Dummy Sensors / Testing

[rr]

Hey, nice setup putting the TPI TB on the manifold. I didn't recognize
the make of the manifold. Can you fill me in a little? It appears to
have been stock with PFI, but do I also see a TBI on the bench?

Thanks,

BobR.

Bob Valentine wrote:

> I'm planning on doing a bench mockup of my system this weekend, along with
> building a 555 VATS bypass (I've read the notes in the archives), but a few
> questions before I get too far under way.   I'm hoping to get to the point
> I can at least get it to kick the fuel pump, spin the distributor and get
> the injectors to fire.  I've never had this ECM (165) running in a car, so
> this sort of a basic life test.
>
> 1.  VATS bypass - is the signal "full wave", eg +2.5 / 0 / -2.5 ?
>
> 2.  What's the easiest way to verify that the ECM is "alive" and that I've
> bypassed the VATS?
>
> 3.  I have a full engine sensor compliment, but none of the emissions
> solenoids.  Will the ECM (for now) ignore these, or do I need to present
> some sort of dummy load to it?
>
> 4.  On a '89 Firebird TPI schematic I have, the VSS input ("Speed Input")
> is shown going to a "VSS Buffer".  What's this?
>
> If anyone's curious as to how I mounted the TPI throttle body to the
> intake, pictures are here ->  http://www.liii.com/~ravalent/tpi/
>
> The solid plate below the TPI has been drilled - got a gasket for template
> today.
>
> --> Bob Valentine
> --> bob at tecmark.com