Practice question

What is the purpose of the resistor found inside many modern spark plug caps?

  1. To suppress electromagnetic interference (RFI) that can disrupt the CDI or digital dashboard
  2. To limit the spark plug voltage to prevent electrode wear
  3. To prevent oil from leaking up into the spark plug boot assembly
  4. To step up the ignition system current for a hotter spark

Answer: A — To suppress electromagnetic interference (RFI) that can disrupt the CDI or digital dashboard

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