Odd White Smoke at Cold Start-Up

Hi all, I have a 13' SR5 with just over 39K miles and have noticed a large puff of white smoke at cold start-ups in the last few months. I don't see it every time but saw the largest puff yesterday. It's definitely smoke and doesn't appear to be condensation from the muffler. The truck gets regular maintenance and there are no visible leaks of any fluids. I only use 91 octane fuel and park it outside full-time. I don't drive it everyday ...maybe 4-5 times/week. Typically after a few seconds, the smoke goes away and I don't normally see it while driving but there was a time a month ago where I saw the smoke while sitting at the stoplight leaving my neighborhood but then it was gone a bit after that. I'm a bit concerned as I have never seen this before from any other vehicle I've owned. I know white smoke can be a sign of a bad head gasket but I think the white smoke continues while driving and that's not the case in my situation, plus I'd be extremely shocked if I had a bad head gasket given the low miles on this truck and its regular maintenance. Since I've owned the truck (just over 2 years), I have noticed this black smog build-up on the body at the exhaust exit point. This may just be normal and more obvious given the white body but thought I'd throw this in there. Any idea what might be the problem, or is this normal for the Tundra?
Thanks!

 

Yours sounds like condensation which is totally normal.

 

Aah of your worried that it's overheating then rent the radiator exhaust gas tester and it's solution from autozone and verify that you haven't blown your head gasket.

But most likely it's just condensation.

 

Yes, hoping it's just condensation. However, condensation burn off typically looks like steam. This is plain and simply dry white smoke, and a large puff comes out to the point that I only first noticed it blowing by my passenger window. The typical condensation burn off that resembles steam normally stays near the tail pipe exit and dissipates from there and persists longer than what I'm seeing. In all the cars I've ever owned and driven over several decades, I've never seen anything like this before. Just wondered if this is some odd thing with the Tundras, maybe by design of the engine or exhaust system. I'm 95% sure I don't have a bad head gasket but I can do the solution test at the overflow tank to confirm. I was more curious if others on here have noticed the same thing but sounds like not.

 

So if you do see a white puff and not steam then you may have leaky valve stems. But I am not sure if those were used in this engine. But that is probably what it looks like.

But if that is the case then it's not really too much of a worry. Just check your oil consumptions from time to time.

 

Huh. Is weird.

Bad head gaskets are rare in these things. Unless the motor/coolant has really gotten hot, id almost rule it out. (Id still check but id be pretty surprised).

Hows the oil look? Know its low miles. Have you owned since new?

 

Yeah, my thoughts, too on the head gasket. Rare issue and most likely not my problem. Oil looks good ...still golden on the dipstick since the last oil change, which was about 3K miles ago or so. I am not the original owner. I bought it just over 2 years ago from a gentlemen who only put 24K miles on it from 2013 to 2021 (he was the original owner). I confirmed the mileage was correct through CarFax and the dealer service records. I'm pretty puzzled. I'm almost certain this is not condensation evaporation as it's whiter, more dense, and dry looking, not opaque/translucent white and moist looking like condensation burn-off is. I see barynavab's comment about leaky valve stems. I might need to have my mechanic check on that if it's something that could be diagnosed without disassembling half of the engine.