Wayne (NSW) replied:

Jambobwana,

This is a very common with Patrols and other vehicles that may have a few k's on the clock.

If it is blue/white smoke that would be oil. Over night oil would have run down the side of the bore and when the motor is stared the oil is burnt off.

The fix would be to replace the rings and hone the bore, but until the compression gets really low it would not be worth the expense.

If the smoke was black that would be fuel and that could be a leaking injector.

Wayne

traveller2 replied:

A puf of blue smoke on startup can also be unburnt diesel due to a dead glowplug as the fuel in the affected cylinder will not be burnt correctly.
Relatively easy to check the glowplugs, remove the busbar connecting them all, test each one with a test lamp or multimeter connected to the battery. The one (or more)that shows no lamp or reading on the meter is 'kangaroo edward' as they say. You will probably find as the weather warms up that it becomes less of a problem which will become more pronounced at the onset of winter.

Tanka replied:

G'day,
Does the truck use oil excessively??? Generally diesel smoke falls into 3 categories.

1- White Smoke - Poor heat in cylinder, Lack of compression.
2- Blue Smoke - Oil burning, caused by cylinder blow-by, leaking valve stem seals, Leaking turbo seals etc.
3- Black Smoke - Overfueling, caused by leaking injectors, incorrectly timed or adjusted fuel pump etc.

If the truck is not using oil, the first thing I would check is mentioned above (Glowplugs). If these test OK you should get a compression test.

Tanka.

WheelTravel replied:

Could be as simple as your air filter needs replacing. The smoke you are describing is definately unburnt diesel. If there isn't enuf oxygen getting in... then this is exactly what happens/