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Hello, on this engine it is usually caused by a failing glow plug module. Without working glow plugs the vehicle doesn't start well when cold.
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On the 6.0l engine usually when it wont start cold it is a failed FICM module, a scan tool hooked up to check the FICM_MPWR reading will check this, it needs to be 45volts or more to start, a new module can now be bought preprogrammed.