[Diy_efi] Running headers with factory GM TBI

[Brian Dessent]

steve ravet wrote:
> 
> Jeff Behrens wrote:
> >
> > Does anybody know if I can parallel the two O2 sensor
> > readings from my headers into one and feed it to the
> > factory computer?  I am working on a 1991 Z71 trying
> > to go back to the factory TBI with headers now.
> 
> That's not going to work, the signals won't be synchronized and the ECM
> won't be able to see the cross counts.  Pick one side or the other, or
> use a switch to select.

Right.  Consider the scenario where one o2 is trying to pull the voltage
low and the other high.  The result, if you model the sensor as a
voltage source with a very high source impedence would be some
indeterminate value somewhere in the center... in other words it would
be a mess.

Brian

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