Why Does Exhaust Have a Gasoline Smell?

[SanHailey]

Car exhaust has a gasoline smell because the gasoline is not completely burned. Gasoline smell in exhaust during cold starts: When the engine is cold-started, the temperature of the catalytic converter is low and has not reached the working temperature. Under low-temperature conditions, the engine does not burn fuel completely, and some gasoline is expelled through the exhaust, which is a normal phenomenon. Gasoline smell in exhaust when the engine is warm: When the engine is warm, the air-fuel mixture is too rich, and gasoline is expelled without being completely burned, resulting in a gasoline smell in the exhaust. Usually, when this happens, the engine malfunction indicator light will turn on. At this point, you can check the spark plugs, ignition coils, and fuel injectors. Failure of the spark plugs or ignition coils may cause ignition failure, and poor fuel atomization can also affect the formation of a uniform air-fuel mixture in the cylinder, impacting combustion. Other situations where a car has a gasoline smell: Failure or damage to the catalytic converter can cause severe clogging of the oxygen sensor, rendering it ineffective in purifying the exhaust, leading to a gasoline smell. The only solution in this case is replacement.