What causes white smoke in your exhaust? My Brother-in-law has an Eclipse turbo that he was this problem with. He has been working on this car extensively-new turbo, alum exhaust, new exhaust manifold- and he is freaked out about this smoke. It only does it when its cold or if it sits and idles for several minutes. Runs great going down the road- more power than I would expect from a 4 cyl! Is this a head gasket problem? Is it just the alum exhaust (cold) and hot exhaust? Any ideas would be helpful!