I have a MK7 Golf R and this is happening to me too. I posted this over in the MK7 forum and will probably post it on the MK7 R forums as well to document the issue and raise awareness.
Here is a video from my rear dash cam. This has happened to me several times but this is the worst version. Usually it's much smaller puffs of smoke.
https://youtu.be/qEIqh7M_Ock
Sound removed due to lots of swearing. At least If I ever have to evade the cops I know what to do. [emoji6].
I have a different theory than most...
*DISCLAIMER : I am not a mechanic... just an enthusiast with some info and thoughts I wanted to share. This is simply my arm chair theory based on my observations. Maybe you guys could help shed more light.
I believe it's possible the white smoke could be caused from unburnt fuel from a faulty injector or bad spark. Not the PCV. The unburnt liquid fuel gets ejected on the exhaust stroke into the hot side of the turbo and catalyst where it ignites.
The reasons I suspect this are as follows...
1. Smoke is NOT blue-ish like oil smoke would be, it is plain white,
2. Smells nothing like burning oil, it actually smells like firecrackers (I have read this is what emissions smell like on a car that is running beyond rich. AKA, lots of unburnt fuel hitting the cat and igniting).
3. It does NOT smell sweet like coolant burning up in the cylinder would, so, not a cracked head / blown gasket.
4. My oil during the last oil change smelled heavily of gas. The unburnt fuel could be spilling down the cylinder walls and mixing with the oil.
5. One more possible clue that points to unburnt fuel is I have got a low oil pressure warning several times in the past week, it may be possible the fuel is thinning out the oil and lowering the pressure.
Car is at the dealer now, I'll let you know what they say. (I'll also show them this thread)
It almost always happens when I am WOT, 2nd to 3rd gear, and then get off throttle and on to the brakes hard-ish, and upshift. Generally after a turn, but not always. Its like the injector stays WOT for a second or two too long and since your off throttle there is not enough O2 for it to burn all the fuel. Or maybe it doesn't ignite at all, IDK.
Its's possible oil overwhelms the PCV, but my argument against this is that I have a catch can and it does not fill up after these smoke episodes like I have been told it should. (unless the breather line and can are not part of the equation and oil is dumped into the intake somewhere else?). But I have been told the cans will fill up completely during track days and the smoke will occur as the can is overflowing with oil, (or immediately if you don't have one). My car is basically stock, I don't even drive it that hard, I have only about a table spoon of oil in my CC at any given time, but I still get white smoke despite the fact that the catch Cann could hold about two more cups of oil.
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