Got a 1999 Cadillac Deville from a friend. Changed fuel pump , water pump , thermostat , alternator and now it's putting out white smoke from the tail pipe. Does anyone know what this might be? Thanks for any help, I'm about ready to give up !!!
Sounds like a blown head gasket.
Check for coolant lose. Also a pressure test on the cooling system with the spark plugs out will confirm if this is your issue. Some auto parts stores will loan you the test equipment.
Those Northstar engines are notorious for head gasket failure! HTH. -Jim
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