Yes, disconnect the O2 sensor AND the idle stabilizer.

That might get you in the ballpark. The only *real* way to adjust that
screw is with a CO (carbon monoxide) detector. Misadjustment of this screw
can really "screw" with your engine.

So, beware.

Jon (The shade-tree FI guy)

On Wed, 14 Feb 2007, Mike Frost wrote:

> So I have convinced myself that I need to adjust the mixture screw on the
> AFM but I have some trepidation about it. There are two things I want to
> verify before I begin:
>
> 1. To adjust properly, I disconnect the O2 sensor and measure it's voltage
> at idle, with a target of 0.5VDC.
> 2. Turning the screw clockwise will lean the mixture?
>
> Mike Frost
> 86 Vanagon GL
>