White smoke on start up

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Smell the WHITE EXHAUST.. Does it smell like Coolant? You have a blown Head Gasket

You probably have oil that spilled over onto the engine block and manifolds which is burning off while you drive. You could get some degreaser and clean the engine. You could also just keep driving it untill it stops smoking as long as it seems to be running OK.

When you stop at the traffic lights and then drive off and you get blue white smoke then you have either worn piston rings or worn valve guides where oil is getting into the combustion chamber.

It does sound like a bad head gasket. Did you vehicle overheat recently? Usualy there is a reason the head gasket goes out. Check to see if your low on coolant too. It probably isn't too bad yet because it stopped blowing white smoke but I wouldnt drive it anymore. Coolant will ruin the pistons and sleeves if you keep driving it. Hope this helps and if you need any help with anything, feel free to ask.

A LOT OF WHITE BLUISH SMOKE ON START UP.VALVE SEALS LEAKING OIL AND OIL RETURN HOLES COULD BE STOPPED UP CAUSING OIL POOLING UNDER THE VALVE COVER OIL LEAKING DOWN BY VALVE SPRINGS AND VALVE SEALS CAUSING ENGINE TO SMOKE A LOT.CHECK A SPARK PLUG SEE IF ITS OIL SOAKED.

Black smoke is a sign of an overly rich fuel/air mixture. White smoke is a sign of coolant entering the combustion chamber. Most likely you have a blown head gasket. Other symptoms are loss of coolant with no apparent leak, loss of power, miss, oil level overfull, a white foamy substance on the underside of the oil fill cap. Stop driving this truck until you find the problem. Driving it with a blown head gasket will destroy the engine. A compression test will verify this.

Water vapor coming out of the exhaust at initial start-up is normal; that is condensation that collects when the engine is not running. White smoke at start-up depends on a couple of things. Tell me, where do you live? When the weather is very cold, all engines will emit steam (white smoke) when they are first running; this stops after the engine has been running a while and is warm.

In short, if this is only happening at first start of the morning and goes away over time, there is nothing wrong.

If, however, the "white smoke" continues and never stops, you may have a blown head gasket.

Does it use any oil, or lose any coolant? If not, do you make a lot of short trips, then shut it off by chance? If your not using oil, or coolant, then I'd say take it on a long drive at highway speeds to drive out the moisture laying in your exhaust system. Recently had a muffler go on wife's car that does a lot of short trips, and old muffler was almost full of water from condensation and obviously poor exhaust design, that allowed it to build up like that. Took it next night on trip about an hour away. Every time I took off, or passed a car, white smoke rolled out the back. On way home, it stopped and cleared up.

cylinder head valve seals needs to change.