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The ECM is just behind the battery on the firewall. It has lots of wires coming to it basically everything you can imagine. If you disconnect it the engine will experience a period of time where it has to learn everything again. Like waking up in the morning. Earnie

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Q: 1990 ford econoline E350 7.5 Liter gas box truck cannot locate engine computer referred to as an ecm or icm?
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