How to Identify a Bad Iridium Spark Plug

Learn the signs of a bad iridium plug and how to inspect and test it for optimal vehicle performance.

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To determine if your iridium plug is bad, lookout for signs like difficulty starting your vehicle, engine misfire, poor fuel economy, or a noticeable decrease in acceleration. An iridium plug's lifespan can be quite long but is not immune to wear and tear. A visual inspection for any physical damage, such as cracks or erosion on the electrode, can also indicate a need for replacement. Using a multimeter to check for electrical continuity is another effective method. If you're experiencing these issues, replacing the plug might be necessary for optimal performance.

FAQs & Answers

  1. What are the symptoms of a bad iridium plug? Common symptoms include difficulty starting the vehicle, engine misfires, poor fuel economy, and reduced acceleration.
  2. How can I visually inspect my iridium plug? Look for cracks or erosion on the electrode. Any physical damage may indicate the need for replacement.
  3. What tools do I need to check an iridium plug's condition? You will need a multimeter to check for electrical continuity and a socket wrench to remove the plug for inspection.
  4. How often should iridium plugs be replaced? While iridium plugs have a long lifespan, they should be inspected regularly, especially if you experience performance issues or at manufacturer-recommended intervals.