Where are injectors relay located in an 1989 caprice?
I don't beleve that there is a relay for the injectors. The system has a fuse. If you use a test light check to see if you have 12v on one side of the plug. If so your problem is with the pcm. Injectors are controlled by ground pulses from the computer.
I just changed the fuel pump relay on my 1992 Chevy Caprice. I found it on the driver's side fender well bracket. There were two relays mounted on the bracket, the one closest to the engine was the fuel pump relay. It was square, made by Bosch. Also I found out that you can go to your local Chevy service department. They will show you on a computer screen where to find parts like this.