Why did my engine shut off with no warning
What would cause a 98 expedition to just shut down with no warning, and then not start?
The two main reasons for your truck to just stop are
1. Lose of fuel, Cause : plugged fuel filter ,bad fuel pump break in fuel line, lose of power to the injectors .
2. Lose of spark Cause: coil failure, battery failure ,alternator failure, wiring failure ECM failure
If you want me to be more specific then I need more information on what happened and what the truck is doing when you try to start it
Is there any clicking that indicates that the starter motor is turning or is it dead silent? If it is dead silent, then you may want to have a technician inspect/replace the starter motor brushes. If there is the starter motor clicking, your battery may be dead.