[dart64]

I just failed my emmissions test. They said my Nox was too high. I don't know what that means, but does anyone know what I should do?

The guy told me it may be my catylic converter, but I read on a post somewhere that if your converter was bad, it would smell like rotten eggs. My car doesn't smell.

Also, I read that the EGR valve could be the problem. I do have that surge hesitation thing under 3000 rpm, so maybe that could be it? I know you can clean it, but I'm so clueless when it comes to working on cars.

The car passed emissions in New Jersey, I don't understand why it wouldn't pass in California.

Any advice would be great.
Thanks...

 

[91SE-R]

what do you mean in California? arn't you in Boston? and the smog in Cali depends on where you live....

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fast but not fast enough!

 

[Guest]

Just go the stealership and get your idle and throttle possition sensor (TPS) adjusted.$35 Mine had the same problem last year and the TPS was out. I also had the surge/hesitation, mainly at stop signs when still cold.--Keep all reciepts---sometimes they'll let you pass when you spend a certain amount of money trying to fix it.

 

[slowSER]

<font face="Verdana, Arial" size="2">Originally posted by dart64:
I just failed my emmissions test. They said my Nox was too high. I don't know what that means, but does anyone know what I should do?

The guy told me it may be my catylic converter, but I read on a post somewhere that if your converter was bad, it would smell like rotten eggs. My car doesn't smell.

Also, I read that the EGR valve could be the problem. I do have that surge hesitation thing under 3000 rpm, so maybe that could be it? I know you can clean it, but I'm so clueless when it comes to working on cars.

The car passed emissions in New Jersey, I don't understand why it wouldn't pass in California.

Any advice would be great.
Thanks...

</font>

My cat was bad when I did an emissions test a couple years ago. I had the high Nox level, too. The car appeared to run fine and didn't have a "rotten egg" smell. However, when they replaced the cat, I took a look at the old cat, and a huge chunk of the honeycomb inside had broken loose.

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'93 Sentra SE-R, daily driver and track/autox toy
'91 Sentra SE-R, future racecar

 

[sr20boston]

I could find you a place that can look the other way, unless you think it's part of a larger problem...

 

[spnx]

High NOx is a function of efficient combustion, so you could make your car less efficient by retarding the timing, ahem, temporarily for the test.

Or you could just clean and check your EGR, which has the biggest effect on emissions of any of your pollution controls.