my main adjustment was made in my airflow meter. THIS was effecting a good pass.

Joe

-----Original Message-----
From: jimt <wetwesty@TACTICAL-BUS.INFO>
Sent: Oct 25, 2004 8:46 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Calif Smog Issues

Running to lean can give high CO.  from your readings it looks like you are
actually running lean.

On 10/25/04 9:20 PM, "Tom Young" <tomyoung1@COMCAST.NET> wrote:

> From: "Dennis Haynes" <dhaynes@optonline.net>
> To: "'Tom Young'" <tomyoung1@COMCAST.NET>; <vanagon@GERRY.VANAGON.COM>
> Sent: Monday, October 25, 2004 7:38 PM
> Subject: RE: Calif Smog Issues
> 
> 
>> It would be helpful to give us the test readings and the requirements.
>> The major difference in the Federal and CA versions for that year is the
>> CA gets a larger catalyst, 3-way, located on the side instead of the
>> rear and closed loop operation with the O2 sensor. The O2 sensor is
>> required with the 3-way cat to reduce NOx emissions, a leading
>> contributor to smog. In order to test the effectiveness of the cat, EGR,
>> etc, at reducing NOx, the engine must be placed under load. That is why
>> the dyno test is required.
> 
> The dyno test was implemented by California to get older cars off the road.
> The stress placed on the engine *does* give a truer picture of pollution
> emissions while driving.
> 
>                               HC               CO                NO
>                         Max  Meas    Max  Meas    Max  Meas
> M1:  15 MPH     130     78     0.94  1.83      1106  446
> M2:  25 MPH     103     72     0.74  1.80        936  282
> 
> The catalytic converter is a 1.9l water-cooled cat that I installed because
> it had the O2 sensor port built-in.  When I was getting funky readings from
> that setup I went ahead and installed the O2 bung further upstream.
> 
>> 
>> To say you "think" your engine is sound implies, not sure. Compression
>> and leak down test is in order. These engines are notorious for burned
>> valves, dropped seats, and burned out head gaskets or loose heads.
>> 
> 
> I've only got about 3,000 miles on the engine since I rebuilt it.  It runs
> very strong, so my seat-of-the pants response is that the engine is sound.
> 
>> The basic setting for the mixture is only effective near idle speed.
>> After that, anything wrong with the mixture requires diagnosis and
>> repair. Look for leaking injectors and vacuum leaks. Provide some
>> numbers and we can be more helpful.
> 
> ---------------------------------------------------
> Tom Young
> Lafayette, CA 94549
> ---------------------------------------------------
> 
> 
>> 
>> Dennis
>> 
>> 
>> -----Original Message-----
>> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
>> Of Tom Young
>> Sent: Monday, October 25, 2004 8:07 PM
>> To: vanagon@GERRY.VANAGON.COM
>> Subject: Calif Smog Issues
>> 
>> Hi all:
>> 
>> Took my '82 (Federal) to a Test Only station and failed fairly
>> significantly
>> in the Hydrocarbons (HC) and Carbon Monoxide (CO).  I'd installed an O2
>> sensor in the crossover pipe but was getting very funky readings from
>> the
>> sensor so after failing Smog I took the vehicle to a local VW dealer and
>> had
>> them set the basic air/fuel mixture, which they did.  Went back to the
>> Test
>> Only station and tried again.  This time the HC was OK but the CO was
>> still
>> too high.
>> 
>> The engine is, I think, mechanically sound and the ignition components
>> are
>> all in order with fairly new plugs, wires, distributor cap and rotor.
>> I've
>> also installed a Pertronix ignitor.  The catalytic converter is new.
>> Did
>> the oil change thing, brought the car in hot, etc.
>> 
>> Question 1: At this point, it seems like the mixture is still too rich
>> and
>> the answer is to continue leaning it down.  Agree?
>> 
>> Question 2: Since the VW dealer isn't a Test Only station and can't test
>> emissions on a dyno like the Test Only stations do (I'm told the stress
>> of
>> running on the dyno tends to push up the pollutants as compared to the
>> static idle and unloaded 2000 rpm tests) how the heck do you get
>> adjustments
>> done without just going back, and going back, to the Test Only station?
>> 
>> Question 3: I've got my O2 sensor installed in the "J" bend of the
>> crossover
>> pipe, shortly after the connection to the left-side heat exchanger.
>> Even
>> after VW set the basic mixture I'm still getting anomalous readings.
>> Sometimes when I hook up the voltmeter the reading will be "high" (like
>> .710) and slowly drift upward.  Sometimes the reading will be "low"
>> (like
>> .387) and drift downward.  I've watched the voltage move up (and down)
>> across the .5 volts reading and it's very languid and constantly up or
>> down
>> without the rapid up and down fluctuations I'm accustomed to seeing on
>> my
>> California vehicle.  (I've used the O2 sensor in the California vehicle
>> many
>> times to adjust the basic mixture.)  This is with 3 different O2
>> sensors, 2
>> of them new.  Does any of this suggest some fundamental problem that
>> I've
>> overlooked?
>> 
>> TIA.
>> ---------------------------------------------------
>> Tom Young
>> Lafayette, CA 94549
>> ---------------------------------------------------
>> 
>> 
> 
> 

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jimt
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Remember that sanity is optional.
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