White smoke

[GSX_Dan]

I just installed a used engine in a car that has been sitting for 3+ years. Fuel pump was full of rust as well as the inside of the gas tank. I replaced the pump as the old one was dead. It had some gas inside it, maybe 1/4 tank, but I didn't drain it and now I wish I did I simply put in about 5gallons of 94octane. The problem is as soon as it warms up and I drive the car it pours out white smoke out the tailpipe. It doesn't do it if I just let it idle there. My first thought was the turbo was shot, I checked it and disconnected the water supply going in/out. I did a compression check and it's pretty much perfect. So far my diagnosis should eliminate turbo seal failure and head gasket problems. I am left to suspect the old gas that was in the car...This might be stretching it but the amount of water concentration is the gas is probably great judging from the piles of rust inside the gas tank, in turn making it puff out clouds of white smoke under load when it goes much richer than idle. Can anyone suggest what else the problem could be or how likely my bad gas theory is?

 

[v01dy]

I've had a white smoking problem myself and it turned out to be faulty valve stem seals. To my knowledge the smoke that water forms will dissipate rather quicking once it leaves the exhaust, so IMO I don't think it's bad gas. Anyway the problem that I had was that the valve stem seals were leaking oil into the exhaust and the oil got vaporized there.

 

[GSX_Dan]

This turned out to be the exhaust on the car. Somehow from the car sitting with the hood off for a few months water got inside through the downpipe. The car runs clear as day with it off, while smokes out the neighbourhood with it on. This sure was a first for me...