Date:         Sat, 28 Jan 2006 16:10:17 -0800
Reply-To:     mark drillock <drillock@EARTHLINK.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         mark drillock <drillock@EARTHLINK.NET>
Subject:      Re: Oxygen sensor coax
Comments: To: vw4x4 <vw4x4@VERIZON.NET>
In-Reply-To:  <43DBFF67.9070305@verizon.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Yes, shield it or run it where there is little or no interference. I
recently put my oscilloscope on the O2 lead of one of my Vanagons when
getting it ready for a smog test. For fun I pulled the unshielded part
up near the ignition coil but it made no difference. It did put a little
more noise on top of the signal but did not change the response of the
ECU to the sensor reading as far as I could tell. I have seen lots of
Vanagons with the unshielded sensor wire zip tied up nearer to the coil
than I would have thought wise but it seems to not be a problem.

Mark

vw4x4 wrote:

> Marc,
>    Most of the time you are right, that using unshielded
> wire will not make a difference.    The problem comes
> into play if there is a source of electrical noise like a plug
> wire or a high frequence source is near by.
>                                                 Eric
>
>
> mark drillock wrote:
>
>> I doubt that it makes much difference as long as the center conductor is
>> stranded. Almost half the O2 wire run on a vanagon is unshielded anyway.
>> The frequency of the signal is in the 1 hertz range. People often hook
>> up 15 feet of unshielded cable to connect a monitor or O2 led display on
>> Vanagons. List member Ken Lewis makes and sells one that mounts in the
>> unused switch hole in the instrument cluster.
>>
>> Mark
>