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