White smoke when starting the engine. the engine

What is the problem if i start my car if its cold and it smokes blue white smoke but if engin is hot it stops smoking but valve tem seals have been done and there is no play on pistons

white smoke when starting from cold is
condensation of moisture in the muffler/ tail pipe
that is normal .... till the engine warms up

heaps of white smoke when hot
suggests coolant/steam in the combustion chamber

blue smoke is oil
black smoke is fuel

the white "smoke" is probably water vapor from combustion in cold cylinders
as the engine warms up it is super heated in the hot exhaust system and is no longer visible to the eye

White smoke on start up of a cold engine is water vapour created by cold moist air and hot combustion ( steam). Mostly all cars will emit a whit wispy smoke until temperatures are elevated enough for the cat converter to turn it in something you cannot see. To be sure have a compression test done to check for gasket and have a coolant system pressure test done to check for coolant leaks

I seem to be answering a bunch of your questions today. Really hope they are helping in some way. White smoke can be lots of things. I little white smoke on a cool morning or a cold day when you first start the car is completely normal. Its just condensation inside the exhaust and cylinders themselves burning off. Lots of white smoke or smoking on a continual basis is not normal...and bad. Usually white smoke on a hot day, or white smoke after more than a few minutes of running the engine is a sign of coolant burn off. Most common causes there are either a warped or cracked head, or a bad head gasket. Again, hope that helps. I do hope all of these questions are in regards to a single car...if they are...it really might be time to consider either an engine swap or giving it up to the scrap yard...blue smoke AND white smoke add up to big problems. Both at the same time out of the same engine on a regular basis, really sounds like a cracked head in my opinion. Either way, good luck man!

white were? the exhaust tip, or other spot, long pipe, name spot?
white, is steam or OIL.
oil smells like burnt oil and takes for ever to dispate
steam is water, and smells , sweet due to 50% glycol inside.
and goes away fast.
but all Gas engines make water at all the time running as a by product of combustion and for sure on cold days, some times full time cold
due to climate effects.
does your neighbors car smoke at same time, (look)
bingo , dew point.

all gas engine smoke cold started, (steam)

so first find out what it is,
take the dip stick out of a hot engine. stalled, drip it on the exhaust
see that smoke ,smell it? that is burning oil
now you know what you have, steam or oil. smoke.

This seems to be a symptom of a blown head gasket.
White exhaust smoke is an indication of water / coolant in the exhaust. The car running sluggish and using lots of fuel can be caused by compression loss.

Look at the coolant level color and smell (with cold engine - don't open the high pressure reservoir with engine hot as hot coolant may spray you in the face). If you have a blown gasket, the coolant color may become brownish and it may smell bad or the level will get lower even if you have just refilled the cooling system.

What you can also check for is bubbles in the reservoir. With engine cold, remove the reservoir cap. Start the engine. Try to rev the engine (or have someone do it) and observe if there are bubbles in the reservoir tank. If you see lots of bubbles, you have a blown gasket.

all engines do cold. its water vapor and or the hot exhaust, causing the air, to change dew point, (looks like steam)
on the white smoke smells like burned oil , it is, and is slow to dissipate like steam, (see moms tea pot , and steam fast dissipation?)

if it is oil , its most likely bad valve guides and seals, or both.
if a compression leak down test passes, its not rings, (mostly)

Check Air Filter or if fuel mixed with water/eny lquid

Ouch! you've got engine coolant in the exhaust from a leak somewhere...DO NOT run this engine until you get someone (dealer is best in this instance) to diagnose ($50-125)