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Date:         Wed, 7 Oct 1998 23:01:23 -0400
Reply-To:     EMZ <vw4x4@FYI.NET>
Sender:       Vanagon Mailing List <Vanagon@vanagon.com>
From:         EMZ <vw4x4@FYI.NET>
Subject:      Re: Emissions Testing, passed! (third time's a charm)
Comments: To: kenneth d lewis <kdlewis@JUNO.COM>
Comments: cc: Vanagon@VANAGON.COM
In-Reply-To:  <19981007.194156.9983.0.kdlewis@juno.com>
Content-Type: TEXT/PLAIN; charset=US-ASCII

my guess would be getting the motor hot by dirving around. This is the munber 1 cause of failure!

Eric 86-VW4x4 vw4x4@fyi.net 72-240z Pittsburgh, PA USA 1936-Chrysler

On Wed, 7 Oct 1998, kenneth d lewis wrote:

> Greetings and Salutations; > Here is a brief synopsis of actions I took to get my truck to pass. I did > not use any stop-gap solutions but strove to pass legally. > ------------------------------------------------------- > First testing: > Reading Standard > Hydrocarbons (ppm) 266 ppm 220ppm > Carbon monoxide(%) 0.40 1.2 > Carbon dioxide(%) 11.8 > Engine RPM at reading 894 > -------------------------------------------------------- > Where upon I proceeded to: > 1> poll the list for suggestions. > 2> changed the oil. > 3> Set the timing properly. I had it slightly advanced to improve > performance.* > 4> Checked compression(125,125,125,139). Noticed #4 plug looked > wet,appeared to be a small amount of oil. > 5>Attempted AFM calibration using O2 sensor and adjusting spring. I > felt positive results were achieved. > 6>Ran a tankful of gas with Injector cleaner through. > 7>Drove for 15 minutes at 65+mph to testing station to warm up > engine. > Second test(about a month after first) the readings were about the same! > HC still failed. > Back to the drawing board. > > A> Purchased K&N air filter. > B> Replaced both fuel filters. > C> Fuel rail hoses looked bad so they were replaced. > D> Switched to Platinum plugs. Reasoning here was better firing if #4 > was oil fouling. > E> Set idle stop as per Bentley. > E(1)> Re-did AFM calibration. > F> Reset idle. Ended up turning Idle Set screw almost all the way > in. This took several turns. Made up the balance of idle air > with the Air Bypass Valve(aka idle stabilizer valve) > adjustment.** > F(1)Test ABVs current as per Bentely=430mv. > G> Drove around for about 40 minutes before testing. > H> Went to a different tester. > I> First customer of the day so I was tested immediately after > machine's daily calibration. > ------------------------------------------------------- > Third testing: > Reading Standard > Hydrocarbons (ppm) 99 ppm 220ppm > Carbon monoxide(%) 0.04 1.2 > Carbon dioxide(%) 7.9 > Engine RPM at reading 883 > -------------------------------------------------------- > > HC was less than half and CO2 improved by a factor of 10!! I wish I could > point to a single action that did the most good. > > *The performance now, with near factory settings, seems as good as ever. > **I do not recommend "experimenting" with this adjustment, I think that > is what fouled things up. Right before this I had a very rough cold idle. > My theory is the engine has two sources for it's idle air. The throttle > body and the ABV. I believe this ratio got way off. I still had the > correct volume for good hot idle but there was insufficient going through > the ABV to modulate a good cold idle. There is no procedure in the > Bentley, I learned about it on the list and fooled with it to try and fix > a problem several months ago. > > Drive Safely & Good Luck > Ken Lewis<Kernersville,NC>86 VW crewcab;60 T-5 Coupe > > ___________________________________________________________________ > You don't need to buy Internet access to use free Internet e-mail. > Get completely free e-mail from Juno at http://www.juno.com > or call Juno at (800) 654-JUNO [654-5866] >


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