fbodyguy86

i need some help with wiring i just converted my 89 rs which was TBI to TPI so i pulled all the computer wiring out ofthe car some of it an into the drivers side into the fuse box so i cut all the wires out that were for the motor and then put the rest back in that hook up to the heat, AC, cooling fan dist and some temp sensors on the heads. Now my new harness i bought of ebay for the TPI also has the heat, AC and things integrated into it but doesnt run to the fuse box, I am using a 165 ECM for the MAF system Which wires do i eliminate for the heat AC and things like that from the new harness or coming from the fuse box

thanks
George

89 RS T-top
305 converting TBI to TPI

89Vert

you should only need to swap the engine harness,

the chasis harness is the same

Kevin91Z

On an '89 the computer harness and chassis harness are together in the same wire loom. You shouldnt have pulled out any wiring, as its only a matter of changing a dozen wires around to convert from TBI to TPI. The basic harness is the same, only one or two things are different under the hood, and the ECM connections are different.
I cant see what you pulled out and what you left so I cant help you from here.

89Vert

on my 89 engine harness is seperate from chassis harness,

I know know a guy thats done a few TBI to TPI swaps,

pulls TBI engine and harness(with harness still conected to motor) and installs TPI,

he wrecks cars, more specifically 87-92 Fbody's some caviliers and stangs
everytime he pulls a motor he leaves the harness on the engine, says its faster

I'll double check with him, he did a 350TPI 5 speed swap on my bros 88 RS 305TBI auto,
he took an 88 305 5 speed Iroc and an 89 350 G92 GTA and put them to gethter on an 88 RS Vert chassis, turned out very well

fbodyguy86

but i dont know what year the TPI harness came out of and it doent plug into the fuse box i do know that it still has the cold start injector and the MAF hookup on it i am in Milwaukee, WI if you wanted to come by and take a look at it to see what i got it would be great

thanks
George

89 RS T-top
305 converting TBI to TPI