Depends on the colour of the smoke .
White Exhaust Smoke consists of a large number of
particles of fuel oil larger than 1.0 microns in
diameter. This indicates that the “Fuel is not
faulty ignition pump
too high injectionpressure or faulty injection
improper grade/delivery of fuel
incorrect engine value timing
engine overheating or too cold, coolant entering
combustion chamber and/or water in fuel
high exhaust back pressure.
Blue smoke consists of a large number of fuel oil
particles about 0.5 microns in diameter or less. T
particles are recondensed droplets of unburned fuel
incompletely burned fuel. This indicates that the
engine burns excessive oil; and/or indication of
“Lubricating Oil” being burned.
engine crankcase oil level too high
wrong grade/type of fuel
oil level in air cleaner too high
air cleaner oil too light in viscosity
worn piston rings, valve guides or cylinders
Black or Gray Smoke
Black or Gray Smoke consists of particles of carbon
formed when fuel is heated in oxygen lean regions i
the combustion chamber. Part of the fuel in the
chamber is not being ignited or burned.
1) faulty injection pump timing
2) too high injection pressure or faulty
3) clogged or damaged air intake filter
4) improper grade/delivery of fuel
5) incorrect engine valve timing
6) engine overheating
7) high exhaust back pressure
8) poor cylinder compression.
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If after a oil and filter change make sure that the engine was not overfilled with oil ..
this will make it smoke also ..