Fuel System Problems:
* Fuel Injector Issues: A stuck-open fuel injector is the most likely culprit. One injector continuously spraying fuel into the cylinder will overwhelm the engine's ability to ignite it all, leading to raw fuel washing into the oil pan. This is often accompanied by a rough running engine before it completely floods out. Faulty injector seals can also contribute.
* Fuel Pressure Regulator: A malfunctioning fuel pressure regulator could maintain excessively high fuel pressure, causing injectors to over-deliver fuel.
* Fuel Pump Problems: While less likely to directly cause flooding, a faulty fuel pump might be delivering more fuel than the system can handle under certain conditions (though this would usually manifest as other issues alongside flooding).
* Leaking Injectors or Lines: A leak anywhere in the fuel system, before or after the injectors, can lead to excess fuel pooling in the engine compartment or even making its way into the cylinders.
* Computer/ECU Problems: The Engine Control Unit (ECU) governs fuel delivery. A malfunctioning ECU could send incorrect signals to the injectors, leading to excessive fuel injection. This is less common than mechanical problems.
Other Potential Causes:
* Crankshaft Position Sensor (CKP) Issues: A faulty CKP sensor can cause the ECU to not accurately time the ignition and fuel injection. This could lead to incomplete combustion and an eventual build-up of unburnt fuel that might manifest as flooding if severe enough.
* Throttle Position Sensor (TPS) Problems: A bad TPS could send wrong signals regarding throttle position, leading to improper fuel delivery and a rich mixture.
* Airflow Sensor (MAF) Issues: A malfunctioning mass airflow sensor can cause the ECU to inject the wrong amount of fuel. A faulty MAF sensor will usually cause a rich condition eventually leading to flooding.
* Ignition System Malfunction: While not directly causing flooding, a weak or failing ignition system (spark plugs, wires, coil) can lead to incomplete combustion. This doesn't directly *cause* flooding in the same way as an injector issue, but unburnt fuel will eventually accumulate to the point where the engine struggles to start.
Important Note: A vehicle flooding repeatedly usually indicates a serious problem requiring professional diagnosis. Attempting to start a flooded engine repeatedly can cause severe damage, including hydrolock (liquid in the cylinders). It is best to have the vehicle towed to a mechanic or a qualified automotive technician for proper diagnosis and repair. They possess specialized tools and experience to safely diagnose the specific problem.
