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Bad fuel pressure regulator, Map. sensor not working or the vacuum line is bad or off of the sensor. You did not say what year it is.
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Black smoke Chevy 5.7?
Black is excessive fuel, or rich.
Why Does Black Smoke Come Out Of Exhaust Of A 1995 Chevy Lumina Until Check Engine Comes On?
Black smoke is an indication that the fuel/air mixture is far too rich. The black smoke is excess fuel being burnt.
Why does my Chevy 350 smoke black then smooths out?
Black smoke is excessive fuel, or "rich." It is probably flooding out at idle. Either the floats in the carb, or the needle, and seat.
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How do you repair a 1994 Chevy S-10 that throws black smoke?
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Black smoke usually means the engine is running too rich. The fuel/air mixture is incorrect. Blue smoke is oil burning.
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The black smoke that a diesel engine blows out is fuel that is unburned. The black smoke can be caused from over-fueling, poor fuel quality, or dirty or worn fuel injectors.
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Black smoke = excessive fuel entering the engine
