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I believe they switched form TFI in 1984, and they were all EEC IV until the end of 1991, but I am not 100%. I think the way to tell is you have the EEC-IV if your ignition module is on your distrubor.
But please wait until someone confirms this. Also you could try google and look for a picture or description on EEC-IV distributors.
I think you mean Duraspark II (460 had Duraspark II untill the end of 1987)
Originally Posted by AMDCAMARO
and they were all EEC IV until the end of 1991,
I think you mean 1996 5.8L (> 8500 GVW)
Originally Posted by AMDCAMARO
I think the way to tell is you have the EEC-IV if your ignition module is on your distrubor.
Not true, some had them on the fender.
Ford refers to their solid state ignition in several different ways. 1976 systems are referred to simply as Breakerless systems. In 1977, Ford named their ignition system Dura Spark I and Dura Spark II. In 1982 Ford dropped the Dura Spark I and introduced the Dura Spark III. This system is based on Electronic Engine Control (EEC). The EEC system controls spark advance in response to various engine sensors. This includes a crankshaft position sensor which replaces the stator and armature assembly in the distributor. Dura Spark II is the version used in all states except California. Dura Spark I and III are the systems used in California V8's only. Basically, the only difference between the two is that the coil charging currents are higher in the California vehicles. This is necessary to fire the leaner fuel/air mixtures required by California's stricter emission laws. The difference in coils alters some of the test values.