Another failed e-test
So I just failed an e-test. My NOx value is about 100pts higher than the maximum. Possible related mods are the following; schrick cams, headers, AA-tune and magnaflow cats.
I know that high NOx values can be due to EGR, running lean, or cats.... I'm thinking that its from the cats, but I'm also not sure if the car is running lean b/c of the tune. It does produce a good amount of soot and backfire, so I'm assuming its not running lean. What do you guys think??
oh the car is a 2002 330ci.
Last edited by Michel; 05-11-2011 at 04:21 PM.