To most people, a computer on a car is voodoo. I'm not going to provide any direct links, Google is your friend. I see many guys trying to fix something on their car, but don't have a way to access the PCM on their car to look up codes or see what is going on with the engine. This is just a basic explanation of what is needed to get data logging on an OBD1 LT1 (1993-1995).
