OBDII conversion/will this work?

[19Cutlass94]

Ok so really I have two questions. First, I have a harness from a '94 olds. I would like to swap my car to OBDII, so if I went with this swap, and now my car is OBDII. I wont be able to use the 3100, because the only ones with the removeable eprom was the Abodies. Im going to be building a 3100 with boost ( maybe if I get everything worked out ) so would I be able to use a 3400computer, and tune that for the 3100 with boost? If so, what yr/model should I get this computer out of, or does it not really matter? My goal is to basically swap in a 5spd, and have a turbo 3100. But Ill need the OBD system that I can use, so Ill have to swap in the OBDII. Now Ill just need a computer to work with everything. am I kinda on the right track in what I have to do for that?

Also, is there anyone that could convert the OBDI harness to OBDII for me?


--Jay

[IsaacHayes]

The OBDII computers don't need removable PROM's, they are just re-flashed with things like DHP. You're car is W body right? Then you could get a ODBII 3100 computer from a 96 W body.

Basically you need a wiring harness from a 96 cutlass with 3100, and it's computer. Then a DHP.

If you are swapping to manual then the computer isn't too much of a concern since it won't be controlling your automatic anymore, so one from a 3100 Wbody that works with the harness should be good enough since you will be removing the transmission codes anyways.

You'll have to swap to the new style EGR (96-99 or 00+) or just disable it. I think you can get away with just an engine bay harness swap and leave the inside alone.

[19Cutlass94]

yeah my car is a W. My car is in the sig The EGR wont be a problem, I can just block it off. However would I be able to tune a boosted engine with a 96 3100computer? even with a DHP? Ive got a '94 wiring harness, is there anyway to convert that into an OBDII ( 96+ )? Because that would make it MUCH easier since Im basically almost done pulling the motor and harness out of the donor car. The tranny would be a 282 coming out of an 89 or 90 GP with a 3.1/2.8.

Sorry about all the questions, Im just trying to learn all this stuff.

[IsaacHayes]

96 3100 comptuer is OBDII. It started in 96. I have no idea what changed from the 94/95 to 96 harness.

You could ask 3400modified he is doing the swap in his L body. Basically for the L body you swap to a 96 harness and ECM, and buy a DHP to edit and scan the ECM then. I would think the W body would be about the same

Block off the EGR and then disable the DTC codes for it. (tell it to never open basically).

Better motor as far as power goes is the 2000+ 3100 since it's large port (heads on up is same as 3400), or a 3400 of course.

You'll need to read up on the DHP and how the ECM all operates so you know what you're doing. Yes you can use the DHP to tune for a better flowing motor (3400) and boost too. You can even get larger injectors and edit the ECM tables so it can control them without flooding out at idle/etc. Which you will need if you're going boost. rickyline guy on here (may not be spelling it right) has a 96 beretta with 3400 and 5speed swap and boost. Sounds just like what you will be doing.

[geldartb]

you need a 96 knock sensor, 96+ abs pumps, purge solenoid that sits under the coil packs, and the park neutral switch on the tranny and a maf sensor if you dont already have one.
might be easier for him because dont the w-body cars mount the computer uder the hood, so yo dont have to worry about running the wires in the car.
heres some pics of the parts you will need

http://s60.photobucket.com/albums/h5/95blackz26/OBD%20II%20Swap/

[IsaacHayes]

Ah good points. I think the ABS thing can be worked around, I think I remember someone saying that, or maybe they just disabled it... The purge solenoid isn't critical either I don't think and can be turned off. He will need a MAF for sure.

[geldartb]

on the 94-96 abs pumps theres 2 connectors and on the 96 up ones theres only 1 connector. if you dont want to sit there and bleed brakes right away and can live without abs you can just plug in the big connector as you wont have the little one once you swap the harness.

[3100 MPFI]

don't forget the second O2 sensor, or an emulator to fool the PCM.

Also, if you go with a 1997 and newer, then you would have to add the fuel tank pressure sensor. At least, they list that in the 1997 wiring diagrams.

[19Cutlass94]

Would the '96+ABS pumps bolt up to my '94 brake booster? Also is that brake booster in the way of swapping in a manual ( with the extra pedal and slave cylinder stuff )

But from reading things here, if I went with a '00+ 3100 or 3400 they would already have all those sensors that I would need, well for the most part, and I would already have the OBDII harness on the engine. And would I be able to leave all the in-car wiring and just change from the C100 firewall in the engine bay? I know that connection needs to be rewired from looking/reading 3100 MPFI's post about converting his.