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Q: Rough running and wht./ blue smoke on 1995 Saturn SC1

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I had a fuel pump replaced. Now the car runs rough and white / blue smoke emits from the exhaust. what has caused this? It ran fine without any smoke prior to failure of the fuel pump.
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White smoke or steam from the exhaust could be a sign of a blown head gasket particularly if the engine runs rough. There is a simple test called a block check used to detect the presence of carbon monoxide in the cooling system which would only be present if the head gasket failed. Fuel pump replacement would be unrelated.
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