Hard to start

[jdoddharm]

I have a 2006 6.0 super duty, the last 2 days it has been cold and I can barely get this truck to start, any suggestions?

[Herb]

This could be due to gelling of the fuel, formation of ice in the fuel tanks or lines or poor fuel quality. Try using a fuel conditioner, (anti-gell/cetane boost), that will improve the cetane level and lower the gell point of the fuel, if you are not all ready doing so.

[Garfield78]

What was the air temp? Did you try the block heater? May be glow plug or intake heater problem. I don't remember what Ford has for starting, glow plugs or intake heater. Have you got synthetic engine oil in the engine? That sure helps in start ups. It will turn over alot easier. I had two batteries go bad on my D/A when it was 2 yrs old. The charging was fine.
Good Luck: Ralph

[jdoddharm]

It was around 30deg. I just started putting power service additive in the fuel, when I would crank it the engine would run for about 2 sec. and die then I would crank it again and it would do the same thing until finally it started and it knocked and rattled really bad and had no throttle response, then finally it cleared up and ran fine, I have noticed lately that when the engine is cold it runs real rough, that is part of the reason why I started adding the power service additive to my fuel.