The smoke emitting from my TLC BJ40 diesel is colored blue not black is this normal

Is your vehicle a petrol or a diesel? Black smoke is a sign your engine is burning a fuel mixture that is too rich, (Too much fuel, not enough air). Start by replacing the AIR filter. After that you need to get the fuel injectors checked. If yours is a diesel have the EGR valve checked as a sticky valve isn't diverting unburnt fuel back through the fuel system.

Depends on the colour of the smoke.
Unlikely an engine will sound healthy emitting black smoke - excess fuel.

An engine could sound healthy emitting white smoke (steam from coolant) but not from white smoke (excess unburned diesel).

Most engines emitting blue or blue-grey smoke from burning engine oil can sound very healthy.

What color is the smoke ? Black smoke Check the air filter for plugging. Blue smoke, could be burning oil white smoke, could be coolant leak into the combustion chamber, or blown head gasket or cracked head

Oil smoke is blue, white smoke is condensation and emits steam on a cold morning, will disappear at operating temp If your car is a diesel, white smoke indicates unburnt fuel

TELL ME COLOR SMOKE YOU SEE, BLUE SMOKE ENGINE BURNING OIL, WHITE SMOKE FUEL INJECTION TIMING OFF OR BLOWN HEAD GASKET,BLACK SMOKE YOU HAVE RESTRICTED AIR FLOW DUE TO STOPPED UP AIR FILTER.

HI do you now the color of the smoke
if engine emits white smoke its not burning the fuel
it could be water mixing with fuel = head gasket even tho you
dot have water in the oil
if engine emits black smoke - that's excessive fuel to air ration
check air filter & air inlet to see if clogged
if engine emits blue smoke - excessive oil consumption
cloud be valve seals

The three most common colors of smoke that can be emitted from the engine and billow from the tailpipe are as follows:
1. White
2.Black
3.Blue..

Each one has its own cause and its meaning .Kindly let us know what color smoke are you getting.

what color smoke ---color decoding white misty in beginning of start up is condensation in exhaust burning out --white billowy when driving even after warm most likely head gasket blown burning anti freeze if level low in tank/radiator also indicator ----black carbon build up needs tune up and some engine tlc -------blue burning oil internal engine problem/damage component[s]

When an engine expels black smoke it means that the piston rings are going and is consuming oil. And when the color of smoke is white the engine is consuming more fuel. Both are harmful. Black to the engine and pocket while white to the pocket. It seems that the injector need careful attention.
Cold engine does expel white smoke initially. When the temperature rises to normal working temperature the smoke stops. This is normal in your case. 5 to 10 minutes to warm up is normal for any diesel engine. But any thing more than that needs attention.

THER ARE THREE COLORS OF SMOKE. WHITE IS WATER, BLUE BURNING OIL, BLACK RUNNING RICH.CHECK COOLANT LEVEL AND DO A BLOCK TEST. HOPE THIS WILL HELP YOU SOLVE YOUR PROBLEM.