emission help

[Importroller]

I went to take my emission test today since my test pipe/resonator came in today, and I want to install it. so i figured I would get the e-check before i replace the cat. but, I failed the NOx test.

their limit is 910.0 and I read 1685.6

according to the info in the pamphlet, they say that could be caused by too high a combustion temp. would adjusting my timing be enough to change this so I pass, or should I try something else?

[supra brit]

I failed my NOx as well...our limit is 1300 somethin, and I had 3200ish...he told me it was a bad EGR valve or cat...

[navysnail]

wow... 3200, the egr is probobly not functioning or eliminated, timing wouldnt make that much of a difference

[Importroller]

i cleared my EGR, but when I put my header on, I did notice the cat looked pretty damn clogged. So im gonna replace that next

[Zydeco]

more then likey its the cat. if you got more then 100k on your cat it should be replaced.

[Importroller]

111K on it. only thing on my exhaust that hasnt been replaced or upgraded

[Nismo_Freak]

I went to take my emission test today since my test pipe/resonator came in today, and I want to install it. so i figured I would get the e-check before i replace the cat. but, I failed the NOx test.

their limit is 910.0 and I read 1685.6

according to the info in the pamphlet, they say that could be caused by too high a combustion temp. would adjusting my timing be enough to change this so I pass, or should I try something else?

Check EGR for operation / leaks.

Also check for vacuum leaks in and around the actuator.

Increase fuel enrichment and reduce the timing about 1 - 2 degs.

[Mr1der]

I was about to ask how you change the timing then was like "oh right....they have distributors...whoops..."