Ignition Coil Resistance

WARNING: This page is about a different variant/trim than selected.

Remove coil connectors and secondary coil wire. In test "A", use high ohmmeter scale. See Fig 1. Resistance value should be very high (infinite). If reading is not infinite, replace coil.
In test "B", use low ohmmeter scale. Reading should be very low (near zero ohms). If reading is not near zero ohms, replace coil. In test "C", use high ohmmeter scale. Continuity should exist. If no continuity exists, replace coil.

Fig 1: Testing HEI-EST Ignition Coil Resistance

Courtesy of GENERAL MOTORS CORP.