Diesel engines that emit white smoke could have a problem with the injectors, or the engine is burning coolant and may have a leak in the head gasket. White smoke indicates unburned diesel is exiting the tailpipe, and you should be careful not to come into contact with the smoke as it will irritate the eyes and skin.
Sometimes, it’s pretty standard for diesel engines to emit white smoke upon starting in chilly weather due to condensation. But if the smoke doesn’t vanish even after the engine is warm, it could point to damaged or inefficient fuel injectors, wrong injection timing, low compression, problems with the timing gear, a failing fuel pump, or issues with the cylinder head or a leaking head gasket.
Again, an occasional exhale of white or black smoke when accelerating hard is acceptable. But if the smoke is relentless (especially during idling), it’s best to take your vehicle to a mechanic for a thorough diagnosis.
