---------- Forwarded message ----------
Date: Tue, 8 Apr 1997 12:42:17 -0400 (EDT)
>From: ERIC ZENO <emz@pgh.nauticom.net>
To: Tom Young <young@sherlock.SIMS.Berkeley.EDU>
Subject: Re: '86 idle revisited and other comments

    Man I think you found my problem!!!! My mixture screw doesn't
    do much backed out, just the same!!!!

     Please post this to the list!!! I'am sure that others would
     benefit!  I would but I have been kicked off!

        Thanks
                 Eric Zeno   <emz@nauticom.net>
                 86 VW-4x4
                 86 GL  For Sale (Pgh. PA)
                 72 240Z    1936 Chrysler

On Tue, 8 Apr 1997, Tom Young wrote:

> 
> On Tue, 8 Apr 1997, ERIC ZENO wrote:
> >     Hummmmm..... return spring in the sensor.... Could you be more
> >     specific as to what this is, and what you did?
> 
> In the "swing arm" type sensor (like L-Jetronic) the movement of the air 
> vane is resisted by a wound spring which looks like the spring in a old 
> clock.  Over time this spring weakens, which results in the air vane 
> staying in a more "open" (i.e., rich) position than when it was new.  In 
> my case, the spring was weak enough that even with the idle mixture screw 
> backed out fully, the mixture was still too rich.
> 
> If you pop the plastic top to the air sensor you can see the spring.  
> It's below a toothed wheel to which it's attached.  The wheel is kept 
> from spinning by a spring-steel lever arm which is lodged in one of the 
> teeth.  The idea is to turn this toothed wheel in a clockwise direction, 
> which "winds" the spring, more effectively resisting the movement of the 
> air vane.
> 
> If you try it, mark the position of the wheel so you can put things back 
> the way they were if you need to.  Put the idle air mixture screw in the 
> middle of its range of adjustment.  With the engine completely warmed up, 
> detach the O2 sensor and attach a volt meter to it.  Then turn the wheel 
> (it helps to have a third hand) clockwise until you bring the voltage 
> from the O2 meter into the .5 volt range.
> 
> 
> ---------------------------------------------------------------------
> Tom Young               young@sherlock.SIMS.Berkeley.EDU
> Lafayette, CA  94549    '81 Vanagon
> ---------------------------------------------------------------------
> 
>