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1,188 Posts
Discussion Starter #1
I just got back from the smog station and I passed because of high NO levels. My truck measured a 540 and the max is 533. It passed everything else.

Any suggestions to help get this fixed?

1995 s10 2.2 manual tranny

The cat is relativly new and the truck seems to be running well.

EGR Valve maybe?
 

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SlammedSonoma96
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904 Posts
well, you can replace the egr, but that will only help a little, the cat is usually the problem when you fail on Nox. A easy fix, would be to get some top engine cleaner, and slowly pour into the intake while running it. Then you pour the rest of it fast until the engine dies. Let sit overnight. When you start it back up, it will spit all the carbon buildup out the tailpipe. This is a simple and quick fix to Smog checks, and usually is a guaranteed pass. I used to live in California, and the smog checks always killed me, and this is when I learned this trick.
 
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