How to Tell if Your Engine is Running Rich or Lean?

Learn how to diagnose if your engine is running rich or lean through spark plug inspection. Get the right mixture for optimal performance.

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Running rich means your engine has more fuel than necessary, while running lean means it has less. Check your spark plugs: black soot indicates rich, while white or light gray ash indicates lean. A proper mixture will have a tan or brown color.

FAQs & Answers

  1. What does it mean to run rich or lean? Running rich means too much fuel in the air-fuel mixture, while running lean means too little fuel.
  2. How can I tell if my engine is running rich? Inspect the spark plugs for black soot; it's a sign that your engine is running rich.
  3. What should my spark plugs look like for the right mixture? A proper fuel mixture will show spark plugs with a tan or brown color.
  4. What are the symptoms of a lean running engine? A lean running engine may show spark plugs with white or light gray ash and could lead to engine misfires.

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