If the truck been sitting for a while might be condensed water in catalytic u try to drive see if goes away otherwise u have coolant leak down the exhaust vaporizing cylinder head area or idle control valve if equipped controlled by coolant
SOURCE: 90 Chevy K2500 burning water (white smoke out tail
Hi: It sounds like you have a Blown Head Gasket or a Cracked Head.But I would bet that its the Head Gasket.Do this Test on your Engine. Remove all the Spark Plugs and Probally should Mark the Wires as you pull them off each Plug..FILL the Radiator ALL the way; Get your buddy or someone to Turn the Key Like Trying to Start it. You need to be Watching where the Plugs came out and Look to See if Your Getting Water And Coolant Out of Any of the Spark Plug Holes. This will Comfirm you have a Blown Head Gasket. Do Both Sides on Both Heads .Also have your Heads Magnafluxed, And Have Them Checked for Warpage.Hope this helped you. Please Reply so I'll know what you found. Vote For my Solutions. Ratings are 1-4, 1 Being the lowest score and 4 being the Highest. Thank You: The WYOCWBOY
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