Oxygen Sensor Replacement - Try A Redundant Ground Lead

[Dave Zug]

Hey Walt THANKS for the info! I had been wondering about my double gasketed
header installation, I buzzed a bare spot in one of the bolt heads and
flange and I will definetly look for one of those models.

----- Original Message -----
From: Walter Sherwin <wsherwin at home.com>
To: <gmecm at diy-efi.org>
Sent: Sunday, October 15, 2000 6:54 PM
Subject: Re: Oxygen Sensor Replacement - Try A Redundant Ground Lead


> Someone later pondered "what's the diff" between the three heated O2 P/N's
> listed in my prior post.  Good question!  The diffs are minor, and are
> described as below.  Basically, whichever one you can find will work for
> you.  Happy hunting...........
>
> AFS-40 is "water resistant", and has 4 leads.  Two leads are power &
ground
> for the heater.  One lead is the O2 sense wire.  The last lead is a
> redundant ground, which is also electrically connected to the shell
threads.
>
> AFS-45 is a "water proof" version of AFS-40, which just means its a bit
more
> tolerant of moisture.
>
> AFS-60 is basically the same as AFS-45, but has a slightly different
heater.
>
>
> Walt.
>
>
>
>
>
> > This may get covered below, (I haven't read that far yet),  but you
might
> > also want to peruse the following heated O2 sensors since you said
earlier
> > that you also have custom exhaust headers in your application.
> >
> > AFS 40  (25108302)
> > AFS 45  (25132086)
> > AFS 60  (25132529)
> >
> > Why these sesnsors?  Well, they are all heated single wire type zirc
O2's,
> > **BUT** they also have a redundant ground sense lead.   In a normal OE
O2
> > single wire sensor setup, the threads of the shell are expected to
ground
> > thru the cast exhaust manifolds and eventually connect to the ground
plane
> > of the cylinder block, to which the ECM/PCM lo-signal sense circuits wll
> > also be coupled.  If you add custom headers in between, you often will
> have
> > also introduced high temp coatings, high temp silicones,  non-conductive
> > gaskets, etc.,  all of which can mess with your electrical connectivity
> > between the sensor shell and the engine block.  That's why the redundant
> > ground lead is handy.  Just connect it to the cylinder block, and then
do
> > whatever you want with your custom exhaust system.  One way or the
other,
> > (through either the lead or the shell) you will be connected and
operating
> > as intended.
> >
> > For those of using using non-heated O2's with custom exhaust systems,
the
> > following P/N is applicable.
> >
> > AFS 23  (25106169)
> >
> > These are all direct screw-in functional equivalents, for the most part,
> but
> > they may require some connector fiddling/adaptation depending upon
exactly
> > what you are trying to accomplish.
> >
> >
> > HTH's
> > Walt.
>
>
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