Question about Chevrolet Suburban

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Fail emission high nox

High nox emission

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2 Answers

EGR Valve is supposed to be there to keep
NOX at acceptable levels

So check that it is working correctly

Rules for going to inspection

New Spark Plugs
New Air Filter
Change Oil --use Full Syn at least for inspection time
EGR has to work
No 100,000 miles on Oxygen Sensors--replace front ones
closest to engine--- if over 100 thou
Exhaust Converter--replace at 14 years of age,maybe 12 years old
Clean MAF Sensor

Got it

For-- NOX---Pick a nice cool & even rainy day--- when the
air temp is down & moisture or water grains in the air are up

Posted on Nov 29, 2012

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  • Chevrolet Master
  • 2,101 Answers

What is the make ,model and year please

Posted on Nov 29, 2012

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6 Suggested Answers

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Posted on Jan 02, 2017

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SOURCE: Our 1991 Toyota Corolla failed

yes the cadallac converter produces nox emissions i would say the cadallac is on its way out

the caddalac is on the exuast

Posted on Jul 29, 2008

justuscc
  • 360 Answers

SOURCE: CHEVY SUBURBAN FAILED SMOG BECAUSE OF HIGH NOX VALUES.

nox is from running lean..... its realy high temps that cause this.......... replace the o2 sensors this should cure that any more help let me know

Posted on Oct 24, 2008

  • 1 Answer

SOURCE: 2002 Hyundai Sonata wont pass smog

CA you can take the car to a referree and get a one time waiver if you have spent a minimum of $450 on repairs not including smog fees. Gives you two years to get it fixed. Smog Referee Call Center
Toll Free: 1.800.622.7733
You can also sell the car to the state for "up to" $1,000

Posted on Feb 01, 2009

  • 15 Answers

SOURCE: Emissions failing with high NOx

You need to check the oxygen sensor. You car may be running lean and therefore giving you increased NOx levels

Posted on May 30, 2009

nvannoy
  • 234 Answers

SOURCE: 1992 dodge stealth failed smog test with high NOx

NOX is produced when cylinder temperatures exceed 2500 f.
Your vehicle has 2 ways to directly reduce NOX, EGR system, and catalytic converter, and also the cooling system indirectly.
Take a look at the EGR system, vacuum lines, pipes, and make sure the diaphragm moves. Disconnect the vacuum line, then push on the diaphragm and plug the hole (from vacuum line) when you release the diaphragm there should be vacuum. Also you may want to take it out and give the EGR passages and EGR valve a good cleaning, with some type of carbon cleaner like carb cleaner.

Posted on Mar 10, 2010

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2 Answers

I just failed emissions on for nox are there any easy fixes for this


There are a lot of things that cause high NOX, One of them is a vacuum leak that can cause the engine to run lean. Lean engine conditions can cause high heat and that causes NOX to increase. Some things you need to look at:
EGR valve operation.
Thermostat temp on the engine
Spark plug temp
Cat converter

Jan 22, 2018 | Nissan Altima Cars & Trucks

Tip

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

Fail smog test


fist i would like you to post the year make and model of the truck along with the HC ppms and NOX ppm it would be very helpful but high hc and nox can be attributed to a faulty EGR system nox is produced when the combustion chamber temperature gets too high so a small amount of exhaust is cycled back into the air stream to help cool them there are other causes but without looking at the levels its much harder to say

Dec 06, 2012 | Cars & Trucks

1 Answer

I have a 95 grand jeep cherokee and i have failed 2 emission they say it is a the NOx is to high what would cause that?


What causes High NOX Emissions


Thousands of technicians have faced the challenge of bringing a particularly stubborn application into compliance for NOx emissions. High NOx readings are a clear sign of performance issues somewhere in the system. The question is, where?
Among the potential causes of non-compliant NOx readings are:
Misfire condition
Malfunctioning or improperly adjusted EGR valve
Failed oxygen sensor
Leak in exhaust tubing upstream of converter
Excessive carbon deposits in combustion chamber
Improper spark advance
Blocked coolant passage
Overly lean air-fuel mixture
Damaged cold air duct
Failed or malfunctioning catalytic converter
Corroded or damaged engine sensor electrical connections

Please note that while a failed catalytic converter will contribute to high NOx readings, the failure in itself may have been caused by some other upstream performance problem. In all cases, it is crucial to identify the root cause of the problem before blaming the converter.

Case Study

Oct 09, 2012 | Jeep Cars & Trucks

1 Answer

1999 Saturn failed emission test due to high NOx. Mileage is 103,000 km. 1.9 litre sohc


high NOx is an indication of a bad egr system or the catalytic convertor

Nov 19, 2010 | Saturn SC2 Cars & Trucks

1 Answer

Failed emissions....high nox


Sticking egr will raise everything except nox. Bad o2 bad cat hard to give an accurate diagnosis with out checking it

Oct 12, 2009 | 1994 Lexus LS 400

2 Answers

Emissions failing with high NOx


Change the lambda/oxygen sensor in the exhaust.

May 21, 2009 | 1994 Mitsubishi Galant

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