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White smoke would seem to indicate (and the smell of gas would confirm) unburned fuel going through the engine. One of two things is happening, too much fuel is being fed into the engine or the fuel isn't being burned. I'm assuming a newer fuel injected vehicle here so if this is older and carbureted the answer might be slightly different. My first thought was a stuck or sticking injector. If this is the case, one or more cylinders are being fed too much fuel. The other is that a spark plug isn't firing. I would first check that all of the connectors were firmly connected to the spark plugs. Do get this vehicle to a mechanic. I'm assuming you don't have a way to check the fuel manifold pressure or for any trouble codes in the computer. This shouldn't be a high dollar fix but could potentially be very shortly. Too much fuel will first overheat the catalytic converter and destroy it, and it is VERY expensive. The excess fuel could also wash down the cylinder and thin the oil causing internal engine damage.

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13y ago

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