High nox is almost always caused by the cylinder
temperature being too high.   Look for something that
might cause that?  regards gary
Date:    Wed, 25 Aug 2004 10:46:23 -0700
From:    Craig Oda <craigoda@GMAIL.COM>
Subject: Re: Failed Emissions Check

I _think_ a lean-running engine will result in excess
NOX.   If it's
running too rich, I think you get excess HC.  Were the
HC readings
really low?  I'm a novice here, so keep that in mind.
Maybe the
timing is not set properly?  Is it set to 5 degrees
before TDC?
Sometimes these vans are setup to run 5 degrees ATDC,
which some
people say improves performance, but I think results
in higher
emissions.  (I'm kind of guessing here.)

You can also try putting a new cat on the exhaust and
running the van
on the freeway for 20 minutes prior to the emissions,
leaving it
idling to keep it hot until the last minute prior to
getting it
tested.

-- Craig

On Wed, 25 Aug 2004 11:11:01 -0400, Melvin
Mudgett-Price
<mprice@acmex.com> wrote:
> Took my van for its Ohio e-Check yesterday. The
engine has 20,000 on
a
> rebuilt Boston Bob. It passed with flying colors 2
years ago. This
time
> it failed on Nitrous Oxide emissions, they are
supposed to be around
> 900, mine were 1,900.
>
> I called my regular mechanic (VW specialist) and he
said there was
> nothing he could do, when van's start failing their
emissions test
> that's usually the end for them. This sounds like
total bs to me and
I
> don't know why he doesn't seem to want to even look
at the van.
Called
> another VW shop and they said no problem, bring it
in.
>
> Now to my question. What sort of things would cause
the "NO" to be
high.
> I would like have some idea not because the mechanic
will try
bamboozle
> me but because I don't like to be in the position
where he could.
>
> Thanks
> Melvin
> 83.5 Westy

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