O2 sensor grounding; was RE:O2 sensor 4wire

[Tom Cloud]

>When I first thought about this thread on 4 wire EGO's I thought, "why
>would you need that? just use the exhaust as ground"  Then I got to
>thinking about how my exhaust is grounded (not well) and I'm thinking 
>maybe I should convert my retrofitted GM TBI single wire O2 sensor
>to a multi wire sensor with a dedicated ground (I have been getting
>some intermittant 02 sensor faulty errors from my ECM, but I thought

it's actually amazing that a sensor with a fairly hi-Z output driving
a 10M-ohm or so input works as well as it does .... considering all
the noise sources near it.  I run RG-188 (miniature, shielded, teflon
jacketed coax) to mine.  The 4-wire sensor no longer relies on
cast-iron blocks and rusty exhaust pipes as connections for the
hi-Z signal.

>it was just freakin out).  So let me ask this stupid question: does 
>this ford sensor puts out the same 0 to ~1V signal as the GM?  Does GM

yes (with some exceptions) ... but, yes for you   ;-)

>not make
>a multi-wire sensor?  What is the cost of the ford sensor?

when I went to PepBoyz to get one for my '91 F-150, I found
that was the only year they didn't have a listing for (it
is the only year they used the 4-wire sensor).  Ford wants
something on the order of $85 (my discounted price)  8^)

>oh and one last stupid question: do all injectors use the 18 X 1.5mm
>thread?

all I know of

below is copy of post I received quoting price on EGO sensor
for 1991 302 F-150

 ========

Date: Wed, 31 Jul 1996 17:44:03 -0400
From: Partlink at aol.com
To: cloud at hagar.ph.utexas.edu
Subject: Re: catalog - quote


Part #1060  $38.01

This is our 4 wire oxygen sensor.  You can e-mail your order or call at
1-800-347-2702.  We charge $5.00 S/H on orders under $100.00 and we pay the
freight for orders above $100.00.  We except Visa/Mastercard/COD/or check in
advance.
Any questions or concerns let us know!

Thanks!

Tom Cloud

They say the mind is the first thing to go ... and I can't remember the second