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Custom tune = coolant puke, stock tune = no puke
Ok guys, here's a good riddle for ya.
Back in November of last year I did the big upgrade on my Powerstroke. Did everything short of new head studs: SCT tuner and loaded the custom tunes from Innovative, EGR delete, oil cooler replace, new radiator cap, and 4" exhaust, etc. Results were great. However, now we are having issues with our coolant puking out of the degas tank. I know, you jump to the conclusion that its our head gaskets, but bare with me for a second. I performed this simple test:
- Installed coolant pressure gauge
- Truck is F-350, crew cab, dually, towing 26' enclosed trailer roughly empty
- Identified good stretch of road with slight hills, able to get up to ~70mph, ran it as hard as I could
- With tow tune in truck -> coolant pressure got up to ~17psi, boost maxed out ~27psi, coolant puked
- Refilled coolant and returned tune to stock -> coolant pressure only gets up to ~5psi, boost easily pegs 30psi, no coolant puke
- ECT and EOT delta never got above 12°F
From this data, to me, it doesn't appear to be a head gasket at all, however, I have no clue what it could be. One other observation is that until now, it has been cooler temperatures, but now we are getting into the summer months (we are in Auburn, Al). If you have other tests we could run or anything at all that might help, it would be greatly appreciated. Anyone ever seen anything like this?