"Rex B" > wrote in message
...
> dave wrote:
> > Try turning the CO adjustment screw for best idle and see what that
does.
> > Then turning that screw out (CCW) should lean the CO and the engine
should
> > become more responsive.
> > Adjusting that screw should have an effect on off-idle response too
AFAIK.
>
> This is the 3mm screw below the hole by the fuel distributor, right?
> So screwing it in (CW) should richen the mixture?

It should.

> > You can, or should be able to, hook your VOM in series up to the Fuel
> > Pressure Regulator to read it's voltage.
>
> I was told by a VW tech that the O2 sensor wasn't getting hot enough to
> do that, due to a convertor whose guts were gone. O2 sensor is in the
> cat convertor shell, shielded from direct exhaust flow. So I haven't
> done that.

Your 02 sensor should be a heated one and come online within a few minutes
of the engine running.
Also I like to check the FPR voltage to make sure that there is some and
also that it changes.