I have a 94 Camaro, before you answer, the previous own changed it to a LT1 drive train. The block serial number is a 95, and it has AL heads, is there a number someplace on the computer to check and see if its OBDI or II? The data port inside is a OBDII which would go along with the 95 year model, OBDI with II contector, but i don't want to take anything for granted before i order my tuner cables and kit...that guy did a number on this car so who knows where he got everything. Is the outside different or a serial number on it sompelace?

thanks

 

So it was a '94 v6 car with a '95 LT1 swap correct?
I don't know of any numbers to designate a OBD1 or OBD2 PCM's, but I'd like to know if there is one as well.
One way to test would be to hook up a OBD2 scanner and see if you can read codes. If not check the cigar fuse. If you still can't pull codes, get a hold of a OBD1 scanner and do this:

http://shbox.com/1/xraycable.jpg

 

also a pcm looks way different than an ecm. ecm is only one section, while the pcm has two sections to it.

 

Look on your computer and see if you can find any of these service numbers:

93=16159278 OBDI
94=16188051 OBDI
95=16188051 OBDI
96=16214399 OBDII
97=16242921 OBDII

 

As always, you're the man.

 

I forgot to mention the engine is out right now and nothing is powered up.

Shbox, i will check those numbers when i get home, thanks. I love your site, i visit it regularly for help of all kinds, thanks for that.

 

I don't know for sure but I believe I have heard that '96 F-bodies had an OBD-I port with OBDII PCM, b/c this the akward transition interface...Is there any possible way the donor was from this yr?? Keep in mind '96 GM cars were produced in August of '95-...

 

You heard wrong. What you probably mean is 95s were OBD-I with an OBD-II shaped DLC. The OP had all the correct info.

 

ok...thanks for keepin me in check! lol

 

I looked all over that thing and there isn't a number on it. It did have "Delco electonics" on one side. I'm guessing its a remanufatured computer, there was no part number on it so i don't know how to figure OBDI or II

 

Does the motor have a crank sensor? If not it's an OBD 1. I havent heard of a 95 OBD 2 F-body yet.

 

It should be an OBD I car. Only a few manufacturers participated in early change-overs to OBD II (1996 to date). A few honda models snuck out as OBD II cars in late 1995. As a rule though, its 1995 and older for OBD I. OBD-0 as its sometimes called was a 1991 and earlier type thing.

 

Also, i just noticed that the car is a 1994 chassis. Usually the motor swapped in must be of the same vintage as the chassis to avoid a PITA wiring issue. That said they do make painless style wiring harnesses for I-II conversions. But I still say its OBD I considering they only made the LT1 OBD-II for a year.

 

I'm not sure what the LT1 crank sensor looks like, since I've rebuilt the motor, i'm pretty sure it doesn't have a crank sensor, just a optispark. But again i don't know what it looks like. I'll have to cral under my 96 TA and look at the crank area to get an idea what one looks like.

 

96 and 97 were both obdII with the obdII connecter

 

The sensor is in the lower front cover on the passenger side. If you did the motor do you remember putting a little extra wheel in front of the bottom timing sprocket behind the timing cover?

 

no, it looked like a Gen I SBC but had the water pump drive. guess its a OBDI then.