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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.
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 is the abbreviation for nitrogen oxides (NOx) and how does it contribute to air pollution?
The abbreviation for nitrogen oxides is NOx. NOx contributes to air pollution by reacting with other pollutants in the atmosphere to form smog and acid rain, which can harm human health and the environment.
How can you lower the nox in your smog test?
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.
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.
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 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.
How does ozone form at low altitudes?
Ozone at low altitudes is formed through chemical reactions involving nitrogen oxides (NOx) and volatile organic compounds (VOCs) in the presence of sunlight. This process leads to the production of ground-level ozone, which is a harmful air pollutant that can contribute to respiratory issues and smog formation. Efforts to reduce emissions of NOx and VOCs can help mitigate the formation of ozone at low altitudes.
If a 1993 Camry 4-cyl did not pass smog test reading 1400 for Nox when the max is 700 is the egr valve bad or is there more to fix?
With NOx numbers this high, it says the EGR system isn't working correctly. At idle, the EGR is closed. At speeds, the EGR is open. See if you can move the EGR valve diaphragm by hand when the car is idling. The car should die or want to die. If it doesn't do this, it could be plugged up. Remove the EGR valve and clean any carbon deposits in the valve and also do the same on the engine side where the EGR is connected. Also, to reduce your NOx emissions reading, replace your spark plugs, wires, distributor cap and rotor. Then, retard your timing as much as possible. This can be done by loosening the 10mm nut next to the distributor and turning it clockwise, then re-tighten the bolt.
Photochemical smog is caused by the action on chemicals of what?
Photochemical smog is caused by the action of sunlight on pollutants like nitrogen oxides (NOx) and volatile organic compounds (VOCs) in the atmosphere. These pollutants react with sunlight to form ground-level ozone and other harmful compounds, creating the thick haze characteristic of photochemical smog.
What is the EGR valve on a 1991 Chevy Caprice Classic?
An EGR valve, is an emission control device/smog equipment. It allows burnt exhaust gas to enter the intake charge during light throttle operation, to help reduce the amount of (NOx) produced by the engine.
