Re: VSS differences for 746 to 730 swap

[Shannen Durphey <shannen@grolen.com>]

olbap wrote:
> 
> Hey all,
> Lemme preface with IM SURE THIS HAS BEEN GONE OVER but the archives have
> been down for some time it seems so forgive me.
> 
> I want to swap to a 730/727 on my 89 firebird running TBI. As I stated in
> the last post that was ignored :) Ive figured out all the pins that need to
> be changed.. etc etc.. pretty much know how to wire it up. Its a peice of
> cake..  The one difference i see is VSS. I know there is a guy on the list
> who did the 165 - 730 swap and lists something about a custom prom neccesary
> for vss function in his list of pinout changes.
> Looking at the diagram i have the VSS seems to have a power wire seperate
> from the ecm and a ground shared with the power steering switch and gear
> selector switch on the 746 ecm (im guessing). 

You're looking at the VSS Buffer.  There are 2 wires from the VSS,
plus one to ground, and one from ignition power.  You can remove it to
get a direct signal from the VSS.  

I'm not so sure you want to run TBI with the TPI ecm.  Someone else
could better answer this, though.
Shannen

The 727/730 is just an in and
> out deal from the vss.
> I suppose if it came down to it i could swap the VSS out but id rather not
> do that cause im a poor student
> I know someone out there knows this
> 
> Thanks
> Pablo
> 
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