What are the signs of a vehicle engine running rich?

Signs of a vehicle engine running rich include a noticeable decrease in fuel efficiency, as the engine consumes more fuel than necessary. You may also observe black smoke coming from the exhaust, which indicates excess fuel being burned. Additionally, there may be a strong gasoline odor, and the engine may experience rough idling or poor performance. If these symptoms are present, it’s advisable to have the vehicle checked for issues such as a faulty fuel injector, a malfunctioning sensor, or an incorrect air-fuel mixture.