 sensor is out?
No, it will not pass the smog test with a defective or removed O2 sensor.
