Exhaust Pipe Smoke - Black
Check Engine Light Step 2 - When a fuel pressure regulator fails it allows raw fuel to enter the engine producing black smoke. Visit - Check fuel pressure regulator
Inspecting Vacuum Feed Line
Testing Fuel Injector Step 4 - Occasionally a computer can malfunction holding the injector drivers open longer than it should, causing an excess of fuel producing the black smoke.
Computer Module Step 5 - A bad computer system ground can lead to a malfunction that can include allowing too much fuel to enter the engine producing black smoke, inspect wiring harness grounds at the battery and engine.
Computer Ground Step 6 - On older engine's inspect under the hood for vacuum leaks which can cause the computer to malfunction creating black smoke. Visit - Checking vacuum leaks
Broken Vacuum Line