What Causes Spark Plugs to Fail? Common Issues Explained

Discover the common problems that can cause spark plugs to fail and learn how to maintain optimal engine performance.

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Worn electrodes and carbon buildup are common issues that cause spark plugs to go bad. Over time, this wear reduces the spark efficiency, resulting in engine misfires and poor fuel economy. Regular inspection and replacement, typically every 20,000 to 40,000 miles, can prevent these problems and maintain optimal engine performance.

FAQs & Answers

  1. How often should spark plugs be replaced? Spark plugs should typically be replaced every 20,000 to 40,000 miles to avoid performance issues.
  2. What are the symptoms of bad spark plugs? Symptoms include engine misfires, reduced fuel economy, and difficulty starting the engine.
  3. Can worn spark plugs affect fuel economy? Yes, worn spark plugs can lead to poor fuel combustion, significantly reducing fuel economy.
  4. What causes carbon buildup on spark plugs? Carbon buildup can be caused by incomplete combustion, often due to rich fuel mixtures or improper ignition timing.

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To maintain your vehicle's performance, consider checking out our related videos on engine maintenance and tips for improving fuel efficiency.

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