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Originally Posted by Ely Mae
what is an ignition control unit... I think I need the same exact thing.
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If you have a Fox the ICU or Hall efect ignition control unit would be located on the underside of the right side of the dash behind the glove box, near the larger engine control module. That is assuming you have a CIS or Digifant II Fox, Digifant I (California emmission) Foxes did not use an ICU. Usually when an ICU goes bad you lose all spark, but on rare occurances I have seen an ICU that will quit when hot, then after a minute will begin working again. It is usually simple to diagnose as there is no spark for the few minutes it is inoperative. However, even under this scenario, the Hall sender in the distributor should be checked also. Again, Hall senders in the distributor (and a bad wiring connector at the distributor) usually will just quit, but are just as rarely able to work intermittently when hot, causing loss of spark.