Turn the idle mixture screw in to lean the mixture, out to richen the mixture.
A lean mixture is referring to the gas/air ratio. Lean being less gas
Lean is a mixture of weed and grey goose!
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A vacuum leak can cause a lean burn.
turn clockwise or inward to lean the mixture.
12:1 for rich mixture and it is 15:1 for lean mixture
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Bank 2 post catalyst lean condition
"Rich" and "lean" refer to the air/fuel mixture. Rich means a higher proportion of fuel than is needed and lean means less. An overly rich mixture can foul plugs, cause sluggish performance and promote carbon buildup in the combustion chambers, as well as decrease fuel economy. An overly lean mixture can cause jerky, hesitant performance, overheating and in extreme cases even melt a piston crown.