Shielding the O2 Sensor Wire

[Joe Scruggs]

I've had good luck with braided shielding in other applications
(specifically, fire and gas detection systems), but it is very critical NOT
to ground both ends.  The shield needs to be grounded on one end and the
other protected by heat shrink or any method to prevent it from creating
another ground path.  What happens is the creation of an antenna.  I missed
putting heat shrink on one end of a cable and only a few wires from the
braid touched the conduit.  When a portable radio was brought into the
vicinity and keyed - the system tripped.  It turns out that no shield is
better than one grounded on both ends (in my experience anyway).

Joe

----- Original Message -----
From: "Len Sabatine" <sabatine at epix.net>
To: <gmecm at diy-efi.org>
Sent: Saturday, May 26, 2001 1:38 PM
Subject: Re: Shielding the O2 Sensor Wire


>      Braided ground shield seems to work best , both ends grounded.
>      It does help remove any Rf garbage from the signal .
>      A Scope will show how much trash is present in the general area.
>     There's filtering built into the ECM for this purpose as well.
>      Len
>
> >I posted this a week or so ago but apparently the server was down so here
> >it is again.
> >
> >Many months back some posted a comment to gmecm about shielding their O2
> >sensor wire to eliminate a problem with ignition noise. If you are still
> >around I'd like to hear more about what you did. Shielded cable
impedance?
> >Length? How the shield is grounded, one end or both ends?
> >
> >Thanks.
> >
> >Don Burns
> >
> >
>
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