What could be causing thick exhaust smoke from my 2003 Nissan X-Trail
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Asked by Richard
What causes thick exhaust smoke from my 2003 Nissan X-Trail? It appears on first start and disappears after a minute.
Answered by CarsGuide
6 Feb 2024You can tell a lot about exhaust smoke by its colour. If it's a blue-grey colour, the smoke is probably from burnt oil. If it's black, excess fuel is probably the cause. Make sure, too, that what you're seeing is not just water vapour that is a normal part of the combustion process and will disappear as the exhaust system heats up and turns that vapour into steam (which is invisible).
But if it really is blue smoke you're seeing, it could be a case of worn out piston rings, or worn valve guides or seals. If it's black smoke, you could have a problem with injectors, the fuel pump, intake system, spark plugs, any number of sensors that control the engine's fuel:air mixture, or about a thousand other things. That fact that the smoke disappears after a while suggests that the engine is happier when it has some heat in it, but really, it shouldn't blow any smoke of any colour at all.
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