[Volvo-brickster]

So I failed.

Driving test NOX 2.18 gm/km.

max is 1.6 or something.

Did some googling and hi NOX is a result of high combustion temperatures.

Bad EGR valve a common cause.

My problem is my cooling fan clutch is dead ( only spins on low ) and during testing my water temp was touching 210 degrees Fahrenheit ( normally when on the highway its 180 ). I have an electric fan that was running but I guess it wasn't enough. Their rack mounted cooling fan probably wasn't pushing enough air either.

Could high engine temp be a cause of high NOX levels as well ?

[Impreza]

Yes. High coolant temp can cause NOx. Timing can affect running temp too.
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[stewie]

just go to lordco and buy one of those "guranteed to pass or double your money back" things, just pour it in your gas tank, drive the car till its empty, fill er up again and go for the aircare. I use them every time and ive yet to fail aircare.

[Impreza]

Some of those stuff might actually bring up NOx. Read them carefully.
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