adjusting air/fuel mixture

[MK1Scirocco16v at comcast.net (Dave Ewing)]

So what are you guys using to measure the air/fuel ratio?  I'm just curious.
Since it is a very sensitive adjustment (a slight turn and your not gonna
pass emissions) you will need an air/fuel meter or gas analyzer.  Also
remember that messing with that adjustment is not going to change the way it
runs only the way it idles.  Lastly, too lean a mixture and your gonna start
glowing your valves and other parts causing holes to be burnt into them.
Usually this is caused by a serious problem in the fuel system and I haven't
heard of anyone burning a valve because they adjusted the sensor plate too
lean but on the other hand I'm not saying it can't happen.

Just wanted to let you know as the a/f ratio should be the last thing you
adjust with a gas analyzer after you have adjusted (correctly) the throttle
body (butterfly settings), idle, and timing (of course knowing that the tune
parts are new or good).  HTH!!

Dave
----- Original Message ----- 
From: "Mark" <mardak@cogeco.ca>
To: "Ryan Ruggles" <ryanruggles@uniserve.com>; <scirocco-l@scirocco.org>
Sent: Tuesday, September 02, 2003 7:05 PM
Subject: RE: adjusting air/fuel mixture


> > -----Original Message-----
> > From: scirocco-l-bounces@scirocco.org
> > [mailto:scirocco-l-bounces@scirocco.org]On Behalf Of Ryan Ruggles
> > Sent: Tuesday, September 02, 2003 1:57 PM
> > To: scirocco-l@scirocco.org
> > Subject: adjusting air/fuel mixture
> >
> >
> > I was trying to adjust my air/fuel mix with the 3mm allen key
> > today.  I was
> > just wondering why the car wanted to stall every time I pushede
> > down on the
> > allen key?  Does anybody know why this would happen?  THe engine is a JH
> > w/CIS.
>
>
> Totally normal, mine did that the other day when I was screwing with it...
> Even the slight pressure applied while you turn the allen key is enough to
> cause it to stumble a bit.  I took that as a sign that I was dealing with
> some pretty sensitive stuff, so I used as light a touch as I could after
> that...
>
> Mark.
> 80 S
> 81 S ABA/JH/4K
>
>
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