Ignition Coil

WARNING: This page is about a different car, the 1990 Cadillac Allante. However, it is still accessible from the selected car via links, so may be relevant.

For testing 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.

Fig 1: Testing HEI Coil

Courtesy of GENERAL MOTORS CORP.