On 10/26/04 12:00 PM, "Joseph Fortino" <fortino1@earthlink.net> wrote:

> 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
>>> ---------------------------------------------------
>>> 
>>> 
>> 
>> 
> 
That is the adjustment location on the aircooled.  Be careful setting that
little wheel in the box though.

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jimt
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