Simple Checks (Things you can do yourself):
* Fuel: Is the fuel gauge showing empty or near empty? Try adding some gas. A completely empty tank can sometimes cause this.
* Battery: Check the battery terminals for corrosion. Clean them with a wire brush if needed. If the battery is old or weak, it might not have enough power to keep the engine running. Try jump-starting the car (with caution and proper procedure). A weak battery can also cause starting problems.
* Alternator: While the battery starts the engine, the alternator keeps it running. A failing alternator won't recharge the battery, leading to immediate shutdowns. You might notice dim headlights or other electrical issues if this is the case. This is more likely if the car runs for a few seconds before shutting down.
* Ignition Switch: A faulty ignition switch might not be supplying consistent power. This is less common but possible.
* Loose Connections: Check all wiring connections, particularly those related to the battery, starter, and alternator. A loose connection can interrupt the power flow.
* Cranking Speed: Does the engine crank slowly or quickly when you turn the key? A slow crank indicates a weak battery or starter motor problem. A quick crank suggests the problem lies elsewhere.
More Complex Issues (Likely require a mechanic):
* Fuel Pump: The fuel pump delivers fuel to the engine. A faulty pump might not supply enough fuel, causing the engine to stall immediately.
* Fuel Filter: A clogged fuel filter can restrict fuel flow.
* Crankshaft Position Sensor (CKP): This sensor tells the engine's computer where the crankshaft is. A faulty CKP sensor can prevent the engine from running consistently.
* Cam Position Sensor (CMP): Similar to the CKP sensor, a faulty CMP sensor can cause the engine to shut off immediately.
* Mass Airflow Sensor (MAF): This sensor measures the amount of air entering the engine. A faulty MAF sensor can lead to incorrect fuel mixture and stalling.
* Throttle Position Sensor (TPS): This sensor tells the engine's computer the position of the throttle. A faulty TPS can cause erratic idling and stalling.
* Engine Control Module (ECM) / Computer: While less common, a problem with the engine's computer can cause various issues, including immediate shutdowns.
* Immobilizer System: If your car has an immobilizer, a problem with the system (key, transponder, or the immobilizer itself) could prevent the engine from running.
Troubleshooting Steps:
1. Start with the simple checks. These are the easiest and cheapest to address.
2. Listen for unusual sounds: Any unusual noises (clicking, grinding, whirring) during cranking or immediately after starting can provide clues.
3. Check engine light: Is the "check engine" light illuminated? If so, have the codes read at an auto parts store (often free) or a mechanic. This will pinpoint the possible problem.
4. If you're not comfortable working on your car, take it to a qualified mechanic. They have the tools and expertise to diagnose the problem accurately.
Providing more details about your car (make, model, year) and any additional symptoms (sounds, smells, lights) will help in narrowing down the possibilities.
