Re: computer ?
I just put a Hypertech ThemoMaster chip in my 93 4.3 TBI, the chip installed onto the factory chip under the passenger side dash. I also have that thin black box in the engine and was wondering what it was. I know the adapter under the steering wheel is to connect to the computer for service but I don't know about the other box. I hope I got the correct chip, it works with no problems but I didn't feel much of a difference. Any ideas?