[Diy_efi] One wire o2 sensor to four wire sensor

[Steven P. Donegan]

One other note - I hope you welded the bung on the top side of the pipe
very near the manifold - or at a minimum of 90 degrees to 'down' a one
wire sensor requires definite heat from the exhaust to function and all
O2 sensors will get killed by condensation after engine shut off - so at
a minimum an O2 sensor should be parallel to the road surface when
installed...

On Sat, 2007-06-02 at 15:22 -0700, Mike Hudson wrote:
> Hi
> My setup is a full TBI system from a 91Chevy G20 including TBI intake and HD TBI cylinder heads sitting on a 83 350/5.7 block. 
> A 3 wire oxygen sensor doesn't have a wire for sensor ground, it uses the o2 sensor body for the ground return path.
> 
> I welded in a bung for the o2 just below the connection between the exhaust manifold and the exhaust pipe. The ground for the o2 sensor would have to go through that connection which is not the cleanest ground path. That's why I would like to go with the four wire.
> 
> The 4 wire has one wire for: o2 ground, o2 signal, heater positive and heater ground. 
> 
> 
> 
> 
> I was thinking of using something like a AC ASF-75 or NTK 21006(Narrow band)
> 
> Will the output from the 4 wire o2 output the same voltage at the same AFR as the 1 wire sensor (Narrow band) ???
> 
> Does anyone know which year and model vehicle the ASF-75 was used on?
> 
> Thanks...
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