Ob_one

I have a complete wrecked running donor 90 iroc z 5.7/Auto with the MAP set up. I plan on removing the complete engine and trans out of it to install in my 89 T/A that came factory with a 5.7/Auto MAF setup .
The 89 T/A is missing the complete TPI set up including the MAF sensor as well.
Question:

What is the easies way to get the MAP setup to work on my 89 T/A MAF SET UP.

(1) Modify my 89 MAF harness to work with the 90 MAP setup (I did read the tech article at TGO "1986-89 TPI upgrade to 1990-92 TPI ECM (MAF -> MAP/Speed-Density)" and it briefly stated the following: you can easily reuse your MAF wiring and existing knock sensor engine wiring to hook the new MAP and knock sensor to. This is a more permanent solution if you're sold on Speed Density.
(2) Should i install the harness out of the 90 iroc into my 89 T/A?
The only thing that i know of that's different between the two cars harness besides the MAP/MAF wires is that the T/A has the pop-up headlights and the Iroc does not.
I did some research and found out that i would have to repin the c100 and c207. But, i don't know much more than that.
C100 & C2007- Where are those at? Is the one behind the brake booster one of them?
I know that I'm very capable of the repin process i just need to know the exact order of the process.
Any help would be greatly appreciated

Wadebryant

I did this exact transplant / conversion to my 87 IROC. MAF to Speed Density by transplanting the whole enchillada, including the wiring under the hood and inside of the car. Not something I'd do again.

Here's an idea of what you may or may not need;
http://www.tpiparts.net/inc/sdetail/1180

Good luck

Dokken10

iTrader: (18)

Ob_one, tpi engine wiring harnesses are different from a camaro and firebird due to battery location. 90 harnesses are slightly different than 91-92. I would stick with the 89 tpi setup. Your 90 TPI intake is exactly the same as the 89 except the plenum. Use your 89 wiring harness, install the 89 plenum, 89 ECM, MAF sensor and ducts and your done. You really aren't gaining anything by changing to a MAP setup compared to your 89 MAF except the expensive MAF sensor. Why would you want the major headache,extra work and expense to install the 90 MAP setup?

Ob_one

Hey Thanks for your input. Could you tell me what the diffrence would be between the two plenums ? I only have the 90 set-up.