* Fuel Injectors: A faulty injector could be constantly spraying fuel, even when not needed. This is a common cause of flooding. Symptoms often include rough idling and a rich fuel smell. You might need a fuel pressure test to verify this. A leaky injector seal can also contribute.
* Fuel Pressure Regulator: This regulator maintains the correct fuel pressure in the system. If it's malfunctioning (stuck open), it could be supplying too much fuel. A pressure test is crucial here too.
* Throttle Position Sensor (TPS): The TPS tells the computer the throttle's position. A faulty TPS can send incorrect signals, leading to excessive fuel delivery. This often results in poor drivability and a rough idle.
* Mass Airflow Sensor (MAF) Sensor: The MAF sensor measures the amount of air entering the engine. A dirty or faulty MAF sensor will cause the computer to add the wrong amount of fuel, leading to a rich mixture and flooding. Cleaning the sensor (carefully, following instructions) might resolve the problem if it's dirty.
* Fuel Pump: While less likely to cause *flooding* directly, a fuel pump that's delivering too much fuel pressure could contribute to the problem. Again, a fuel pressure test is essential.
* EGR Valve: The Exhaust Gas Recirculation valve recycles exhaust gases. A stuck-open EGR valve can lean out the mixture at idle but may affect fuel delivery under acceleration.
Troubleshooting Steps:
1. Fuel Pressure Test: This is the most important step. It will tell you if your fuel pressure is within specification. You'll need a fuel pressure gauge and the correct adapter for your vehicle. This is best done by a mechanic if you're not experienced.
2. Check for Vacuum Leaks: Even though you checked hoses, ensure all vacuum lines are intact and properly connected. A small leak can disrupt the fuel/air mixture.
3. Inspect the Fuel Injectors: Visually inspect the injectors for any signs of leakage or damage. This is difficult to do without specialized tools.
4. Scan the OBD-II System (if equipped): 1994 models might have OBD-I, but a scan tool can reveal diagnostic trouble codes (DTCs) that might point to the problem.
5. Consider the Computer (ECM): While less common, a failing Engine Control Module (ECM) can cause erratic fuel delivery. This is generally diagnosed through testing other components first.
Important Note: Working with fuel systems involves flammable materials. Always disconnect the negative battery terminal before performing any work. If you're not comfortable working on fuel systems, take your car to a qualified mechanic. Ignoring the problem could lead to engine damage.
