Heavy smoke at start up

Hello,

White smoke out of the tailpipe can be due to a number of reasons.
It could be for a blown head gasket, cracked cylinder head, intake manifold gasket leak.
Keep in mind that it is possible to have a small leak in the head gasket which is allowing coolant into the engine, but it is small enough that is not easily noticeable on the oil.

Here is helpful guide:

https://www.2carpros.com/articles/white-smoke-or-steam-coming-from-the-exhaust-pipe

It might be a good idea to do a chemical head gasket leak test. On that test it measures any combustion gases in the coolant. Which is a sign of head gasket leak.

Here is a video showing how to do that:

https://youtu.be/5zpNjYmmiYY

Please let me know of any questions.
Thank you.

Sometimes with a small amount of leak the coolant can just accumulate overnight. So, on the first startup it burns through the combustion chamber, and you see the smoke till it clears off.
In some I have seen excessive condensation build up and creating the white smoke.

Is this something just started to happen or has been going on for some time? And any drivability issues?

From what you are describing it does not sound like a blown headgasket, especially since you are not loosing coolant. But then again if the leak really minor it might not be noticeable for several weeks. Let me know if you are able to do the test, this way you can either confirm or check it off the list.

Does it only happen in cold start in morning?
Does the engine idle differently while you have the smoke?
What about check engine light, is it illuminated?

Another possibility is that you could have faulty injectors that gets stuck in the open position and on cold startup it creates the white smoke.

If there was a coolant flow issue, it would likely cause the engine to overheat. Keep in mind that some of these cooling systems it might be obvious of the coolant flow, just by looking at the overflow reservoir.

We had someone with this type of excessive white smoke issues that ended being a cracked intake manifold, which was causing to have excess condensation.

You can check to leak in the intake manifold by spraying carb cleaner into the base. If there is a leak the engine will react to the chemical and idle high, until the chemical is burnt off.