* Fuel delivery issues:
* Fuel pump: A failing fuel pump might not be able to supply enough fuel under increased engine demand (acceleration). It could be weak, clogged, or failing altogether.
* Fuel filter: A clogged fuel filter restricts fuel flow, leading to similar symptoms.
* Fuel injectors: Clogged or malfunctioning fuel injectors might not be delivering fuel efficiently, especially under load.
* Fuel pressure regulator: A faulty regulator could cause incorrect fuel pressure, starving the engine under acceleration.
* Ignition system problems:
* Distributor cap and rotor (if applicable): Cracks or corrosion in these components can interrupt the spark delivery. This is more likely in older vehicles with distributors.
* Ignition coil: A failing ignition coil won't produce the necessary spark for combustion.
* Spark plugs and wires: Worn or damaged spark plugs and wires can lead to misfires, especially under stress.
* Crankshaft Position Sensor (CKP) or Cam Position Sensor (CMP): These sensors tell the computer the engine's rotational position, crucial for timing the spark. A faulty sensor can cause the engine to shut down.
* Mass Airflow Sensor (MAF): A faulty MAF sensor provides incorrect air-fuel mixture data to the computer, leading to poor performance and potential stalling.
* Other possibilities:
* Transmission problems: While less likely to cause a complete shutdown, transmission issues *could* indirectly contribute if the engine is struggling excessively due to a transmission problem.
* Vacuum leaks: Significant vacuum leaks can disrupt engine operation, though this is more likely to cause rough running rather than a complete shutdown.
* Wiring problems: A short circuit or loose connection in the wiring harness could interrupt the fuel or ignition system.
Troubleshooting Steps (in order of least to most involved):
1. Check the obvious: Look for anything loose under the hood, especially vacuum lines. Check the fuel level.
2. Listen for the fuel pump: When you turn the ignition key to "on" (but don't start the car), you should hear the fuel pump briefly prime. If you don't hear it, the pump might be faulty.
3. Check your spark plugs and wires: Look for visible damage or wear. If you have the tools, test the spark.
4. Have a mechanic check fuel pressure: This requires a fuel pressure gauge and specialized knowledge.
5. Have a mechanic diagnose with a scan tool: A scan tool can read diagnostic trouble codes (DTCs) from the car's computer, providing valuable clues about the problem. This is usually the most efficient way to narrow down the cause.
Important Note: Without a proper diagnosis, replacing parts randomly could be expensive and ineffective. It's best to consult a qualified mechanic or use a reliable diagnostic scan tool to pinpoint the exact cause of the problem before investing in repairs.
