* Dead Battery (Despite Cranking): While a completely dead battery won't even crank, a weak battery might have enough juice to turn the engine over slowly but not enough to power the ignition system effectively.
* Bad Starter Motor (Less Likely): If the starter is failing, it might crank weakly or intermittently. But if it's cranking strongly, the starter is less likely the problem.
* Faulty Ignition System: This is a broad category encompassing several potential issues:
* Ignition Coil: This component delivers high voltage to the spark plugs. A faulty coil won't provide the spark needed for combustion.
* Spark Plugs: Worn, fouled, or damaged spark plugs can prevent a spark from reaching the combustion chamber.
* Ignition Wires (Spark Plug Wires): Damaged or corroded wires can disrupt the spark delivery.
* Crankshaft Position Sensor (CKP Sensor): This sensor tells the computer the engine's rotational position, crucial for proper ignition timing. A faulty CKP sensor prevents the engine from starting.
* Camshaft Position Sensor (CMP Sensor): Similar to the CKP sensor, but monitors the camshaft. A faulty CMP sensor will also prevent starting.
* Fuel System Problems:
* Empty Fuel Tank: The most obvious, but easily overlooked.
* Fuel Pump Failure: The fuel pump delivers fuel to the engine. A faulty pump won't provide the necessary fuel pressure.
* Clogged Fuel Filter: A clogged filter restricts fuel flow.
* Fuel Injectors: These spray fuel into the combustion chamber. Clogged or faulty injectors will prevent proper fuel delivery.
* Fuel Pressure Regulator: This regulates fuel pressure. A faulty regulator can cause low or erratic fuel pressure.
* Other Potential Issues:
* Security System Problems: An immobilizer or alarm system might be preventing the engine from starting.
* Engine Control Module (ECM) Problems: The computer that controls the engine might be malfunctioning.
* Low Compression: If the engine has low compression, it won't be able to ignite the fuel-air mixture effectively. This often points to more serious internal engine problems.
To diagnose the problem, you'll likely need to check some of these components, potentially using a multimeter or a diagnostic scanner (OBD-II reader). If you're not comfortable doing this yourself, it's best to take your car to a mechanic.
