This wire on my vehicle looks about 16ga, quite small.  It goes
unshielded from the O2 sensor about 15", snaking up into the engine bay,
where it enters the wiring harness and crosses another couple of feet into
the ECU...

   The original shielded wire, that may be shielded  like that because it
runs right inside the harness, in actual physical contact with lots of
other wires and these may, being so close, impart a bit of interference
with the signal....hence the lead (?) shielding  around the O2 sensor
signal wire....   Since the signal is such a small electrical amount, I was
thinking the actual wire size might make a difference in what the ecu gets
from the O2 sensor...

   I was even thinking I might try to 'fish' another wire through the
original shielding...but that probably won't work...so I was also thinking
of just splicing in another wire with shielding...Dang fussy little
things...but the O2 sensor is good for an extra 5-6 miles per gallon on my
digifant inline motor, so it's doing a good job...

On Fri, Sep 19, 2014 at 2:03 PM, SDF ( aka ;jim lahey' - Scott ) <
scottdaniel@turbovans.com> wrote:

> I've seen a new coax spliced into the original one a few inches from the
> ecu.
> I'd try that as it's simple to do.
>
> I have read that a coax shield  should only be grounded at one end, fwiw.
>
>
>
> On 9/19/2014 10:26 AM, Neil N wrote:
>
>> Mobile CB coaxial wire?  Image:
>> http://upload.wikimedia.org/wikipedia/commons/thumb/7/73/
>> RG-59.jpg/400px-RG-59.jpg
>>
>> Does the shield on your current O2 wire connect to your ECU? If so,
>> and if you replace the entire wire, connecting that shield to the ECU
>> pin might pose a small challenge.
>>
>> The O2 "signal" current must be incredibly small. Wire gauge of
>> coaxial wire is small but should handle it.
>>
>> My only thought is heat-vibration possibly affecting the coax wire.
>> The centre lead isn't stranded. Might fail soon at point it connects
>> to O2 connector?
>>
>> Route thoughtfully?
>>
>> On 9/19/14, Don Hanson <dhanson928@gmail.com> wrote:
>>
>>
>>  .so I am wanting to replace the whole wire, all the way from the O2
>>> sensor
>>> to the ECU..
>>>
>>> Second question:  Where might I source wire like that
>>>
>>
>> --
>> Neil n
>>
>> Blog: tubaneil.blogspot.ca
>>
>> '88 Westy http://tinyurl.com/c8rlw6p
>>
>> '81 VanaJetta 2.0 "Jaco"  http://tubaneil.googlepages.com/
>>
>> Vanagon VAG *Gas* inline-VR Engine Swap Group:
>>
>> http://tinyurl.com/d7gd5ej
>>
>>