Ok, it might be on ALL 3rd gens, but it might also only be on 90-92s.

Anyway, I made a mount for the LT1 PCM so that I could put it inside the dash like the factory piece. While I was getting it in there I removed a black box that encases a small circuit board with a plug that connects to the bottom.

Can anyone tell me what it is or what it does?

 

ITS A BOMB!!!!!!!!!! IS IT TICKING LOL!!!!!!!!!

 

It's probably something like the open-door dinger, or 'key-is-still-in-the-ignition' buzzer, or the like.

 

I believe that box has something to do with the cruise control. Taking it out would cause the cruise control not to function.

 

If it's part of the cruise control then I'm all set since that is history too.

Guess I'll find out when I start the car over the weekend

 

Why wait, take it out for a cruize. I would be curious just to know.

 

Can't yet. The car has been down for work for maybe 3 months now. I did the airbox and removed the AC first. Then replaced header gaskets, installed CSI pump, new opti-spark, painted and cleaned up everything under the engine bay, redid the fuel lines, swapped up to 42# injectors, and have essentially rewired the entire engine bay. Lot of hours of labor just to get it to look cleaner. But the results are well worth it.

Right now I just have to figure out where to put the new PS reservoir, run a vacuum line to the brake cylinder, and wait for pcmforless.com to send me a new program that I ordered.

I hope to be driving again.....Friday?

Here's some info on the box if anyone is feeling entrepreneurial...

On one side it has AC emblazoned on it. I would assume for AC Delco. On the other side there is a tag with a part number that no longer references. 25110869 and underneath that in large font is 37FB. The connector on the car that goes to the box should have 6 wires I am guessing (haven't looked under the dash again in a while) They are arranged together 4 and 2.

 

No other guesses?

 

It could be the Buffer for your electric speedo. I'm not sure about a black box but mine is yellow. It has a chip in it and it goes to the ECM.

 

I'm tellin you man, ITS A BOMB!!!!!!! RUN!!! LOL!!!

 

Does it have any sort of Part number on it???? If so, just call a chevrolet dealer and give them the number, and they will tell you what it is. I did this on an escort one time, because I didn't know what a bad part was. Good luck

 

I agree