* Crankshaft Position Sensor (CKP): This sensor tells the engine's computer where the crankshaft is in its rotation. A faulty CKP sensor can cause the engine to suddenly stop because the computer loses its timing reference. This is a common cause of sudden engine shutdowns.
* Cam Position Sensor (CMP): Similar to the CKP sensor, but this one monitors the camshaft. A faulty CMP sensor can lead to the same outcome – a sudden engine stall.
* Fuel Pump Relay or Fuel Pump: The fuel pump may be failing, or the relay that controls it might be malfunctioning. This would result in the engine losing its fuel supply and dying.
* Ignition Coil(s): If the ignition coils are failing, they may stop providing the spark needed to ignite the fuel-air mixture in the cylinders. This can cause the engine to cut out intermittently or completely.
* Mass Airflow Sensor (MAF): A faulty MAF sensor provides incorrect information to the engine's computer about the amount of air entering the engine. This can lead to a lean or rich fuel mixture and cause the engine to stall.
* Alternator: While less likely to cause a complete shutdown *immediately*, a failing alternator could cause the battery voltage to drop suddenly, especially if you have a high electrical load (lights, radio, etc.). A low voltage situation could trigger a safety shutdown.
* Wiring Issues: A short circuit or loose connection in the electrical system could interrupt the power supply to critical components, leading to engine failure. This is less common but hard to troubleshoot.
* Throttle Position Sensor (TPS): A faulty TPS might provide incorrect data to the computer regarding the throttle position, leading to problems with fuel delivery and engine operation. This might result in stalling, especially under certain driving conditions.
Troubleshooting Steps (with caution):
These are general observations, and attempting any of these without mechanical knowledge is dangerous:
* Check the battery terminals: Ensure they're clean and tight. A loose connection can cause intermittent problems.
* Listen for the fuel pump: When you turn the ignition key to the "on" position (but don't start the engine), you should hear the fuel pump prime for a few seconds. If you don't hear it, it could be a fuel pump or relay issue.
Important: Do *not* attempt to diagnose or repair this yourself unless you have significant mechanical experience. The problem could be something relatively simple or something complex and potentially dangerous. Get your Ford van to a qualified mechanic for diagnosis and repair.
