Fuel Delivery Issues (Beyond the Pump):
* Clogged Fuel Filter: The fuel filter could be blocked, preventing fuel from flowing to the engine even though the pump is working. This is a common and relatively inexpensive fix.
* Fuel Pressure Regulator: This regulator maintains proper fuel pressure in the fuel rail. A faulty regulator might not be delivering enough pressure, or might be leaking fuel back into the return line.
* Clogged Fuel Injectors: Clogged injectors prevent fuel from being sprayed into the cylinders. They can be cleaned, but may need replacement if severely damaged.
* Fuel Pump Issues (Despite Priming): While you hear the pump, it might not be delivering sufficient pressure or volume. The pump itself could be weakening, or there might be a problem with the pump's wiring or connections. A weak pump might prime but not provide enough pressure under load.
* Bad Fuel: Stale, contaminated, or water in the fuel tank can prevent the engine from starting.
Ignition System Problems:
* Spark Plugs/Wires: Weak or fouled spark plugs, or damaged spark plug wires can prevent a spark strong enough to ignite the fuel-air mixture.
* Distributor Cap/Rotor: These components distribute the high voltage to the spark plugs. Cracks or corrosion can cause misfires or a complete lack of spark.
* Ignition Coil: The coil provides the high voltage for the spark plugs. A faulty coil will result in no spark.
* Crankshaft Position Sensor (CKP Sensor): This sensor tells the computer the engine's rotational position. A faulty CKP sensor will prevent the computer from properly timing the spark.
* Ignition Module (ECM): The Engine Control Module (ECM) controls the entire ignition system. A faulty ECM will prevent the car from starting.
Other Possibilities:
* Security System: If your Firebird has a factory or aftermarket alarm/immobilizer system, it might be preventing the car from starting.
* Low Battery: A weak battery might not have enough power to crank the engine and start the fuel pump properly.
Troubleshooting Steps:
1. Check the fuel filter: Replace it if it's old or visibly dirty. This is the easiest and cheapest thing to try first.
2. Test fuel pressure: You'll need a fuel pressure gauge to measure the pressure at the fuel rail. This will determine if the pump is delivering adequate pressure. (Consult your repair manual for the correct specifications).
3. Inspect the spark plugs and wires: Look for cracks, corrosion, or fouling. Replace if necessary.
4. Check the distributor cap and rotor: Look for cracks or corrosion. Replace if needed.
5. Test the ignition coil: This usually requires a multimeter or a dedicated ignition coil tester.
6. Check the CKP sensor: This often involves testing the sensor's output with a multimeter or a scan tool.
7. Check for codes: Use an OBD-I scanner (if your Firebird has one) to see if there are any diagnostic trouble codes (DTCs) stored in the ECM. These codes can point to the source of the problem.
If you're not comfortable performing these checks yourself, take your Firebird to a qualified mechanic for diagnosis and repair. Trying to troubleshoot fuel system problems can be dangerous due to the flammable nature of gasoline.
