I’m pretty much at a loss as to why my expedition won’t start.

So it cranks but won’t start
i have replaced:
battery
fuel injectors
spark plugs
ignition coils
both cam shaft position sensors
crank shaft position sensor
pcm

things that i do know are:
I have spark
have fuel pressure
injectors are opening
cats aren’t clogged
fuses are good
relays are good
can’t find any broken vac lines
no codes

when it died Wife was going down hill on a high rise bridge and didn’t really noticed it had died until she lost speed and had to pull over but she said it didn’t shake or make any noises

 

If the timing chain is worn and the guides broken then the chain could've slipped off a sprocket. Test for compression.