I've probably spent more time reading and learning than hands-on with the truck. I believe I have it narrowed down but now the parts get a little more expensive to just start throwing at it.
2005 F-350 6.0L
275k on the odometer
Here's what I've replaced:
(Old one looked fine, screen was clean)
Picked up a ScanGaugeII to monitor and pull codes (no current codes or stored codes)
Cranks forever but does not start. Going through all the troubleshooting threads, everything looks to be in the normal range except for sync and FICM
sync. The SGII keeps reading 0 on both, neither change to 1 no matter how long I crank. I checked the resistance from the PCM
to the CKP and CMP and the CKP was way high so I replaced both sensors. Now both are in the acceptable range. I can hear the injectors cycle when I turn the key on.
If you want specific numbers I can get them - it's currently 37F out so I have the truck plugged in and warming up.
It has fuel, upper bowl fills in about 3-4 seconds
Oil filter housing fills when cranking - didn't time it but fairly quickly
Oil pressure registers on the dash after longer crank sessions
voltage 48-48.5, holds while cranking
RPM on the SGII is 160-180 and registers on the dash
High pressure oil is > 1200
If you need more information, just let me know what's missing - I'll do what I can to help you help me. I'm just not sure where to go on this. I'd like to be able to check the harness but haven't found a good pinout anywhere. I wasn't able to find any chafing or obvious breaks with a visual inspection.