Problem With Black Exhaust on a Tailpipe
A vehicle exhaust system contains tubing in the form of one or multiple exhaust pipes which guide exhaust gases away from the controlled combustion in an internal combustion engine. Black exhaust emitting from a tailpipe can indicate engine trouble and should be addressed to prevent further problems.
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Defective Temperature Sensor
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The combustion mixture, comprised of fuel and air, is used by the engine during the combustion process. Too much fuel in this ratio produces a rich combustion mixture, which can result in black exhaust through the tailpipe. Check for a defective coolant temperature sensor, which adjusts the fuel/air ratio based on the temperature of the coolant and replace it as needed to correct the excess fuel ratio.
Clogged Air Filter
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Air filters, which allow air to enter the engine combustion chambers, can clog and restrict air flow, leading to excess fuel in the chamber, resulting in black exhaust fumes exiting through the tailpipe. Replace the air filter to eliminate the excess fuel problem.
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Bad Fuel Injection Sensor
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A defective fuel injection sensor may send incorrect data to the injection system, which may then inject excessive fuel into the cylinders, resulting in black exhaust smoke ejecting out the tail pipe. Inspecting the fuel injection sensor for damage and replacing it as needed, typically restores the proper combustion mix ratio.
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