What Causes Smoke from the Exhaust Pipe?

[EmilyMarie]

Exhaust pipe smoke can be caused by: 1. Contamination of the vehicle's air filter, leading to insufficient air intake; 2. A large amount of white water vapor being emitted from the exhaust pipe during engine operation; 3. High temperatures in the cylinder causing gases to transfer to the oil pan; 4. White smoke appearing during cold starts, which disappears as the engine temperature rises. The exhaust pipe is part of the engine's exhaust system, which mainly includes the exhaust manifold, exhaust pipe, and muffler. Typically, the three-way catalytic converter, which controls engine pollutant emissions, is also installed in the exhaust system. The exhaust pipe generally consists of a front exhaust pipe and a rear exhaust pipe.