New motor and PCM swap

[SS Delux]

First a little story,
Ive been needing to do the head gaskets on my 94 LT1 for pretty much the entire summer. Ive been working on getting my truck ready so that I could still have something to drive, if the gaskets ended up being more than just a weekend job. Well the truck got finished and the next day the car took a dump, find out that the starter casing broke and it wouldnt start. ( tried bump starting it but wouldnt go so I figured it is hydro-locked )
So I decide I am going to do a total rebuild and then stumble upon a 355 LT1 out of a 4th gen camaro drag car, sweet !

Here is the problem I am looking at: The motor came with a painless wiring harness that is set up with an OBDII connector and custom tune on the computer to run with the modded motor. My car is a 94 so it has an OBDI connector.

Question: Can I drop that motor in and just plug the computer into the factory harness ? add all of the smog sensors and have it run ? ( Canadian smog laws, ugh -_- )
Thanks in advance guys, cant wait to get this car up and running again.

[meissen]

Hi Aaron,

Do you know what year the 355 LT1 was in? I'm not familiar with the painless wiring harness -- does it still plug in to the stock locations? In general, a 1994 engine harness is going to have a lot of wiring differences between a 1996 (OBD2) wiring harness. You can make it work, you just have to do some changes to the wiring to get it there.

[SS Delux]

He claims the car is a 94 but doesnt have the title for it since it is a stripped out drag car. The painless harness is a complete stand alone harness and does plug into all of the stock sensors. I am leaving the 94 harness in my car and just dropping in this 355. I was just hoping that I could just swap out the pcm with the one that is tuned to that motor since it ran great already.

[hoogiesngrinderz]

What are the numbers on the standalone pcm?

[SS Delux]

there are no numbers on the pcm but i just realized that it is a pcm for less piece.

[hoogiesngrinderz]

It should have a service number on it. 94/95 were usually 16188051, 96/97 were 16214399 and 16242921.

If it has a removable memcal (chip) then it's a 93 PCM (aka ECU)

Do you see a BCC code on it at all? It will be four letters if the sticker is still on it (ie BKNF would be a 94 Camaro A4 computer) which would tell you if it is a OBDI or OBDII brain.

[SS Delux]

Unfortunately the only legible sticker is the pcm for less one. It seems to have a removeable chip.

[hoogiesngrinderz]

Is it a rectangle block or does it have fins? Have a picture?

As far as I know, the 93 ECMs will not plug and play with the 94+ harnesses. 94-97 are almost interchangeable with a few wiring mods.

[SS Delux]

Sorry it took so long, been really busy and went to get a new exhaust for a screamin deal.

[SS Delux]

Bump

[hoogiesngrinderz]

I'm willing to bet that it will be plug and play. Some called the 94-95 OBD1.5 because of the 16 pin OBD2 style connector used.

Don't quote me on this, but pre-OBD2 should have 5 to 7 pins present, OBD2 should have more.