Date:         Wed, 9 Apr 2008 10:40:51 -0500
Reply-To:     Ben Cichowski <aquasheck@HOTMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Ben Cichowski <aquasheck@HOTMAIL.COM>
Subject:      Re: flow-through muffler -> cool cat -> failes emissions
Comments: To: Aaron Pearson <aarondpearson@hotmail.com>
In-Reply-To:  <BLU117-W46A871476265610C0A17E3ACED0@phx.gbl>
Content-Type: text/plain; charset="Windows-1252"

Aaron,

couple of things:

1. Yes, if the CAT is too cool, it will not properly reduce your CO emissions. How far is your CAT from the engine - is there some sort of funky routing, etc? - probably not...so maybe it could be your high-flow muffler. Hopefully the stock muffler will fix your problem.

2. Are you sure you are running right? What are your NOx readings looking like - are they excessively low? What I'm getting at is that if you are not getting enough oxygen into your mix (i.e. running rich) you will not be removing CO, but will likely be removing a lot of NOx. I'm not totally sure, but this could possibly be something simple like a clogged air intake.

-Ben

> Date: Wed, 9 Apr 2008 10:15:54 -0500
> From: aarondpearson@HOTMAIL.COM
> Subject: flow-through muffler -> cool cat -> failes emissions
> To: vanagon@GERRY.VANAGON.COM
> 
> my EJ22 van has failed emissions (CO too high) several times in a row.  after confiming that the van is in tune and running right (new O2 sensor, valve position sensor, temp sensor and new plugs), and adding a test take-out before the cat, my mechanic believes that the problem might be that my fancy flow-through magnaflow muffler may be cooling the cat down too quickly so that it is not doing it's job removing CO.  that is, when running on the highway the cat is hot and clean, but after waiting in line at the emission test facility, the cat cools down and doesn't clean out the CO.  this makes some sense to me, but i'm not a chemist.  he's trying that now, putting on a known good stock muffler and running it through thte test.  what's your vote: will i have my van back tonight with a clean stamp from aircare colorado?
> 
> aaron
> '87 syncro westy ej22
> boulder, co
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