Follow up to Stephen, checked, no spark, but what would have spark then not at times?

Is it not getting spark at all ? If it is getting spark have you sprayed a shot of carb cleaner into throttle body to see if it's fuel related . Can you hear the pump when initially turning key on ? Fuel pressure at Schrader valve ?

Pull the spark plugs out and check that they are not burned , also check the gap..and if your car has close to 100k miles just replace them all.. one at the time so you don't put the cables in the wrong order.

Visit the on-line store, known as reliable-store, they have the repair manuals. I'm sure you will get the solution of your problem.
2003 Ford Expedition

Which engine? What have you done for maintenance? Last time spark plugs replaced? Only when cold or happens when warm too?

You must check the spark plugs gap and also the spark plug wires or coil on plug boots for cracks if all well look at the vacuum lines if ok the idle air control valve maybe very old or a dead spot in the throttle position sensor you must be in another country I'm in the USA and don't have a listing for a laser so I'm trying to guess what the ignition system is that's why I mentioned both above out of gap plugs is the first check here then go further good luck stephen

how many miles? could be a timing belt has jumped or broken does it turn over fast.

I am assuming the engine does crank.
Have you checked base fuel pressure with a gauge ?

Hi Stephen, Have a look an see if this helps!! https://www.youtube.com/watch?v=Pv6wqQAmXvc Best of luck. Cheers Greg.

here's another Stephen to help you the first one is correct and after you do these things suggested by Stephen also since you have a volt meter check your cables first then go to the starter and see if you have voltage going in if you do the solenoid on the starter has gone to the great fried starter heaven in the sky change the starter motor

here are some pictures to help you good luck to you and way to go Stephen from Stephen

Check out all info on Edmunds.com There should be a detailed list if you wanna go by the book. If youre wanting to keep it simple just do the major items

Replace trans fluid and filter
Have gear oil checked in rear-end and transfer case
oil change (preferred synthetic and performance filter)
air filter (high performace)
spark plugs and wires
have ball joints and u-joints checked and entire undercarriage greased
change all o2 sensors (helps with mpg)

That should be penty good enough for another 20k miles before major check up. Stephen