Black Smoke From Tailpipeīlack smoke is typical of an engine that is running rich. This will surely set the combustion up for an inefficient process and cause the engine to misfire. In both of the scenarios, the cylinders will be injected with improper mixtures and sometimes may even have an uneven spray pattern. While if the ECU detects too much air flowing in, it may increase the fuel mixture to match the air coming in causing the engine to run rich. If the airflow data sent is recognized as too little, the ECU may hold back on fuel causing a lean condition. A bad mass airflow sensor can upset the vehicle in both ways. Either the engine is running too rich or too lean. Misfires can occur for a number of reasons, one of them being disturbed fuel ratios. When the amount of air drawn in is significantly higher than fuel or vise versa, it is a given that the combustion reaction will proceed as normal.
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