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if the weather is cold enough it will have white smoke coming out the exhaust it just indicates the moisture that is the by product of combustion and as the engine gets to operating temp it should diminish. if it smells sweet it indicates that the engine is burning coolant.
Blown head gasket or cracked head. I'll guess this happened after overheating the engine. The compression of the affected cylinder will blow coolant out of the radiator and coolant in the cylinder burning shows up as white smoke in the exhaust.
sorry but if you have white smoke coming out your exhaust, most likely you blew a head gasket. antifreeze is leaking into your exhaust and out the tailpipe. check your engine oil dipstick and see if the oil is a milky color. your local auto parts store sells a temp fix for it just ask for a head gasket sealer. good luck
ur burning oil smoke from tailpipe --white /burning coolant possible blown head gasket---black /build up of carbon need tune up andadjustments---blue /engine problems-bad rings /piston-valves adjustment ,burnt,bent,buildup etc pull ur plugs out one at a time look at whick plug is oil soaked this will tell u whick cylinder(s)are bad
The white smoke is from a blown headgasket, your coolant is leaking into one or more cylinders and that's actually steam that you see coming from your tailpipe. When this happens, your coolant level drops (because it's pumping it out the tailpipe), your car overheats, and of course it will knock as it overheats. An overheated car is sluggish, as well. Another bad thing that occurs by driving a car with this problem is that the coolant is washing the oil off your cylinder walls and your rings will tear up your cylinder walls as they self-destruct. Head gasket replacement is not an easy fix nor is it cheap, and usually you'll need to get the head machined to make it perfectly straight again - heads warp from overheating. A good mechanic can do a head gasket replacement in a few hours. Overheating can cause knocking.Your best bet is to replace your motor because usually the knocking noise is caused by a spun bearing which would cost a lot to repair.
Check the freeze plugs on the engine block.
These plugs/caps can leak when it is not sit perfectly.
Is the leak from tail pipe or from the engine area?
Start monitor for coolant and oil lose and report to the engine supplier.
Can you have a friend to do a drive along to see where the white smoke is coming from?
DO NOT rule out an incorrectly install head gasket set.