"dave" > wrote in message
...
>I just saw a California 1991 8V gas model for the first time here in
>Chicago.
> Totally odd stuff on the engine, at least to me:
> Different fuel injector wiring, with maybe individual wiring for each
> injector.

Correct. Individual ground wires at each injector vs. a common ground.
Allows monitoring of individual injectors by th ECU. The ECU can throw a
fault code for a bad injector (4411 I believe) and I suspect that's why the
individual grounds are there. Just a guess though on my part.

> Different throttle body switches and two stop screws for the levers.

Digi-I uses a throttle valve potentiometer instead of idle and full-throttle
switches like Digifant II.

> Engine check light. I wonder if I can hook the vag-com tool up to the
> ECM?

Yes with an adaptor. See http://www.parts4vws.com. However there is also a
procedure in the Bentley for jumping two terminals under the shifter boot to
get the code to blink out using the CEL. you can also reset/clear the codes
this way too. How cool is that! No vagcom needed really for this car.

Digifant 1 was used on California 8V Golfs/GTIs/Jettas for 1991-1992. Prior
to that it was Digi-2 but still may have had a CEL if a California car.

The CEL on 1991-1992 Calif. Digi-1 cars is in the little panel along with
the brake warning lamp and seat belt lamp.

The CEL on pre-91 Digi-2 Calif. cars I believe is actually part of a rocker
switch that is just like the other rocker switches (see Bentley for
illustration). blinking out the code on that kind of setup is even easier
(see the Bentley). you don't even need a jumper wire like you do with
Digi-1...you use the switch itself. Careful though...if you do it wrong in
either case (Digi 1 or Digi 2 and reading the codes out) you might erase the
code you're trying to get. The procedure for reading them and clearing them
differs only by swapping two steps in a different order in the process so
make sure you consult the Bentley first!

A lot of people like to hate Digifant, but my Digi-1 with its own diagnostic
capabilities that do NOT require me to have a VagCom is awesome...I love it.