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Old 05-11-2011, 04:08 PM   #1
Michel
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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??

Thanks,
Michel

oh the car is a 2002 330ci.
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Last edited by Michel; 05-11-2011 at 04:21 PM.
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Old 05-11-2011, 04:26 PM   #2
E36is
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stupid question, but did you change the oil, put high octane gas (94), and ran it on the hwy for an hour before you went for the e-test hot, not cold?
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Old 05-11-2011, 06:01 PM   #3
Michel
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^yup, oil change was done last week and my brother drove it hard before doing the test.. actually one reason for having a high NOx would be b/c of high temps, so I'm sure the car was hot enough..
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Old 05-11-2011, 07:37 PM   #4
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i would assume the cats and or o2 sensors are the problems. how old are the magna cats?
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Old 05-11-2011, 07:57 PM   #5
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cats are less than 1 year old, the o2 sensors are good, no codes. Post cat sensors are disabled from the Tune...
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Old 05-11-2011, 10:17 PM   #6
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This further proves my long lasting point that racing cats dont pass emissions.

Put your original manifolds back on, do e-test take them off and put whatever you had back on. No other way about it.

Thats exactly why I didnt install any racing cats on my car after headers install, wasted money that holds back the potential of your headers and doesnt even let you pass emissions.
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Old 05-12-2011, 02:08 AM   #7
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most aftermarket cats last about a yr... (emissions passing wise)

but he didnt fail on both things, so my suspicion is the problem lies elsewhere.
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