* Fuel System Problems:
* Fuel Pump: A failing fuel pump might not deliver enough fuel to the engine, causing it to start and die. Listen carefully for the fuel pump whine when you turn the key to the "on" position (before cranking). A weak or absent whine suggests a problem.
* Fuel Filter: A clogged fuel filter restricts fuel flow, leading to the same problem. This is a relatively inexpensive and easy part to replace.
* Fuel Injectors: Clogged or faulty fuel injectors might not spray fuel properly. This requires more specialized diagnostic tools to check.
* Fuel Pressure Regulator: A faulty regulator can cause incorrect fuel pressure, preventing the engine from running consistently.
* Ignition System Problems:
* Crankshaft Position Sensor (CKP Sensor): This sensor tells the computer the engine's rotational position. A faulty CKP sensor prevents proper fuel and spark timing.
* Cam Position Sensor (CMP Sensor): Similar to the CKP sensor, a faulty CMP sensor can disrupt the engine's timing.
* Ignition Coil: A weak or faulty ignition coil can fail to provide sufficient spark to ignite the fuel-air mixture.
* Spark Plugs and Wires: Worn-out spark plugs or damaged ignition wires can prevent a consistent spark.
* Other Potential Issues:
* Mass Airflow Sensor (MAF Sensor): A dirty or faulty MAF sensor provides inaccurate readings to the engine computer, leading to poor fuel delivery.
* Throttle Position Sensor (TPS): A malfunctioning TPS sensor can cause the engine to stall.
* Battery and/or Alternator: A weak battery or a failing alternator can prevent sufficient power to the engine's components. Check the battery voltage with a multimeter.
* Computer/ECM Problems: While less common, a faulty engine control module (ECM) can cause erratic behavior. This is usually diagnosed by a professional with specialized equipment.
* Vacuum Leaks: Leaks in the vacuum system can disrupt fuel delivery or ignition timing.
Troubleshooting Steps:
1. Check the obvious: Ensure the battery is charged and the terminals are clean and tight.
2. Listen for the fuel pump: As mentioned above, listen for the fuel pump whine when you turn the key to "on."
3. Check the spark plugs: Inspect them for wear, fouling, or damage.
4. Check the ignition wires: Look for cracks or damage.
Professional Help:
If you're not comfortable performing these checks, it's best to take the car to a qualified mechanic. They have the tools and expertise to properly diagnose the problem and perform the necessary repairs. They can also perform diagnostic tests to isolate the fault more effectively. Simply describing the symptoms ("starts and dies immediately") to a mechanic may not be enough for a definitive diagnosis. They will need to perform tests to determine the actual cause.
