Hey, in order to switch to OBD1 (from speed density), what do I need? This is my understanding thus far.. If I use a 94 harness/pcm, it should be a direct swap to the car (without changing body harness) right? All I would need is a maf (optional), heated o2's and a new IAC right? Thanks in advance for any input!!

 

Just found out the bulkhead connector on the pass. side strut tower (the part of the engine harness that connects to the body harness), the wires are for the same purpose, except for one. Cavity D in the 93 harness is for the Serial Data Signal, while Cavity D in the 94 harness is for Traction Control Active.. So where is the serial data signal for the 94 harness? I guess it's not as direct of a swap as I thought? Shbox? Anyone? lol

 

You would be better off investing in the EFIConnection setup at this point. Any LTx+ stuff is not going to work as good and be user friendly as the LSx stuff.

 

I agree, but the wallet doesn't permit at the moment. I found everything I need for a pretty good price and I just want some quick tuning for the time being (from speed density to OBDI). This isn't for my car (in the sig). That will be getting a fast xfi or equivalent some day. I'm just wondering if the 94 harness/pcm is a drop-in into a 93 car. Thanks for the suggestion though!

 

You will need a 94 ICM for sure.

 

They're all the same though, aren't they? I thought just the coil changed in the 96+

 

I know there are people who have done this swap.. Someone please chime in?

 

X2 to this I would save up for the right stuff.

But I might have an extra PCM laying around if you need one. Im not sure why you would be limited to 94 like someone posted?

 

This is going into a bolt on car.. Why would I invest into the LS1 conversion when my actual "fast(er)" car doesnt even have that? lol.. I am limited to a 94 harness because the body harnesses in the 93+94 cars are pretty similar (just 1 wire is different from my research in bulkhead connector C100).

 

no opti, coil per cylinder, and better tuning software. idk, just a mod i would do on anything.

alright didnt know that about the harness.

 

I have no issues with the opti, so I'll keep it..



Where are the people who have done this swap? They would be helpful!

 

Found out the car will run, but I won't be able to tune it (due the the serial data signal wires being in different locations and wont line up lol). So I guess I have to find the wire from my body/interior harness and plug it in with the C220 plug?

 

Whats wrong with a 94 setup if your on budget its alot cheaper than going with a fast or ls1 setup?

 

could you post your source of info for that? im trying to understand what you are talking about.

 

Here is the information on each plug that I am referring to

http://shbox.com/1/harness_connector_faces.htm

and here is a picture of a harness (95) for reference, to show you what plugs I am talking about)

http://shbox.com/1/harness.htm



The main things I was previously talking about was plugs are the C220 and C100. Those are where I see the tuning/"serial data signal wire" issues (different locations through the 93 and 94)

 

The first link has tabs at the bottom to switch to which plug you want to look at.

 

couldn't you just get a 94 wiring harness then?

 

That's what I am planning on doing. I guess you missed my entire point. -_- (granted, I know it's not described in the clearest manner).

The only wire which I see being a problem (which I would need for tuning) is the "Serial Data Signal" wire. On the 93 car (engine/body harness), it is a tan colored wire located at connector/plug C100. In a 94 car (engine/body harness), that same tan "Serial Signal Wire" is located at connector/plug C220. So if I were to just put a 94 harness/pcm on my 93 car, whatever function the "Serial Data Signal" wire has, will not work.. and I think that's the wire I need for tuning capabilities (that connects the OBDI/diagnostic port under the steering wheel) to the PCM.

 

I just ran a serial data wire right up to the ALDL port and was done. It was many many moons ago when I did the swap ( I have FAST XFI now). I think you have to do something with the fuel pump signal wire also....I can't remember. Sorry I am not much help on it.

A 93 ICM is different than the 94-95 one. I learned the hard way.

 

i get what you are saying now sorry, but sounds like tony has the right idea for a solution. it wont be "plug and play" but doesnt seem like that big of a deal.