TSB : Spark (Coil)

Details

Check for spark at coil wire. Hold wire about 1/4" from an engine ground, and crank engine. If spark is produced, coil is okay. If spark is not produced, use a voltmeter to check voltage at negative side of coil (tach signal) while cranking engine. If voltage does not exist, see IGNITION COIL POWER SOURCE. If voltage does not fluctuate, check coil wiring, power transistor, ECU and distributor assembly. If voltage fluctuates, check coil resistance, coil wire and connections.