failed e check. NO to high
Thread Starter
TECH Apprentice
Joined: Feb 2009
Posts: 304
Likes: 0
From: Stow Ohio
failed e check. NO to high car failed e check had NO reading of 1059 legal limit is 796. two brand new cats. two new 02s. how do i fix this.
Posted from LS1Tech.com App for Android
Posted from LS1Tech.com App for Android
make sure you have the car warmed up before you go, I failed my check about a month ago because I just drove straight there. My NO levels were something around 750. I went again a week later having changed nothing, however I took a much longer route there, and my NO levels were something around 300
TECH Enthusiast
Joined: Jun 2002
Posts: 634
Likes: 0
From: In the garage fixing LT1
You need to test the EGR system to make sure it functions. http://shbox.com/1/4th_gen_EGR.html
This. A mechanic warned me that by removing my EGR valve the NOX might be too high with the sniffer. Check the valve and see if it's okay.
Thread Starter
TECH Apprentice
Joined: Feb 2009
Posts: 304
Likes: 0
From: Stow Ohio
Originally Posted by goldylocks
make sure you have the car warmed up before you go, I failed my check about a month ago because I just drove straight there. My NO levels were something around 750. I went again a week later having changed nothing, however I took a much longer route there, and my NO levels were something around 300
Posted from LS1Tech.com App for Android
On The Tree
Joined: Apr 2010
Posts: 162
Likes: 0
Not saying that this will work, but it has for two of my friends that swear by it when they had failed emissions testing in the past. They added a bottle of RXP to two tank fulls of fuel. That was all they did and both cars passed. I think one of them only did one tank, but none the less it may be an inexpensive and easy fix.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0
Brett Foote
10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever
Verdad Gallardo
You know, we've been fighting this battle with my sisters 94Z for months. We've replaced everything and it still hits too high on NOx. Last resort is to run the aforementioned guaranteed to pass in a bottle stuff. I have heard more than once that it works.
On The Tree
Joined: Apr 2010
Posts: 162
Likes: 0
It is a fuel additive that you can get at Pep Boys and other places. It may be snake oil and I am very cynical about these things, but this one has worked in two cases on others that are as cynical as I am.
It is about $8 per bottle. No guarantees it will work, but that is the first thing I would try if I was in your shoes. I am naturally lazy and things that work this easy are my crack.
It is about $8 per bottle. No guarantees it will work, but that is the first thing I would try if I was in your shoes. I am naturally lazy and things that work this easy are my crack.
