Begin with the vehicle on level ground, parking brake set while wearing protective eye wear and glove
Step 1 - If the check engine light has illuminated the PCM has detected a malfunction that could be causing the black smoke such as a shorted fuel injector
Step 2 - When a fuel pressure regulator fails it allows raw fuel to enter the engine producing black smoke.
Step 3 - A stuck or shorted fuel injector can allow too much fuel to enter the engine.
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.
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.
Step 6 - On older engine's inspect under the hood for vacuum leaks which can cause the computer to malfunction creating black smoke.
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