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If the smoke from the exhaust pipe is either grey or bluish-tinged, it generally means that your engine is burning oil inside the combustion chamber. Burning oil could be due to a number of causes, from leaky valve seals to bad piston rings. take to reputable repair shop
if the engine will crank and not start, look at the exhaust while the engine is cranking. if you do not see black smoke from the exhaust pipe the engine is not getting fuel. this would be an issue with the injection pump. if there is smoke the no start is most likey a compression problem. diesel requires heat and compression to fire.
Black smoke is a sign of too much fuel. First make sure the air filter is clean. Now note if the check engine light works, and if it stays on, get the codes read to get an idea of what error the computer has found. (A bad coolant sensor for the computer can make the computer think that it's well below freezing and increase fuel) Try these as a start.
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