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White smoke in a 4D56 engine typically indicates incomplete combustion, often due to issues such as fuel injector problems, a malfunctioning fuel pump, or low compression in the cylinders. It can also be a result of coolant entering the combustion chamber, suggesting a potential head gasket failure. Additionally, cold weather can lead to white smoke during initial startup, as condensed moisture evaporates. Regular maintenance and diagnostics are essential to identify and address the underlying causes.

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