O2 Sensor Current?

[Thomas Martin]

How would the ECM react or the O2 sensor react with a 1M from O2 sense to GND?

I will look into the Op Amp circuit, probably best way.

Has anyone on the list ever decoded the PROM on the 307 "Y" engine?  Is there an older version of code with less part throttle spark advance?  Can
someone program a chip for me?  I do not have a programmer that will burn the 27S181, I have contemplated adpating a different rom for it, I have one in
mine, (don't remember it right off hand) but is is nearly pin to pin compatable, but has 2 more than the 27S181.  I have a Data !/O 288A programmer.
Anyone use one?  It will not read my 27S181, anyone know how I can make it?

My long term prject is to TBI this car, I think it would be a great running car with a TBI on it, or better yet, SFI.

Thanks!
Tom Martin
85 Cutlass Supreme Rocket 350 CCC

>
>
> Date: Wed, 24 Mar 1999 22:45:19 -0800 (PST)
> From: Orin Eman <orin at wolfenet.com>
> Subject: Re: O2 Sensor current?
>
> > This is the standard way of telling if the O2 is at temperature yet... many
> > systems will bias the sensor to .45 volts through a very high resistance (10
> > megaohms I believe).  Once the sensor is at temperature, it does provide
> > enough current to move the voltage away from the preset level.
>
> I seem to remember the bias resistors in my ecu were 768k.
> The O2 sensor's impedance isn't _that_ high or you could never
> get sensible results looking at it with a regular 1M impedance scope!
>
> I beleive it's in the 10 to 100k range when hot.
>
> Orin.
>
> -----------------