Date: Tue, 26 Oct 2004 06:26:55 -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: <BDA3249F.47C2%wetwesty@tactical-bus.info>
Content-type: text/plain; charset=us-ascii
Ideally, the CO should be well under 1.0%. Excessive CO is due to
insufficient O2. The mixture adjustment is not going to have any effect
at speed, something is wrong. Check the ignition timing, make sure it is
not over advanced and that the advance mechanisms are working properly.
Is the EGR valve intact and working? This will help. Check the injectors
for spray pattern-balance. Last resort is to adjust the spring tension
in the air flow meter.
Dennis
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
Of jimt
Sent: Monday, October 25, 2004 11:46 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
>> ---------------------------------------------------
>>
>>
>
>
........................................
jimt
Planned insanity is best.
Remember that sanity is optional.
http://www.tactical-bus.info (tech info)
http://www.westydriver.com
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