Diesel exhaust smoke
OK so I've got a 2003 Chevy Duramax with about 135 K miles and it now has blue to dark smoke when starting or at idle. I don't see smoke at road speeds unless I really punch it. So now my question....
Forum Discussion
Don't overlook valve guide seals letting crankcase oil seep into the combustion chamber. I may be wrong in this theory applying to Diesels but that is what we look for in gas motors. I had the blue smoke coming from my gas car and replacing the valve stem seals cured it.
