Ground loops and 730 ECM

[Vinnie Moscaritolo]

Ludis Langens wrote

>  Um, The O2 ground is E15, not E5

oops typo, not wiring mistake.


Plan 1:

>
>Wire pin E15 as close to the O2 sensor as possible.  I've seen GM hook
>this input to a bolt in the end of the cylinder head.

I was considering this.

  but then Bruce Plecan wrote


Plan 2:

>
>I'd first do it the way GM designed it, with the sensor grounds and ecm
>grounds all tied together at the block.  Then the O2 is mute.
>If you have to do it your way then there are 4 wire O2s used on the later GM
>cars.   Vettes  come to mind.  I'd use a front one (all the 4 wires I know
>of come with the pre and post O2 setup)(anyone hear / know different?)

OK lets say I go to a four wire unit.   can someone give me an 
applicable part number
that I can give to the rocket scientists down at NAPA.?

next question is what is the pinouts for the four wire units?

I don't belive I need to preheat the sensor since I mounted it pretty 
close to the exhaust manifold,
Only about 12-18 inches away..Actually its in the crossover pipe so 
it sees both sides..
(although I don't belive that even matters)


any advice?

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