What are the pungent eyes of Subaru Legacy exhaust?

Insufficient combustion of gasoline and excessive mixture result in pungent tail gas.

Insufficient gasoline combustion may be related to many reasons. For example, problems in any part of the fuel system, ignition system and air intake system may basically affect the phenomenon of insufficient gasoline combustion.

Gasoline contains a lot of impurities, olefins and other substances, which will produce anxiety substances after high temperature combustion. After a long time, the throttle will accumulate carbon. This situation requires cleaning the throttle.