ek-g6

i went to stat reff and failed everything was cool other than that my Nox emission were 3 times higher than allowed. i was allowed 837ppm and i failed by producing 3000+ppm! im not sure what it could be my cat converter? i put everything back to stock and still failed? I went to state reff with just some NGK Iridium IX spark plugs and a muffler that was the only thing modified! could that be the problem? if you know anything please help! its a 94 d16z6 motor BONE STOCK!!! HELP ME IM STUCK!!!

ddd4114

Post your entire emissions results (NOx, HC, CO%, CO2%, O2%) so we can help you better.

ek-g6

At 15mph %CO2 measured 13.9, %O2 measured 0.7, HC(ppm) max 130 measured 187
CO% max .80 measured .65, NOx(ppm) max 835 measured 3196

At 25mph %CO2 measured 14.7, %O2 measured 0.2, HC(ppm) max 105 measured 99
CO% max .69 measured .28, NOx(ppm) max 774 measured 2201

95sloweg

It might be a bad cat. i had the same problem a month ago.

nicks-eg6

i say just pay the dude to pass you..

ek-g6

i tried that, and he didnt take it i offered 2 bills and guess he couldnt be bribed? haha he's asian and i am too i thought he woulda taken it but nope! i guess its different from state reff and regular smog thanks for the advice tho.

ddd4114

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 95sloweg &raquo;</TD></TR><TR><TD CLASS="quote">It might be a bad cat.</TD></TR></TABLE>
Since all the numbers are elevated (especially NOx), this is very possible.

How's your timing? Have you tried Seafoam and/or injector cleaner?

ek-g6

yeah i was going to use that because my hc were somewhat high, i think the timing maybe advanced because the distributor is has been moved and the bolt is not in the middle it is on the right side of the bolt hole could that be it?

ddd4114

Check it. Advancing your ignition timing will increase your NOx count.