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1994 Honda Civic Question: How can I lower my High Speed Nox (ppm)?

 

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Jwb014, 1.5L 4 Cylinder, Deer Park, TX, November 06, 2012, 11:24
 Rookie

I failed the inspection for my nox (ppm) on my High Speed Emissions test. The standard is 1240 and my result was 1267.

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  • Answer #1

    Greg's Orange Auto (14224 Answers) , Orange, CA - (714) 361-9386
    globalhelper November 06, 2012, 12:44
     Master

    ck egr passages for blockage of carbon or timing can be retarded or poss o2 sensor

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  • Answer #2

    November 06, 2012, 19:24
     Master

    Globalhelpers suggestion first!! EGR SYSTEM function is very important. Next would be timing as he mentioned , and then be sure the cooling system is in good shape. Last , if high miles (by age I'm assuming it is) maybe a top engine cleaner -get carbon build-up off pistons -lower comp. lower combustion temp=lower Nox.

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    globalhelper, November 06, 2012, 19:35
     Master

    well said zip man

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    ziptie12, November 06, 2012, 21:05
     Master

    Thank you.......:) ......never mind.

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  • Medium-star Best Answer
    November 06, 2012, 20:20
    Profile_thumbnail
     Master

    Check EGR, and Carbon build-up

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