TBI to MPFI

[steve ravet]

> Date:          Tue, 30 Sep 1997 18:49:17 -0600
> From:          JET <jtravel at nmia.com>
> To:            diy_efi at coulomb.eng.ohio-state.edu
> Subject:       TBI to MPFI
> Reply-to:      diy_efi at coulomb.eng.ohio-state.edu

> I have a '88 S10 2.8L I would like to try 
> to convert to 3.1L MPFI How hard would that
> be?

How are you doing the swap?  Do you have a complete 3.1L or just the 
block?  If you have the whole engine, it's easy.  If you are swapping 
parts from the 2.8 to the 3.1 it won't be so easy.

If you plan on swapping the whole engine, get everything you can from 
the 3.1L, including the accessories, brackets, charcoal can, ECM, 
engine wiring harness, etc.  That'll make it as close to a drop in as 
possible.  The only wiring you'll have to do is where the engine 
harness mates with the body harness at the firewall.  Get the factory 
service manual for both vehicles and you can easily figure out what 
wires go where.

It may seem like overkill getting everything, but it'll be easier in 
the long run.  Otherwise you'll find problems like your old brackets 
won't bolt to the new motor, or the old accessories won't work with 
the new brackets, or the connectors are all different and you have to 
search the junkyards for mates (or spend a fortune buying new ones), 
etc.

I did a similar thing to my S-10, only it was a 5.7L TBI motor.  
Wahoo!

--steve