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Engine cranks but doesn't start.
check the crankshaft sensor
its not your ignition its your crankshaft sensor that's the same problem i had.
Crankshaft position sensor.
I say try changing out the crankshaft sensor.
If this is a Power Stroke engine, the most likely cause is a faulty crankshaft position sensor.
Some possible problems when your vehicle cranks, but won't start are a bad crankshaft position sensor, or a faulty ignition switch. Another possibility is a loose or broken wire that runs from the sensor to the PCM.
timing chain or gear is broken thats why it cranks so fast the starter is just turning the crankshaft not the cam. look or feel the rocker arms if they are not moveing its the the timing belt/chain
do you mean it cranks, but will not start?
check your battery or you spark plugs
try a new ignition coil
Have the system checked for trouble codes.