Ford Truck Enthusiasts Forums - View Single Post - Possible blown HG, need help to diagnose.
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Old 07-15-2014, 07:38 PM
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After the truck sits overnight, pull the drain plug carefully and see if water comes out before oil. How fast does your water level drop?

The knock could be an injector, but if it has had a lot of water in it you could have also wiped a bearing or more out. Headgasket failure on a stock truck is not very common, but anything can happen.
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