The Ford Bronco II Ignition Control Module regulates the timing of the spark in the engine, which ignites the fuel at just the right moment for smooth power and economy. The Ignition Control Module, which basically sits between the ignition coil and the sensors, has a transistor that opens and closes the coil primary circuit quickly to build the voltage leap that goes to each spark plug. The early Ford Bronco II models incorporated a distributor that leveraged the Ignition Control Module. The module read the pulses generated from a magnetic pickup or hall effect switch that revolved past a reluctor. Old school centrifugal and vacuum mechanisms still governed advance. Later versions of the Ford Bronco II adopted a distributorless ignition system. In this system, the engine computer, in conjunction with a crankshaft position sensor, worked with the Ignition Control Module. This allowed software to command both base timing and advance. Thus, emissions were trimmed and efficiency was boosted. Although these differences exist, the common signs include no spark, a test light never flickering on the coil negative, rough idle, stalls, poor mileage, all pointing towards a faulty Ignition Control Module in any Bronco II.
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