What causes NOx formation in a Jeep Cherokee?
Last of all, an engine that’s running hotter than normal will encourage NOX formation. A faulty thermostat or a clogged cooling system could be keeping the Jeep’s operating temperature just shy of overheating. Adding a load pushes the combustion chamber temperature to the point where NOX formation increases to an unhealthy level.
What makes a Jeep Wrangler fail a smog test?
NOx was the last addition to the list of monitored exhaust gases. Misconceptions regarding the conditions that promote its formation still exist. I am working on a 1995 Jeep Wrangler with a 4.0L engine that has failed to pass a smog test due to high NOX.
What are the NOx levels in my car?
I also installed a NOX-reducing cat. After these changes, it barely passed the 15-mph emissions test and still failed the 25-mph test for NOX. The exhaust readings at cruise are as follows: CO, .01%; HC, 12 ppm; CO2, 15.0%; NOX, 917 ppm.
How does an EGR valve lower NOx levels?
Many emissions systems rely on an EGR valve to lower combustion chamber temperatures. Adding a small amount of inert exhaust gas when the engine is under load lowers the temperature in the combustion chambers just enough to reduce the formation of NOX.
Last of all, an engine that’s running hotter than normal will encourage NOX formation. A faulty thermostat or a clogged cooling system could be keeping the Jeep’s operating temperature just shy of overheating. Adding a load pushes the combustion chamber temperature to the point where NOX formation increases to an unhealthy level.
NOx was the last addition to the list of monitored exhaust gases. Misconceptions regarding the conditions that promote its formation still exist. I am working on a 1995 Jeep Wrangler with a 4.0L engine that has failed to pass a smog test due to high NOX.
What to do if your car fails the NOx test?
If you own a non-EGR equipped vehicle, and have failed the emissions test for high NOx, pay close attention to the Catalytic Converter. Read about Catalytic Converter
Many emissions systems rely on an EGR valve to lower combustion chamber temperatures. Adding a small amount of inert exhaust gas when the engine is under load lowers the temperature in the combustion chambers just enough to reduce the formation of NOX.