Why 06 6.0 spins over wont crank

Ford had a lot of problems with this engine. Most diagnosis requires a factory software scanner or one that can interface with the FICM module (fuel injector control module) Now you can perform injector buzz test and glow plug tests. If you can get running then also do a power balance test these test check fuel injectors statically and dynamically with the common rail oil pressure control sensor. These FICM modules are famous failure parts. Napa auto can get them.

Do you have access to a scanner?
How did you check your FICM? Does it have 48 Volts?
If you have a scanner, does the computer show RPM? If not it could be the crank sensor.
Is the Crank Sensor and Camshaft Sensor in SYNC with one another?
When cranking does the desired IPC read at least 500PSI? The list goes on and on. Check to to see if the 30amp fuse for the fuel heater isn't blown. They are known to short out? Do you have fuel in the filter housing? The pump might have died. Unless you have a scanner, your at a stand still. Just don't start throwing parts on it.

check the crank position sensor

Check for fuel pressure at the primary fuel filter. there if you move the plug for the fan clutch you can see an auxillary plug on the filter housing facing forward and to the driver side. You should have 40+psi with key on. another way to check the pump is to listen for it to cycle on for 10 seconds or so after key on. Also check for lubricating oil pressure on the cluster gauge and then high pressure oil with a manual gauge. its needs to see around 600psi oil pressure to signal the injectors to fire. best way to check all of these is with a scanner that has data reading, which will also tell you if you have a bad ficm, ecm or sensor connection.

wow....the sky is the limit here....i LOVE the 6.0, it pays my bills :)....with that said..there are many possiblities, almost too numerous to speak of...first, i assume you can hear the fuel pump?..try opening the upper fuel filter housing and turning on the ignition key, if filter bowl fills, good!...when you crank it, is it cranking above 500 rpm? thats the minimum needed to start, make sure batteries are strong. when cranking, can you see the oil presure guage rise? does it have the right oil in it? your fuel injectors are driven by high presure oil, without base pressure (what your dash guage would read) the high pressure system has no oil to drive injectors "power stroke". if you have base pressure you really need to have a computer on it to monitor high presure oil when cranking, will need 500 psi just to fier then would jump up from there...it is also possible the FICM, or fuel injection control module has failed..this too needs to be tested with computer, needs to read internal voltages to make sure has45 volts..now the ficm may be covered under emission waranties still...that truck did come with a 5 year 100,000 mile warranty on engine and some componetns are 6 years, based on state sold in...back to the high pressure oil system, in 06 the vehicle had awhat called a snap to connect fitting, or STC. that connects the high p[ressure oil pump to the branch tubes that supply oil to the injectors..that too can seperate with age and cause a no start...it would be in your best interest after chdecking the basics to see you dealer...in comparison the initial diagnosis would be cheap (in comparison) and effective if trying to repair on your own...it will save you much hair on your head!! good luck, hope this helps you...very hard if not impossible to diagnose these without compuiter on it!

why was injector module replaced and has the high pressure oil system been checked unless 500psi. minimum is seen it will not start the high pressure pump is located at rear of the valley under turbo pedestal

it was you ficm . i know because it happend to me . get a used ficm of ebay and your truck will strart right up . also on the e series it is located on the left fender , not the valve cover

check all your conection one may have come off
xxx IPR xxx under turbo also check computer plug in
hard to connect properly bad location if all this check out
get injection oil pressure look at requires 500psi to start

sorry to say ur high pressure oil pump is going bad!

with proper scan tool check FICM fuel injector control module main power should be 47 volts key on engine off 47.5 engine running if not replace FICM it has an internal problem also there may be a reflash available for drivability issues at the ford dealer this is not uncommon for 2004-2006 6.0s. keep me posted goodluck!