- 1). Start the engine. Unplug each injector, one at a time. Take note of whether the engine rpm drops. If the engine rpm drops, that injector is working properly. Move on to the next injector.
- 2). Plug the noid light into the engine wiring harness side of the injector wiring harness connector if you find the engine rpm doesn't drop when you pull the connector apart. The light will blink each time the computer grounds the circuit. When the computer grounds the circuit, it opens the injector. If the light does not pulse evenly, the computer or wiring between the computer and injector is suspect. If the light pulses evenly, the injector has a problem.
- 3). Check the injectors for leaks. Look carefully at where they are seated into the intake manifold. Check for leaks at the fuel rail near the top of the injectors. If the injectors are leaking, replace the O-rings and retest. If the injector still fails the test, shut the vehicle off and replace the bad injector.
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