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Fail smog high nox

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Old 06-24-2012, 10:57 AM
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Fail smog high nox

I have a 99 prelude type sh with 192xxx miles. It runs really good. I fail the nox emissions twice. I took it the first time and fail nox on the 15mph but did ok on the 25mph. I fail by 60 points. The guy told me it maybe the EGR not kicking in so I cleaned the EGR valve and checked if it was kicking in and it was so I thought that was it so I went back again and it fail with even more nox. All other emissions passed really good. Idk what else is left. If I need to post the results let me know. Just before I took it the first time I had changed the oil, spark plugs, coolant, and air filter. Is there any solution I can pour into the gas tank to pass? Any tricks or what's wrong?
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Old 06-24-2012, 12:12 PM
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Re: Fail smog high nox

Idk if it'll work but have you ever sea foamed your car???
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