When does the EGR system cause high NOx?
The EGR system’s job is to re-route a small amount of exhaust gas back into the intake manifold to help reduce combustion chamber temperatures. As mentioned above NOx is created when combustion chamber temperatures reach above 2500F.
When do you get high NOx in your car?
Remember high NOx nitric oxide is created when an engine’s combustion chamber temperatures reach over 2500F. You will want to make sure your vehicle’s cooling system is working properly, and your vehicle’s temperature gauge is always indicating normal.
What causes high No ( Nox ) in the air?
What Causes High NO (NOx)? Nitrogen Oxide or NO is created when an engine’s combustion chamber temperature reaches over 2500F. Vehicle manufacturers have designed several systems, which when working properly, lower nitric oxide emissions.
What can I do to lower NOx in my car?
The solution to this problem is called De-Carbonizing. It usually costs around two labor hours at a smog check repair station. It will remove a good amount of carbon out of an engine. This will increase combustion space, lower compression and lower NOx.
Why does my Jeep 4.0L have high NOx?
While the columns did deal with a driveability problem on a Jeep 4.0L, the problem was entirely different from what your customer is experiencing. Second, a lack of backpressure caused by the aftermarket exhaust system should not cause an increase in NOX, at least not on a vehicle that’s capable of adjusting its own air/fuel ratio.
What kind of engine does a Jeep Wrangler have?
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. The engine has an aftermarket header and a Flowmaster exhaust system, which were installed by the previous owner. The tires also are larger than stock. It has no EGR valve and the timing is not adjustable.
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.
Why was my NOx too high on the smog test?
The only emission that was above the limit during the smog test was NO, however both HC and CO measurements were about halfway between “average” and maximum. A 2nd website said, “High NOX emissions are almost always due to a defective EGR valve (or some component that controls the operation of the EGR valve).
How to pass an emissions ( smog ) test?
6 Proven Methods for Passing an Emissions (Smog) Test: 1. Warm up Your Car’s Engine as Much as Possible Your car’s engine burns fuel, to make sure there is complete combustion (i.e., the engine is running as clean as possible) your engine needs to warm-up.
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.
The only emission that was above the limit during the smog test was NO, however both HC and CO measurements were about halfway between “average” and maximum. A 2nd website said, “High NOX emissions are almost always due to a defective EGR valve (or some component that controls the operation of the EGR valve).
The EGR system’s job is to re-route a small amount of exhaust gas back into the intake manifold to help reduce combustion chamber temperatures. As mentioned above NOx is created when combustion chamber temperatures reach above 2500F.
Do you need a catalytic converter in a non EGR vehicle?
Non-EGR equipped vehicles rely heavily on the Catalytic Converter to assist in the reduction of NO. These vehicles have tendencies to develop CAT problems sooner then those which are equipped. If you own a non-EGR equipped vehicle, and have failed the emissions test for high NOx, pay close attention to the Catalytic Converter.
What causes high No ( Nox ) in a car?
Nitrogen Oxide or NO is created when an engine’s combustion chamber temperature reaches over 2500F. Vehicle manufacturers have designed several systems, which when working properly, lower nitric oxide emissions. Below are common failures which may cause your car, truck, van, suv, or motorhome to produce high high nitric oxide. 1.
Why does a lean fuel mixture cause high NOx?
A lean fuel mixture exists when less fuel then required is delivered to the combustion chambers or when more air then necessary is added to the fuel. In either case the lack of gasoline needed to cool the combustion chambers down is not present. Combustion temperatures increase causing high nitric oxide emissions.