How do you trace down a dead fuel injector on a 1991 Chevrolet caprice?

Answer 1

The 91 Caprice is throttle body injected and has 2 fuel injectors mounted above a Rochester throttle body. The easiest way to check for an injector that is not working correctly is to remove the air cleaner assembly, start the car and visually inspect the base of the injectors for a smooth consistent spray pattern. If the pattern is absent or intermittent on both injectors it may indicate a problem elsewhere, the ECM or a maybe a wiring issue or sensor. If it is a single injector that is acting up it could be the injector or a wiring problem to that injector which could be tested with a multimeter.