Originally Posted by mjschardin
hi new to this site. recently purchaced 06 f350 with 78000 on her runs and drives great put sct tuner in it and a 4" turbo back exhaust. noticed white residue on the burp tank and after over night cool down there is pressure when you open the cap not using any coolant what do u think HG?
Well the SCT tuner is not the way to start out need gauges something like the Edge Insight CTS to check deltas on the ECT-EOT max 15* you need to know the health of the motor first plus you need a coolant filter to remove the casting sand that helps plug the oil cooler run 5-7000mi then do a coolant flush and dump the Ford Gold coolant and add some CAT EC-1 Rated coolant.
I would get a new cap for the degasing tank then park nose down hill some and pull the egr valve if damp or wet egr cooler is shot then you must change the oil cooler at the same time. Did you see any white smoke if egr valve is dry just soot then i would think HG's
Pulling and cleaning the egr valve
DTS Articles - 6.0L EGR Valve Cleaning
DTS Articles - EGR Servicing
If you need help these guys can help little raw
6.0L power stroke egr repair - YouTube