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Ignition Coil Resistance

Remove distributor cap, rotor and dust cover. Using an ohmmeter, measure primary and secondary resistance. See Fig 1 . Replace ignition coil if readings are not within specification. See IGNITION COIL RESISTANCE table.

IGNITION COIL RESISTANCE

Application Primary Secondary
Cold (1) 0.36-0.55 9000-15,400
Hot (2) 0.45-0.65 11,400-18,100
(1) Temperatures between 14-104°F (-10-50°C)
(2) Temperatures between 104-212°F (50-100°C)
Fig 1: Measuring Ignition Coil Resistance (Prizm)
G95D30828Courtesy of GENERAL MOTORS CORP.
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