1995 Cadillac Seville how to know if injectors r not workin

Is this a 4.9L or 4.6 Northstar, and does the engine not start? The injectors would have to be stuck at 100% on to dump all the fuel in the crankcase, and this would only happen it short bursts unless it was cranked extensively. If you were to put a fuel pressure gauge on the port, and watch the pressure as it is built, does it just fall back off to zero within seconds? This would be one indication of possibly injectors leaking down, but by no means a confirmation of that. Give the symptoms of what the vehicle does or does not do. To answer your primary question, the injectors can be checked with an injector test light at an injector connector, or they can be checked with a low impedence powered test light. You can check power with a meter on the pink wires of each injector, the ecm triggers individual grounds for each injector.