I have a 94 Z28. I'm putting in a 96 LT1 with a 96 engine harness and planning to use my 94 PCM. Any major complications? From what I've read, I should be good, but I'm thinking at the very least, I'll need to do something with the 02 sensors.

 

The problem may be interfacing the 96 engine harness to the 94 chassis connectors. The pinouts are different. Shoebox has a guide to the pinouts for the various body connectors, by year:

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

The individual connectors are on tabs at the bottom of the page. Compare 94 to 96 for some differences. Note that on the connector with the fan wiring, use 94 if you have 2 fan relays (early 94 production), and 95 if you have 3 fan relays (late 94 production)

You wouldn't change anything related to the O2 sensors. The fact the 96 harness has connectors for the two after-cat sensors used in OBD-II simply means you don't have anything to plug those connectors into.

You will need to use your 94 knock sensor in place of the 96 knock sensor

Seems like it would be easier to use the 94 harness.

 

Thanks! Yes, I agree. Unfortunately my friend decided to hack it apart when he was "storing" the car for me.

 

If it makes any difference, I also have the PCM from the 96, but the car was automatic. Should I reprogram and use that computer?

 

You'll just be adding OBD-II complications by using the 96 PCM, and will gain nothing. More programming needed to delete diagnostics, have to add after-cat O2 sensors, or sims, or have the after-cat sensors programmed out, expensive tuning software, etc.

That will not solve the main problem, which is the chassis connectors.

 

Well, that brings up a good point. The car is a track car and I'm putting in a painless kit to run everything else. So all of those connections on C105 sound like they're long gone.