I just bought an LT1 that I was told was from a 95 Caprice, I check numbers and it is from a Caprice, but the computer and harness that came with the engine is what I am curious about, I was trying to find out for sure if the ecm was from a Caprice, and when I punched in the Serv. No 16214399 and the program code BSCY. I didnt get crap on google, just a single hit on a forum with a another guy asking about the same ecm and he was told it was an OBDII 96 PCM. So now I am really concerned that I dont have the right computer. Can anyone please tell me exactly what I have, here are all the numbers that were on the ecm tag:

Serv. No 16214399 BSCY
*86BSCYK15264OZR0
16229981

thanks

 

You have a 96 OBDII computer for LT1.
http://www.fuelinjection.com/portinj.html
Check out this link for info.
The 94-95 ecm part # are 16188051 & 16181333.
Either should work on OBDI 94-95 system. It's going to have a OBDII plug, but moates.net has a OBDI data cable with OBDII plug.
You probably got a 96 Caprice drive train instead of 95. You will have to find someone to edit out some stuff that has OBDII program.
Ron

 

well I went out and mocked up the harness onto the engine and I think I am going to try and find another harness and computer. The one I have has tons of extra plugs I have no idea where go and also a huge plug with a metal type retainer that must have a matching female connector which I dont have. Plus the harness has about 6 or 7 wires that are just dangling without connnectors and I know for sure that one of the connectors for the injectors is not there, just two dangling wires. The harness has the fuse box and everything so maybe I can use that for something, but the harness seems to be more of a pain that what its worth and I think I'd be better off getting another harness and ecm.

So my question is whether or not I can get another harness and ecm and use it on this motor since it was originally OBDII? OBDII is great IMO on a factory installation but its a nightmare on a swap, so I think I'd be better off staying with OBD 1 system.

At the moment it looks like I'm gonna have to buy an LT1 carb intake so I can get the motor put in and running, and then work at getting the right FI system to put in a bit later down the road. That really sucks but it looks like I dont have much choice.

 

Here is a great link to change over your OBDII harness to OBDI.
http://carputing.tripod.com/9495LT1Edit.htm

 

Can anyone tell me how the diagnostic connector is connected to the ecm? The harness I got doesnt have a diagnostic connector, but all plugs on ecm are used so where does the diagnostic connector plug in at? There is a large connector on the harness that has a funny looking metal locking type mechanism on it, is that supposed to have another harness that plugs into that. If so does anyone know where I could get one?

It looks as though I am going to keep the obd2 harness and get an obd1 ecm, but I really need the diagnostic port for tuning, and I also gotta get some connectors and repair the harness where some idiot cut off certain connectors like one of the injector connectors and a sensor on the pass side of block also has no connector. i got lots of work ahead, but I am determined to make this work becuase I dread the thought of having to run a carb on this engine. I'll try and get a pic of the big connector I am curious about later today when I get to the garage.

The one thing that would be a huge help at this point is a schematic showing the harness and exactly what each connector goes too, cause after mocking up the harness, it appears I have tons of unused connectors. and before I cut em out I wanna make sure I dont need em.

 

Tan wire off of the C100 should be the Serial data wire, only one really needed. Others would be power wire and both grounds.

 

I have no idea what your talking about...????C100????

 

The C100 plug is on the LT1 harness, big plug, has 8 wires in it, these will be your injector power, ignition power, pcm power everything to make the car run goes through this plug. Sort of like the bulkhead connector on a 3rd gen.

 

Maybe this will help.
http://shbox.com/1/4th_gen_tech1.html
http://www.impalassforum.com/
http://www.geocities.com/lt1tech/page2.html
There's more, good reading material.
Ron