Slipped sleeve.. The coolant is entering the exhaust through a cylinder that has an open exhaust valve and a cylinder failure.
These are sudden failures with the exact same failure scenario that you have outlined, they generally happen to low mileage engines that would have failed under warranty if they were driven enough.
This is mode of failure #1, its the first failure we ever documented...
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Jake Raby/www.flat6innovations.com
IMS Solution/ Faultless Tool Inventor
US Patent 8,992,089 &
US Patent 9,416,697
Developer of The IMS Retrofit Procedure- M96/ M97 Specialist
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