White Smoke at start up????????????

[z32fairladyz90]

I own a 1990 300ZX TwinTurbo(RHD) which has approx 125000 Kilometers on car. A few weeks ago I had a problem where the car would have a rough idle, no power, but would still run and drive and then eventually go away, it happened approx 4-6 times and lasted at longest 200kilometers of driving. I cleaned the MAF sensor and havnt had that problem since, The car runs Great, awesome power, perfect idle, beautiful start ups just a pleasure to drive but problem. The car is emitting white smoke after sitting for 8-12 hours, only at start up and lasts maybe 5-10 minutes or untill warmed up. I can stop after that and restart with 0 smoke emitted and like said zero problems other than that. I recently had a complete timing belt, fluids, spark plugs, the whole works done to the vehicle by the best shop in town costing a small fortune. I checked the coolant and its completely full with perfect colour. The oil has lost a little(1/4) but Im due for an oil change and the colour is right. Pulled some plugs no oil on them but they had a little bit of brown deposits which i was told is good/normal? So my issue is mysterious brief white smoke at cold start ups or any start up after sitting for a period? Any good ideas on whats going on? It doesnt seem like condinsation which a normal thing at start up it is white smoke and abnormal.

[Zwicked]

Do you park outside in these cooler days? That often happens just from condensation when you have been driving it, or if it's warm during the day and cool at night. Start it up and stand at the back. Does it smell like normal exhaust steam?If it smells like coolant or rear rich on fuel then there is an issue, but what you are describing sounds normal.

[TeenHeat]

Valve Stem Seals maybe?

[Shift_ttz32]

i have the exact same problem.. I was told that one of my turbos is leaking oil and the seals tighten up after it warms up so thats why it stops smoking after full warm up.

[evildky]

sounds like a blown HG, when you start up and it smokes white, is it kinda sticky? smell kinda sweet and rich? if so keep an eye on the coolant, you are leaking coolant into your engine when it sits, and it will get worse and start blowing exhaust into your coolant system at some point, I hate to be the barer of bad news but it is what it is