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The air mass meter measures the density of the air. Which then is calculated thru the ecm for the proper amount of fuel to make the perfect burn. When the perfect burn happens, which it never does, but on paper any way, the burn makes water vapor and carbon dioxide. Since that never happens especially in a car engine we need all these other things to get it somewhat close to perfect.
The black smoke could be that the fuel pressure regulator is bad, making the car run rich. It could just be soot built up in the exhaust system, then every once in a while you push the gas pedal to the floor and all of the crud is blown out. Another possibility that I can think of, is that your flame trap is in need of maintence, this can cause oil to accumulate in the bottom of the intake manifold, when that oil warms up and gets a little fluidy, the sudden rush of air when the pedal is floored can cause some of that oil to be ingested, hence the smoke. You don't state any mileage or maintence records so these are just guesses.
Some of this rambling is from my observations with my own car, and may be contradicted by those who are much more knowledgeable than me.
DanR 94 964 249,000 miles (15,000 on the new engine)
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DanR
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