ok, I found the link - try this
http://www.geocities.com/MotorCity/1760/tuneup.html
text below quoted from that page, go there if you can't read it
Certain Motronic DME's have a tiny rotary switch on them. The idea is to
allow qualified service technicians (or you, the knowledgeable tinkerer)
to
adjust fuel mixture and ignition timing to supposedly "compensate for the
quality of locally available fuel."
Of course, fooling around with this might help your car's performance, it
can also hinder it. You might have problems come emissions-test time, so
keep track of what you're doing here.
The eight-position rotary switch is found through a little hole at the
back
of the DME box. The switch has a triangular-shaped recess in which to
insert
a special adjustment tool. In the 944 FAQ it says you can whittle down a
golf tee to make one.
Apparently, all DME boxes are set on position 1, so that's usually
considered the factory stock position. The switch will click in detent
positions, so you must count the clicks in order to ****ft the DME's timing
and mixture settings to your choosing.
SWITCH
POSITION FUEL MIXTURE
ADJUSTMENT
(%) IGNITION TIMING
ADJUSTMENT
(degrees)
Factory "stock" - 0 - - 0 -
2 + 3 - 0 -
3 + 6 - 0 -
4 - 3 - 0 -
5 - 0 - - 3
6 + 3 - 3
7 + 6 - 3
8 - 3 - 3
--------------------------------------------------------------------------------
"dave AKA vwdoc1" <vwdoc1@[EMAIL PROTECTED]
> wrote in message
news:Ggh_i.22608$JD.5409@[EMAIL PROTECTED]
>
> "William Noble" <nobody@[EMAIL PROTECTED]
> wrote in message
> news:4737e836$0$26449$88260bb3@[EMAIL PROTECTED]
>>I know I said I wouldn't chime in again - let me point out that a 924S
is
>>not a VW, and it really does't matter what VW used to meet california
>>emission standards, that timing is controlled by the computer, there is
no
>>mechanical timing adjustment, and that NOx does NOT come from a hot
>>exhaust, it is a combustion product
>
> I guess that the 924S does not have anything special or extra if
designed
> for CA emissions.
> I also thought that NOx was caused by heat, but I guess I was wrong.
> Then I stand corrected!
> Thanks William! ;-)
>
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