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)

Courtesy of GENERAL MOTORS CORP.