Question about Chevrolet Suburban
High nox emission
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
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
What is the make ,model and year please
Posted on Nov 29, 2012
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Posted on Jan 02, 2017
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
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
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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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.
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