Your '80s to early '90s General Motors (GM) OBD-1 engine doesn't run right and you can't find anyone to work on it. What do you need to diagnose and repair your engine when it won't run properly? I will explain the basic concepts using my 305 Tuned Port Injection (TPI) 3rd Gen Camaro IROC-Z. I will go though the tools and service information required to diagnose your engine, how to use that service information, and then provide some demonstrations. I discuss OBD1 scan tools, digital voltmeters (DVM), and test lights. These basic techniques apply to Chevrolet, Buick, Cadillac, Oldsmobile and Pontiac cars with 4 cylinder, 6 cylinder or V8 engines. I discuss the computer controlled carburetors with a mixture solenoid and throttle body injection (TBI), in addition to port fuel injection . I explain how the computer controlled (CCC) closed loop system uses an oxygen sensor to fine tune the fuel mixture. Each GM model will have its own specific details because they all have slightly different sensors and actuators, but the basic principles of closed loop computer controlled engines and 3 way catalytic converters are the same.
DISCLAIMER: In my videos, I provide demonstrations, suggestions, and opinions on techniques, methods, and materials for various projects. While I try to be sure that what I share is accurate, there are no guarantees, expressed or implied, that my information is correct and will work for you. If you wish to use any of this information, you must check and verify that it is appropriate for your use - use it at your risk. Do-it-yourself projects are variable and there are risks in conducting them.