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White smoke is usually caused by water in the ignition system(blown head gasket or water in the gas tank due to condensation. If it clears up after running for a while, you should try a gas conditioner in your fuel tank. If its constent, then do a compression test and to check your head gasket. White smoke is water; Blue smoke is oil; and black smoke is flooding or too much gas. ADDED NOTE: I have had an occurence where a brake fluid leak(at the master cylinder) allowed the vaccuum operated BRAKE BOOSTER to suck in fluid into the intake manifold, causing WHITE SMOKE..

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