At 10:15 PM 7/26/2009, David Clarkson wrote:
>Just a question after some research of the archives. I feel that my green
>O2 sensor input wire (sending voltage to the ECU) is shorting to the
>grounded shileding in places from deteriorating insulation.

Whence comes this feeling?  Frankly it's pretty unlikely.  The
ordinary place for it to short is at the end, where a bit of the
shielding might accidentally touch the center lead especially if
someone weren't aware it was shielded.  Otherwise, unless there's
obvious physical damage or crimping of the green shell I'd put it
about last place as a possibility.  Do you have voltage measurements
supporting the idea?

>  I plan on  replacing
>the sensor itself soon and am thinking about replacing the cable also.  The
>archives have several listees stating that unshielded cable should work okay
>so long as there is no EMI in the vicinity of the cable (I'm concerned
>about  possible interference from the coil).

Just wait until the next trucker with a kilowatt CB drives up
alongside and keys the mike...however, VW shielded the part that's
very near the high-voltage wires and left the rest alone.  Knowing
that VW never spent a nickel unnecessarily, I'd be inclined to use at
least as much shielding as they did.

But seriously, I very much doubt there's a problem internal to the green wire.

  --
David Beierl - Providence RI USA -- http://pws.prserv.net/synergy/Vanagon/
'89 Po' White Star "Scamp"