1. Power and Ground:
* Fuel Pump Relay: A faulty fuel pump relay will prevent power from reaching the fuel pump, and thus, no fuel will reach the injectors. Check the relay visually for damage and consider swapping it with another relay of the same amperage (a known good one) to test.
* Fuel Pump Fuse: Similar to the relay, a blown fuse will cut power to the fuel pump. Check the fuse with a multimeter.
* Power to the Injectors: Use a multimeter to test for power at the injector connectors. You'll need a wiring diagram to identify the correct wires. You should have power only *when the engine is cranking or running*. Remember safety precautions when working with electricity. *Don't test with the ignition on unless you're certain about where and how you're probing*.
* Ground Connection: Ensure a good ground connection to the engine block and the fuel injectors themselves. Corrosion can disrupt the ground. Clean any terminals or connections.
2. Injector Circuitry:
* Injector Wiring: Check the wiring harness for any damage, broken wires, or poor connections between the injectors, the engine control module (ECM), and the power source. A visual inspection is important here.
* ECM (Engine Control Module): A faulty ECM can prevent the injectors from receiving the signal to fire. This is a more difficult diagnosis and might require professional help or specialized testing equipment. Consider checking for any error codes (see below).
* Injector Driver Circuit within the ECM: The ECM has a circuit that controls the injectors; a fault here can affect one or more injectors.
* PCM (Powertrain Control Module): Some years may use a PCM instead of an ECM. The diagnosis is essentially the same.
3. Fuel Pressure:
* Fuel Pressure Regulator: A faulty regulator can cause low fuel pressure, preventing proper injector operation. You'll need a fuel pressure gauge to test this. The specifications for correct fuel pressure are in your repair manual.
* Fuel Pump: A weak or failing fuel pump may not provide sufficient pressure. Again, a fuel pressure gauge is needed.
4. Testing Fuel Injectors:
* NOID Light (No-Idling-Light): This tool can be used to test if the injectors are receiving the signal to fire. It clips onto the injector wiring and flashes when the injector receives the signal. If it doesn't flash, it points towards the ECM or injector wiring.
* Injector Resistance Test (Ohm Test): A multimeter can measure the electrical resistance of each injector. Consult a repair manual for the specifications. High or low resistance indicates a problem with the injector itself.
* Injector Flow Test (Professional): A professional shop can perform a flow test to check if the injectors are delivering the correct amount of fuel. This is the most conclusive test.
5. Diagnostic Trouble Codes (DTCs):
* Check Engine Light: If the check engine light is on, retrieve the diagnostic trouble codes (DTCs) using an OBD-I scanner (for your 1992 model). These codes can provide valuable clues to the problem.
Recommendation:
Start with the simpler checks (fuses, relays, power, ground) before moving on to more complex diagnostics (ECM, injectors themselves). A repair manual specific to your 1992 Chevy Camaro RS 3.1L is highly recommended, as it will provide wiring diagrams, specifications, and troubleshooting procedures. If you're not comfortable working on your car's electrical system, taking it to a qualified mechanic is the safest option.
