[Diy_efi] Olds 403 MPFI Project

Justin justin justin_email at lycos.com
Thu Aug 18 16:48:38 UTC 2005


  Thats alot of useful information but I was wondering why couldnt you just=
 use the stock seville throttlebody?  Its already made for the manifold.  -=
 Justin
----- Original Message -----
From: "Christian E. Carson" <fastcarson at prodigy.net>
To: diy_efi at diy-efi.org
Subject: Re: [Diy_efi] Olds 403 MPFI Project
Date: Wed, 17 Aug 2005 23:35:01 -0400

>=20
> This is a doable project using all junkyard parts. You just need a lot of
> time to gather the parts, and a lot of patience to assemble them and tune
> the beast.
> For reliability and ease, I would highly recommend using the stock intake
> off a 1976-1980 Seville. These cars came with the only factory MPFI Olds
> engine (it was a 350.)  You can even use the stock injectors with a minor
> modification to the ECM.
> I just did this on my 1990 Olds Custom Cruiser's stock 307, just to see i=
f I
> could. It starts and runs, but the 307 is in a poor state of repair and I=
'm
> now pulling it in favor of a diesel (gotta beat those gas prices).
> Anyway, here is what I did:
> 1227749 ECM from Turbo Sunbird/Syclone/Typhoon. Modified as per instructi=
ons
> on this website: http://mywebpages.comcast.net/p-928/749mods.html (Bill is
> still on this list, IIRC, he can state that this modification has lasted =
him
> thousands of miles in his Porsche.)
> Stock Seville 38 lb injectors.
> Wiring harness from 86 Camaro TPI (any 86-92 will work really, all of them
> need some modifications).
> TBI unit from Chevy 4.3- 5.7 mounted to intake with adapter.
> External fuel pump from 89 Ford truck drawing from a surge tank fed by the
> stock fuel pump. (The surge tank is a stock VW part:
> http://scirocco.dhs.org/vw/pics/0-allyn/images/020510-154136-Z10.jpg)  You
> can skip the surge tank part if you don't plan on going below 1/4 tank or
> take any hard turns, but I'm a crazy, cheap driver so I considered this a
> requirement.
> The stock VSS will put out a 2000 ppm signal which can be input to the ECM
> (you just have to find the right pin)
> The stock knock sensor and filter can also be used, though I'm not sure h=
ow
> well it would work on your 403. The pin isn't listed on any pinouts, but =
you
> can find it in Ludis' site. I believe it's B8, labeled "ESCIO".  (Just
> remembered - an '87 307 shouldn't have a knock sensor, so you don't have =
to
> worry about that.)
> You can't use one of the brackets on the A/C compressor, but I believe
> that's about it.
>=20
>=20
> Anyway, you REALLY want to look at this website:
> http://www.grimers.com/vehicles/olds/403efi/index.html
> It happens to be about nothing less than converting an Olds 403 to EFI in
> the very way I mentioned above.
>=20
> Chris
> ----- Original Message -----
> From: EEOLAY5 at aol.com
> To: diy_efi at diy-efi.org
> Sent: Wednesday, August 17, 2005 7:30 PM
> Subject: [Diy_efi] Olds 403 MPFI Project
>=20
>=20
> Hello I am Theo.
>        I am attempting to MPFI a 1979 Olds 403 for my 1987 Buick LaSabre
> Estate Wagon. The finished project must support ALDL scanning, 200R-4 Tra=
nny
> Lockup and 49-State Emissions. The finished project will be a daily driver
> for street use only. I would like to keep the project all GM-AC Delco usi=
ng
> Multec Injectors and related sensors. Will anyone with related experience
> Please help me in getting this project started. The budget is limited to
> building this thing reasonably. All comments are welcome.
> Thanks,
> Theo.
>=20
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> Diy_efi mailing list
> Diy_efi at diy-efi.org
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--=20
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