if its smoking real bad then stop your engine and check your engine oil level.
Blue smoke is usually a sign that your engine is buring oil. If your engine is fitted with a turbo then this would be the first place to look for oil passing into the combustion chamber. To confirm this, stop your engine, disconnect the air intake hose into the turbo and you should be able to see the turbine inside. Check for free play by wobbling it side to side with your fingers, if its really bad you should see signs of engine oil. A worn turbo will pass oil straight into your engines combustion chamber giving you the results you have described. When fitting a new turbo, please remember to pre lube the turbine shaft before fitting.
As for injectors, you may find that that your engine is misfiring slightly. However the smoke would probably not be as thick as an oil fault. If you suspect faulty injectors, you should be able to get them reconditioned by a local specialist. If the smoke disapears after a few seconds after starting then this is either valve seals or injector leakage when the engine is stopped.
If you have an oil cooled engine then you could also have head gasket problems. I know of deutz engines that are oil cooled. When the head gasket fail on such engines, the smokescreen can be quite dramatic.
Check your turbo dude
alfie jcb technician uk, November 2009
