Most Likely Causes:
* Dead Battery: This is the most common cause. If the alternator failed while driving, the battery would have drained, preventing the car from restarting. Check the battery terminals for corrosion and try jump-starting the vehicle. If it starts and dies again soon after disconnecting the jumper cables, the alternator is likely the culprit.
* Alternator Failure: As mentioned above, a failing alternator won't recharge the battery. This is especially suspect if the car died while driving. Testing the alternator's output voltage is necessary to confirm this.
* Fuel Pump/Fuel Delivery Issue: The fuel pump might have failed, or there could be a blockage in the fuel line preventing fuel from reaching the engine. This could cause the engine to stall and refuse to restart.
* Crankshaft Position Sensor (CKP) or Cam Position Sensor (CMP): These sensors are crucial for the engine's timing. A faulty sensor can prevent the engine from starting.
Less Likely, But Possible Causes:
* Ignition Switch: A malfunctioning ignition switch could prevent the engine from receiving power.
* Starter Motor: While less common to cause a sudden stall while driving, a failing starter motor could prevent the engine from cranking.
* Fuses/Relays: A blown fuse or a faulty relay related to the fuel pump, ignition system, or other essential components could be the problem.
* Security System: If the vehicle has an aftermarket or factory alarm/immobilizer system, a problem with it could prevent the engine from starting.
Troubleshooting Steps:
1. Check the Battery: Inspect the terminals for corrosion. Use a voltmeter to check the battery voltage. A reading below 12 volts indicates a low charge. Try jump-starting the vehicle.
2. Check the Alternator: If the car starts with a jump but dies shortly after disconnecting the jumper cables, the alternator is likely the problem. Have it tested at an auto parts store or mechanic.
3. Listen for the Fuel Pump: When you turn the ignition key to the "on" position (before cranking), you should hear a brief humming sound from the fuel pump (usually located near the fuel tank). If you don't hear it, there could be a fuel pump or fuel delivery issue.
4. Check Fuses and Relays: Consult your owner's manual to locate the fuse box and relay panel. Visually inspect the fuses for blown elements.
5. Have it Professionally Diagnosed: If you're not comfortable troubleshooting these issues yourself, take your Windstar to a qualified mechanic for diagnosis and repair. They have specialized tools and expertise to pinpoint the exact problem quickly.
Without more information (e.g., any warning lights on the dashboard before the car stalled, any unusual sounds before or after the stall), it's impossible to give a definitive answer. The troubleshooting steps above will help narrow down the possibilities.
