Date: Tue, 26 Oct 2004 18:20:39 -0400
Reply-To: Dennis Haynes <dhaynes@OPTONLINE.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <dhaynes@OPTONLINE.NET>
Subject: Re: Calif Smog Issues
In-Reply-To: <001f01c4bb63$d7821740$1302a8c0@athlonxp2600>
Content-type: text/plain; charset=us-ascii
The VW tune up spec of 1%, +/- .5 is to be taken before the catalyst. If
all is really running as it should, the HC and CO should be close to 0.
Also, note that with this 82 being non California, it does not have the
benefit of the O2 sensor or the 3-way cat. Also, all after market cats
have less material than the OEM. Both diameter and length is usually
less. Their effectiveness and life is not that good.
Dennis
-----Original Message-----
From: Tom Young [mailto:tomyoung1@comcast.net]
Sent: Tuesday, October 26, 2004 9:58 AM
To: Dennis Haynes; vanagon@GERRY.VANAGON.COM
Subject: Re: Re: Calif Smog Issues
From: "Dennis Haynes" <dhaynes@OPTONLINE.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Tuesday, October 26, 2004 3:26 AM
Subject: Re: Calif Smog Issues
> Ideally, the CO should be well under 1.0%.
Well, the "standard" for the Smog II test is .94 and .74 so I guess I
can't
dispute that. But, since the "spec" for the Federal Vanagon is 1% +/-
.5%
essentially California has set these vehicles up to fail even if *every
part* of the engine is to original spec.
> Excessive CO is due to insufficient O2.
Typically expressed as the fuel air mixture is "too rich."
> The mixture adjustment is not going to have any effect
> at speed, something is wrong.
If you're talking about the basic air/fuel mixture adjustment procedure
contained in Bentley, then the mixture adjustment of course *does* have
effect at speed. My numbers at speed improved considerably after I went
in
and tightened the spring and then took the vehicle to the VW dealer to
have
the mixture set. The question I asked, the one I'm trying to get
answered
is: since the smog test is "at speed" but you set the basic mixture "at
idle" how the hell do you ever know if you're going to pass "at speed"
without going back and forth between adjusting the mixture and then
taking
the test, maybe several times?
> Check the ignition timing, make sure it is
> not over advanced and that the advance mechanisms are working
properly.
They're fine.
> Is the EGR valve intact and working? This will help.
It's there and working. Since the EGR is there for NOx I don't think
this
is relevant.
> Check the injectors
> for spray pattern-balance. Last resort is to adjust the spring tension
> in the air flow meter.
I've already done that. At this point I don't know, and can't know
without
a dyno, whether I have enough adjustment left with the mixture screw to
get
the engine lean enough or if I have to go in and tighten the spring
again.
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Tom Young
Lafayette, CA 94549
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