Engine Smoke Warning: Diagnosing Excessive Exhaust Emissions #2238110 (License: Personal Use)

This stylized illustration depicts two crossed engine pistons with yellow combustion chambers, each expelling dense black smoke-indicating incomplete fuel combustion, often due to a rich air-fuel mixture, clogged air filters, worn piston rings, or faulty fuel injectors. The design uses high-contrast grayscale with metallic highlights to emphasize mechanical failure and emission hazards. It serves as an iconic warning symbol in automotive diagnostics and repair guides.

Used on auto repair blogs, mechanic training materials, emissions compliance pages, and diagnostic tool landing pages; targets users searching for causes of black exhaust smoke or engine performance issues.