O2 sensor grounding; was RE:O2 sensor 4wire

[Greg Woods]

> > I saw that someone mentioned a Ford 4 wire O2 sensor.
> > Is there any sensors/brands that would offer me an alternative to
the
> > Toyota 4 wire sensor I have to replace this week?
> > Thank you
> > 

> My recollection is that a 4 wire is power and ground for the heater , 
> groundfor the sensor, in case the exhaust system is "floating" and the

> signal for the sensor signal.  A well grounded 3 wire should work, or
use 
> the sensor ground to ground the exhaust.

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

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

TIA. and BTW, even with the off topic messages, I love this list!

Greg Woods
gwoods at sytmx.com
austin, tx
86 cherokee w/GM TBI