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High NOx reading... any suggestions?

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    #1

    High NOx reading... any suggestions?

    I just took my accord to get it's smog check and seemed to pass in all but one area.

    Here are the reading:

    @ 15mph, RPM 1803
    %CO2 - 14.8
    %O2 - 0.1

    HC (MAX/AVE/MEAS)
    61/28/25

    CO (MAX/AVE/MEAS)
    0.51/0.10/0.01

    NO (MAX/AVE/MEAS)
    490/230/476


    @ 25mph, RPM 2465
    %CO2 - 14.7
    %O2 - 0.2

    HC (MAX/AVE/MEAS)
    36/17/17

    CO (MAX/AVE/MEAS)
    0.49/0.08/0.00

    NO (MAX/AVE/MEAS)
    730/203/1197

    I just removed my EGR and cleaned the opening into the engine with CARB cleaner, along with the opening on the EGR itself. I wasn't sure if that was the "passageway" that I've read about. I tried to compare the cleaning method to one I watched on youtube http://www.youtube.com/watch?v=d8N-SE047VY, but it wasn't the same setup on mine. I have a 93 accord SE. Not sure what year he was working on. I also replaced the O2 sensor with a DENSO O2 sensor a few months ago when my CEL popped on.

    Hopefully someone has a solution or a suggestion that can help me. Thanks!
    Tags: None
    #2
    You can probably retard the timing -2 below spec but it wont help to much and will raise your hc a little

    Usually nox numbers go down with speed and you have the oppisite. But I would of cleaned the egr ports on the manifold itself. If possible get some hard wire and run it through the channels from the egr solinoid through where the egr ports are.

    http://home.comcast.net/~em-engineering/T2T013.pdf

    What puzzles me is that you are still showing o2. Usually that should be used up if not .1 should be zero. Do you have an exhaust leak?
    Last edited by accordztech; 03-15-2011, 02:59 AM.
    What makes me laugh about forums, is that no matter how much you try to help someone, they dont take the advice. Go ahead and do it the hard way.

    You got to respect what you drive, and appreciate what you have, making the best of what you got. and if that means putting CAI, HID's, a phat stereo system, and a idiot in the drivers seat...then so be it!

    Retro!

    Hater

    I love nooBs...They make me look good

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