Question about 1993 Mazda MX-3

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My car failed emissions oxides of nitrogen was a 5.74

My car didnt pass because of oxides of nitrogen (nox) in grams/mile it was at a 5.74 can u please help

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Catalytic converter problem? Usually it takes most of the harmful impurities out before leaving your exaust system. $

Posted on May 21, 2009

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1 Answer

What does emmissions no ppm mean


Google what ever your Emission Report has on it

CO or NOX

ppm ---parts per million
NOX--Oxides of Nitrogen

Feb 17, 2013 | 1991 Chevrolet Cavalier

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Failing emissions testing due to high NOX (oxides of nitrogen)


I have seen several people posting emissions failures due to high NOX (oxides of nitrogen). Nox is created when the engine's internal combustion temperature gets to high.

Two reasons this can occur is improper coolant levels and a malfunctioning egr system. The egr system injects exhaust gas from the exhaust and uses it to line the cylinder walls.This in turn reduces the combustion chamber size and internal combustion temperatures. Ultimately this reduces the amount of NOX created. These systems functioning properly can be the difference in passing or failing your emissions testing because of high NOX ppm.

on Jun 18, 2010 | Chevrolet 1500 Cars & Trucks

1 Answer

Not passing emissions


The NOx (Oxide of Nitrogen) level standard in the state of New Jersey is 1372. Anything higher than this number will fail emissions.
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vas 5054a v19

Dec 19, 2012 | 2008 Chevrolet Suburban

1 Answer

Sometimes hard to start, then when driving the car will lurch and wants to die


its your catalytic converter (colloquially, "cat" or "catcon") is a vehicle emissions control device which converts toxic byproducts of combustion in the exhaust of an internal combustion engine to less toxic substances by way of catalysed chemical reactions. The specific reactions vary with the type of catalyst installed. Most present-day vehicles that run on gasoline are fitted with a "three way" converter, so named because it converts the three main pollutants in automobile exhaust: an oxidizing reaction converts carbon monoxide (CO) and unburned hydrocarbons (HC) to CO2 and water vapour, and a reduction reaction converts oxides of nitrogen (NOx) to produce CO2, nitrogen (N2), and water (H2O).[1] The first widespread introduction of catalytic converters was in the United States market, where 1975 model year gasoline-powered automobiles were so equipped to comply with tightening U.S. Environmental Protection Agency regulations on automobile exhaust emissions.[2][3][4][5] These were "two-way" converters which combined carbon monoxide (CO) and unburned hydrocarbons (HC) to produce carbon dioxide (CO2) and water (H2O). Two-way catalytic converters of this type are now considered obsolete, having been supplanted except on lean burn engines[citation needed] by "three-way" converters which also reduce oxides of nitrogen (NOx).[2]
Catalytic converters are still most commonly used in exhaust systems in automobiles, but are also used on generator sets, forklifts, mining equipment, trucks, buses, locomotives, motorcycles, airplanes and other engine-fitted devices. They are also used on some wood stoves to control emissions.[6] This is usually in response to government regulation, either through direct environmental regulation or through health and safety regulations.
Catalytic oxidization is also used, but for the purpose of safe, flameless generation of heat rather than destruction of pollutants, in catalytic heaters.

Oct 15, 2012 | 1995 Buick LeSabre

1 Answer

My 1995 Nissan pick up truck failed the emission test from NOx oxides of nitrogen. The standard is 3.00 mine was 3.26, what could be the problem, is it the EGR valve?


NOX is formed from high pressure and temperature above 2500 degrees. The job of the egr is to recirculate exaust back into the cylinder to give it a cooler charge (exhaust wont burn). Make sure your cooling system is up to par and clean your egr with some carb cleaner and make sure the passages are clear. egr valves and passages get very dirty

Sep 08, 2011 | Nissan Pickup Cars & Trucks

1 Answer

I HAVE A 99 ALERO OLDS.4CYL.& IT WON'T PASS SMOG


IF DECELERATION FUEL REDUCTION SYSTEM IS NOT OPERATING, FUEL ECONOMY WILL BE REDUCED WHILE HC AND CO EMISSIONS ARE INCREASD.SEE ON MANY ENGINES WITH DECELERATION FUEL REDUCTION SYSTEMS THE PCM STOPS GROUNDING THE INJECTORS IN A SPECIFIC RPM, DURING DECELERATION.

Jun 23, 2011 | 1999 Oldsmobile Alero

1 Answer

What is the meaning of a failing test with NOx(ppm)


Oxides Of Nitrogen (NOX)

Above 2500 degree engine combustion temperature
nitrogen bonds to oxygen to form NOX

The EGR Valve is supposed to allow a certain
amount of exhaust gases into incoming air to
control high combustion temperature and control
NOX

Bad Egr Valve
Engine operating too hot
Cat too cool at inspection station
Fuel mixture issues
PCV issues
O2 Sensor issues
Injector issues
Ignition issues

Jan 30, 2011 | Toyota Previa Cars & Trucks

2 Answers

Taurus SHO wont pass emissions: 95 Taurus SHO 3.2L Failed emissions badly- hydrocarbons in grams/mile=1.68 where .80 is pass carbon monoxide in grams/mile=44.80 where 12.00 pass. oxides of nitrogen in...


If the fuel regulator is seeping gas, replace it first. There is a good chance the diaphragm has a hole in it and is feeding fuel through the vacuum line directly to the intake, causing extremely rich fuel mixture. (Hence the strong exhaust and burning eyes) As a matter of fact, if you pull the vac line off and turn on the key, I bet fuel sprays out. Be careful not to start a fire on a hot engine. Once you get this repaired, erase the codes and retest. You could find yourself with only one code, maybe even none. I wish you luck. Emissions can make you pull your hair out.

Sep 16, 2009 | 1995 Ford Taurus

1 Answer

89 Firebird won't pass emissions


Try replacing the o2 censor i had that problem with my truck last year and i replaced that part and it passed with flying colors

Mar 24, 2009 | 1989 Pontiac Firebird

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