Post by
daemonyk »
https://forums.nicoclub.com/daemonyk-u209878.html
Sun Jun 30, 2013 7:14 pm
Headgasket, at the least. Everything you've described are syptoms of that.
Blue smoke is oil, white smoke is water / coolant. If it's blowing white smoke, you have water getting into the combustion chamber. It is very possible to have a bad HG and still be able to "run fine". That just means that you still have enough compression / combustion per cylinder to make the car go, despite the cracked HG. However, everything you've said, points to bad HG.
Try this. Take the cap off the radiator and start the car. If water starts blowing, thats a bad thing. It means the cylinder pressure is leaking back into the cooling system (which it isn't supposed to) and pressurizing it, thus blowing coolant out of the open radiator. With the cap on the radiator, the coolant escapes into the cylinder instead, and then you get white smoke.