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Platinum/Iridium Spark Plug

By Rob Sturtz, April 15, 2008

The spark plug uses the energy produced by the ignition coil to generate the spark necessary to ignite the air/fuel mixture in the combustion chamber. The platinum/iridium spark plug uses harder metals on the electrodes, which increases their life to over 100,000 miles in most applications.

Symptoms of a Bad or Failing Platinum/Iridium Spark Plug

  • Check Engine Light may come on or blink
  • Engine may run roughly
  • Abnormal engine noise due to loose or missing spark plug

Platinum/Iridium Spark Plug Related Repair Advice

  • Failing spark plugs can cause the engine to run rough and misfire, which can trigger the Check Engine Light. Continuing to drive under these conditions can damage the catalytic converter.
  • Engines may have one or two spark plugs per cylinder and each spark plug can have from one to four electrodes
  • Replacing spark plugs can be labor intensive on some late model vehicles
  • To prevent ignition misfires and Check Engine Light problems, we recommend using only high-quality spark plugs, and preferably spark plugs from the OEM
  • Spark plugs have different ratings and it's important that the correct type are used
  • Spark plug terminals wear down over time and can lead to engine misfires. At a minimum, they need to be replaced at the mileage specified by the vehicle manufacturer.
  • Manufacturer's instructions should be followed when removing spark plugs. Cylinder heads made from aluminum can be damaged if the correct procedures are not followed.

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