Compression Ignition Addict
Join Date: Jun 2011
Location: Colorado Springs
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Leaking head gaskets do not blow white smoke. Cylinder pressure forces exhaust through the bad head gasket, pressurizes the coolant, and forces the coolant out the cap. The other cause for white smoke (caused by coolant) is a leaking EGR cooler, but you have a EGR delete.
Are you sure the white smoke is coolant? Does it smell sweet?
Milky stuff in the valve cover makes me think your oil cooler is leaking coolant into the oil, but that (I don't think) would give you white smoke from the exhaust. How is your oil level? Are you gaining oil (i.e. coolant in the crankcase?)
2005 F-250 6.0L, crew cab, long bed 4x4
completed in 2011: STC update, new IPR, BPD EGR cooler, oil cooler rebuild, 6.4 banjo bolts, blue spring update, SCT X3, Insight CTS, 58V FICM, CCV Mod, DIY coolant filter (now gone), refinished turbo
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2012: ARP headstuds, OEM gaskets, standpipes and dummy plugs
2015: XDP coolant filter