Nox
Thread Starter
6th Gear
Joined: Jun 2000
Posts: 6
Likes: 0
From: Mesa, Az. USA
Nox
Howdy all
I'm having problems getting past emissions testing. The HC is in the middle of the range, the CO is in the middle of the range and the NOX is .02 above max. Any suggestions as to the cause would be greatly appreciated.
Thank You
Jim
I'm having problems getting past emissions testing. The HC is in the middle of the range, the CO is in the middle of the range and the NOX is .02 above max. Any suggestions as to the cause would be greatly appreciated.
Thank You
Jim
Melting Slicks
Joined: Dec 2004
Posts: 2,161
Likes: 0
From: pr, frederick md.
i cant say how to get rid of it by itself, but there are several tricks to help pass the test. do a complete tune up, turn timing back, tune your carb a little lean, and make sure its up to temp so the ehaust will help burn off the bad stuff. i seem to remember reading that the emmision junk you pour in your tank actually works. dont know. you didnt mention if youve got catalytic converter or not, its gotta be in good shape and at running temps to work. if all else fails, offer the dude a 6 pack 
Melting Slicks
Joined: Jun 2001
Posts: 2,340
Likes: 2
From: Moro IL
NOX is a byproduct of high cumbustion tempratures. If your car is a year that has EGR (you didn't specify what year of car) then it may not be functioning properly. IF your EGR is functioning poperly or never had EGR, then things such as too advanced ignition timing or carbon deposits in the cumbustion chambers can raise NOX production. Just a few ideas to start with, hope I helped.
Pat Kunz
Pat Kunz
Race Director
Joined: Nov 1999
Posts: 10,643
Likes: 8
From: Foxfield CO 1970 Convertible
Sounds like it might be ignition timing and / or EGR controls.
How many $10 bills were in your hand when you gave the emissions tech the car keys??
http://www.aircarecolorado.com/repai...NOx%20Standard
How many $10 bills were in your hand when you gave the emissions tech the car keys??
http://www.aircarecolorado.com/repai...NOx%20Standard
