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Ignition Coil

  1. Detach wiring connectors from cap.
  2. Turn four screws and remove cap and coil assembly from lower housing.
  3. Connect ohmmeter, test 1, see Fig 1 . Reading should be zero, or nearly zero. If not, replace coil.
  4. Connect ohmmeter both ways, test 2, see Fig 1 . Use high scale. replace coil only if both readings are infinite.
Fig 1: Testing HEI Coil
G00114067Courtesy of GENERAL MOTORS CORP.