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IMPORTANT: enter the case-INsensitive alphabetic (no numbers) code AND WRITE SOME SHORT summary of changes (below) if you are saving changes. (not required for previewing changes). Wiki-spamming is not tolerated, will be removed, so it does NOT even show up in history. Spammers go away now. Visit Preferences to set your user name Summary of change: A guy (Alfred) sent me an ECU where I replaced two burnt out IGBTs. The ECU controls a BMW M50, 6 cyl engine, 60-2 trigger, no cam sync, with separate passive coils fired in dual-out mode. The coils are wired in a non-standard way, they get fed voltage in pairs where each pair has it's own 7.5A fuse. So cyl 1+6 coils share a 7.5A fuse, etc. What could cause the IGBTs to overheat? Reasonable answers are excessive dwell or failure to remove fuses during an upgrade. The coils connected to the outputs are also dead, hard to say which came first but the coils probably died from the IGBTs short circuiting. Shouldn't a 7.5A fuse blow and protect the coils from that? Could "bad" coils cause this? Should one use an even smaller fuse? This doesn't seem to be a problem in most installations where you don't even have a separate fuse for the coils, like when using the stock M50 harness. Information about the install is sketchy at best and I've requested full details and story. For one, the harness is custom made and the ground for the coils was connected to the chassis but had come loose. I don't know what came first. Optional: Add document to category: Wiki formatting: * is Bullet list ** Bullet list subentry ... '''Bold''', ---- is horizontal ruler, <code> preformatted text... </code> See wiki editing HELP for tables and other formatting tips and tricks.