What does it mean when your car engine is running lean?
What does it mean when your car engine is running lean? Your engine runs lean if your air-to-fuel mixture is too light - this means that the fuel in your ignition chamber is being igniting with too much air or too little fuel. Because your engine is running on less fuel than it should, it is running “lean.” What should fuel trim correction be for lean running engine? The manufacturer selects a level of fuel trim correction (in this case, a positive percentage) beyond which a code will be set. Depending on the details, this level may be as low...