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Old 05-16-2009, 09:31 PM   #1 (permalink)
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Question Need TFI help. 85 B2

So..I'm helping my buddy with his 85 B2, died while driving, No spark.
Before calling me he replaced the ignition coil, the pick up coil, tfi module, cap, rotor, and wires. Local Auto Zone tested old module and it was bad.

After lots of testing, I still have no pulse from TFI to the coil. The TFI has power but no ground wich comes from ecu according to wiring diagram. I disconnected it from the ecu and grounded it but still no pulse. I pinned out the ecu and I have all powers and grounds to it.

So my next question is what is the blue wire from the ecu to TFI for ? I'd like to know before I tell him to replace the ecu.

Best I can figure is... Power to pick-up coil, ground to pickup coil, tach back to ecu? I don't see any power or ground on this wire. Anyone know or have any helpfull insight? Besides converting to duraspark.
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Old 05-17-2009, 10:29 AM   #2 (permalink)
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It goes to pin 56 on the ECU. I don't have the diagram that gives what each pin on the ECU is though...

BTDT.. wrote the article... http://www.broncoii.org/techpages/duraspark/index.html
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Old 05-17-2009, 05:17 PM   #3 (permalink)
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Yeah, I made it that far too, can't figure out what it's purpose is though. I have no power, ground, or pulse at that wire, thats why I'm stumped. I would think something should be present there.
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Old 05-17-2009, 09:23 PM   #4 (permalink)
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I had the same prob...I found out where the TFI plugs in I wasnt getting a good connection.. You can eather change the inside of the dist, Im a moron & cant remember what its called.. Or pull the Dist & put the TFI on it then you know its getting a connection...


It took me about 8 years of working on & off on it to find that out...
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Old 05-17-2009, 09:35 PM   #5 (permalink)
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Thats definetly worth checking, and may explain the mysterious blue wire being dead. I don't think it would explain the lack of ground from the ecu, but perhaps I have more than one problem. Perhaps the ecu needs some sort of signal from the blue before it provides ground? Definetly won't hurt to check out. Thanks
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Old 05-19-2009, 09:47 AM   #6 (permalink)
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http://www.auto-diagnostics.info/pdf/ford_eectec10.pdf

TFI tester

http://www.therangerstation.com/tech_library/TFI_Diagnostic.html

these should help
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Old 05-19-2009, 10:38 PM   #7 (permalink)
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Thanks, that is some great tech you found there! I'll be bookmarking that for sure.
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