CPI Swap Question..from TBI

[Kurek, Larry]

So...(BTW, Thanks for the info), are there any other tidbits you can
offer?  

I just got  the CPI manifold with all the sensors yesterday and did a
preliminary check of compatibility. Like you said, I need a new TPS
connector, injector connector, and suprisingly, I need to hook up an IAT
sensor, and get a new EGR connector (since the CPI uses a different EGR
valve with feedback than the Astro TBI). Finally, I found I have to run
a relay to the air valve in the manifold...again no big deal, but now I
have to find a connector for the valve itself...oh joy. Do you have a
source on these connectors anywhere? I don't want to go through GM since
they charge $20+ *just* for connectors...grrrr...

Thanks!

Larry

PS> How does it run? Are you happy with the performance? 

> -----Original Message-----
> From:	peter paul fenske [SMTP:ffnsp955 at bcit.bc.ca]
> Sent:	Sunday, June 28, 1998 2:27 AM
> To:	diy_efi at efi332.eng.ohio-state.edu
> Subject:	Re: CPI Swap Question..from TBI
> 
> Hi Larry
> 
> Well I hooked up a 97 4.3 vortech to a 730 ecm in my S10.
> I essentially followed the wiring diagram fer a 91 camaro
> and used the 3.1 auto cal for the camaro. 
> The 97 differs from earlier cpi in that 6 injectors feeding
> poppets are used instead of one central injector.
> These were saturated types which the 730 can drive
> 
> I have afeeling the old cpi is peak and hold.
> Measure the dc resistance if it is 2 or 3 ohms it is peak and
> hold. 
> 
> So prob go to the 747 4.3 application. use the wiring as is
> make up a plug fer injectors.
> The tps on mine was the same as 2.8 3.1 style plug
> so you might need a different plug. wrecking yard or
> parts store should do it. 
> 
> All the other sensors are identical.
> 
> You might have to adjust the base pulse but you might luck
> out and all will be fine.
> 
> As for the air divider well a lot of people leave it out.
> It does give a bit of better low end torgue but at
> a cost of a wee bit of top end breathing.
> 
> take care:peter
> 
> Ps use your stock HEI. Don't have wiring, most public
> libraries do have mitchells.
> 
> >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
> >
> >