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Fouled Spark Plug Check

  1. Remove distributor cap. Connect 500V DC megohmmeter between each spark plug wire at distributor and engine ground.
    NOTE: If megohmmeter is not available, proceed to Power Balance Check .
  2. If reading is more than 50 megohms, spark plug is OK. If less than 50 megohms, check spark plug wire. If good, replace spark plug.
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