![]() ![]() ![]() The conventional ignition system consists of the ignition coil, ignition distributor, spark plugs, spark wires, and a triggering device to control the primary side of the ignition coil. You can look at the primary ignition trigger on the negative side of the ignition coil with a test light or a Lab Scope Primary-Ignition-System : Distributor Ignition SystemsÄistributor ignition systems fire the coil to ignite the spark plug during the compression stroke for each cylinder. The PCM receives inputs from the crankshaft position sensor which in turn uses this signal to control ignition timing. ![]() The ignition coils primary circuit control, has been replace with the Powertrain Control Module (PCM) Late-model cars stop using a distributor to direct the secondary voltage to the spark plugs. ![]()
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