NOx emissions though, are generally a result of high combustion temperatures. The EGR valve (or a cam timing equivalent) is typically what helps reduce the NOx emissions.
You might post up a copy of the report itself as well. Sometimes, other emissions leves can be higher than it should but still within passing range. Short of multiple smog device failures, seeing the broader range of emissions might help to more easily diagnose the source of the problem.
Post Title: FN-QR
Posted by: PEZi720 at 2:09 PM 5/1/2009
all i know is my NOx gases fail by over 500%!!!!
good thing i don't have to get tested!
Post Title: Re: FN-QR (PEZi720)
Posted by: dulobast25 at 10:43 PM 6/30/2009
the bpt is located right above the egr and looks like a disk with 2 hoses on top
the b esure the hardline from the egr to the exhs manifold isnt clogged or leaking.
between each check the nox should be going down if faulty. we chased down a noix probl;em on a hb for 2 yrs after switching the bpt valve 3 times.
a mod of the bpt valve took nox from 1300 to under 700 in i hr.
cats have an effect but try testing b4 replacing.
remeber as nox goes down, co2 often goes up.. its a balance
Post Title: FN-QR
Posted by: PEZi720 at 10:58 PM 6/30/2009
< Contact Us - NICO
>
Visit G37Driver.com for Infiniti G37 Information
NICOclub's Nissan forums and Infiniti forums and all affiliated sites are the property of HDS Holdings, Inc.
They are independent publications and are not affiliated with or endorsed by Nissan Motor Company or Nissan North America.
Information © Copyright © 2000-2009 by NICOclub
All rights reserved. Material may not be copied or reprinted without written permission.
Visit 370zclub.org for Nissan 370z Information