CPI Swap Question..from TBI

[Shannen Durphey]

I'm working from memory here, and a pretty poor one at
that.  The injector has a different connector on it than any
other GM injector I've had to hook up to.  Also, there's a
manifold tuning valve in the upper intake which you will
need to connect.  

Shannen

Kurek, Larry wrote:
> 
> OK Guys...I'm in need of a little help on this one. I have done quite a
> few carb to MPFI/TPI conversions, but most of them have included a
> factory harness which I was able to hack and splice into the factory one
> (no patent problems with this...is there? ;) ).
> 
> In any case, what I am doing is swapping a CPI manifold and system onto
> an 87 Astro with TBI. For those of you that don't know, the CPI system
> is a multi port (actually, one injector with multiple nozzles) system
> that GM designed for use on 4.3 V6 engines. I think it came out in 1992,
> and is still in use (aka Vortech engines). So, my question is this...
> 
> Short of finding a factory Astro harness for use with this manifold,
> what do I need to do to make the TBI harness work with the CPI. I assume
> I'll have to repin the ECM connectors, and possibly get new connectors
> for the sensors/controls on the CPI. Does anyone know how adaptable this
> is? Also, can I use the same ECM, with perhaps a different Mem-Cal?
> 
> FWIW, I am buying this manifold as a take-off from Howell EFI, and they
> *do* offer a factory harness modification service...for around $550.
> Being the frugal type, I'd rather do this myself.
> 
> PS...does anyone have a copy of a 1992 wiring diagram/pinouts for the
> CPI motor? I know it came in S10 trucks, Blazers, and Astro vans....
> 
> TIA!
> 
> Larry Kurek