Compression Ignition Addict
Join Date: Feb 2008
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Welcome to the forum Rob!!
As said above, if you haven't seen any leaks it sounds like a HG issue.
Mine was doing the same thing with the exception that mine was puking coolant under load. After 3 trips to the dealership, a new radiator and upper and lower hoses I had a second dealership looked at the truck and they said it's a HG hands down. After it was torn down sure enough it was a blown HG on the #5 cyl. I hope yours isn't the same but it sure sounds like it.
If you want/need a good dealer to look at shoot me a PM and I'll send you the info. It's going to be a drive for you because it's just north of Atlanta but they do good work and they know their chit. If you're out of warranty I can send you the info for a shop around here that also knows their chit.
2008 F350 Lariat - 6.4L Auto, Crew Cab, DRW, long bed, 4x2 and 4.10 gears. Mods - ARP Head Studs, EGR delete, DOC/DPF delete, S&B Intake and Spartan tuning.
Last edited by Gerry; 09-24-2012 at 08:27 PM.