Date: Wed, 10 Feb 1999 14:04:35 -0700
Reply-To: Gary Shea <shea@GTSDESIGN.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Gary Shea <shea@GTSDESIGN.COM>
Subject: Re: Thoughts on unsmoggable 81 Westy
In-Reply-To: <Pine.SUN.3.96.990210132017.17539f-100000@nomad.nts.gssc.com>
Content-Type: TEXT/PLAIN; charset=US-ASCII
Hi Jack --
I've been noting your emails, about this time each year, for the last
maybe 4 years. Getting these things through emissions testing is hell!
I was having similar problems, then three years ago rebuilt the engine
and haven't had too much trouble since. About the only question I have
is wrt your air flow sensor (that's the AFC, right? acronyms....)
The afc has a spring under the plastic cover which determines how much
the afc reacts to a given amount of airflow. Since it's a very long
spring (like a watch spring) I would presume the response is pretty
linear. I am not sure if high altitude is grounds for changing the
AFC, but I have had fairly good experiences with doing so. It's
definitely possible to lean out the mixture, the only question is how
to avoid leaning it out too much and running the engine too hot.
Well, that's the only question I'm aware of anyway...
My recollection is that turning the toothed wheel in the counter-
clockwise direction had the desired effect on my '81. I was very
careful to mark the original location of the toothed wheel so that
I could undo any changes I made... I think I have it set maybe six
or eight notches from the original point. I would be curious if
other folks have experimented with this setting... I haven't tried
fooling with large changes, although it's surely be fun to see what
happened! Note that you're about 1000' higher than I am here in SLC.
Gary
On Wed, 10 Feb 1999, Jack Reed wrote:
> Howdy all,
>
> It's time for my annual hunt for the elusive emissions sticker. I've had
> to get a waiver more years than not, and this year I'd like to cure what
> ails the beast once and for all.
>
> What's been done:
> New AFC
> Compression check (110-120 lbs across the board)
> Filters changed before each test (oil and air)
> New Plugs
> All resistance/voltage values in spec at the ECU connector
> All joints and rubber checked for possible air leaks
>
> What's not been done:
> Haven't changed the wires
>
> My thinking at this point is to change the head temp sensor, since I
> believe the output of the sensor to be low. If low then the ECU would
> create a lean burn state, which is just as hard to solve as over rich.
> This van does NOT have an O2 sensor.
>
> Any thoughts on changing the sensor as a final fix, or other's
> experiences with similar problems that resulted in a sticker gladly
> sought.
>
> Thanks,
> Jack
>
> Jack Reed Longmont Colorado 800.447.2861
> Grumman Systems Support Corporation
> Information and Service Providers for the Workstation Community
> jack@nts.gssc.com
>
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Gary Shea shea@xmission.com
Salt Lake City http://www.xmission.com/~shea
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