tfi module?
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From: shelocta, pa
tfi module?
what would be symptoms for a bad tfi? My truck ran great and now won't start. Can it be tested? I have a real weak spark so i replaced the coil and it's no better. I pulled it off the fenderwell, what size socket will work to seperate it from the heat sink?
Thanks i miss driving my truck.
Thanks i miss driving my truck.
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Joined: Feb 2007
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From: Pittsburgh,Pa.
You are experiencing the most common symptom of tfi failure.Yes it can be tested.Most large chain parts stores (Advance, Auto Zone, ect) can do it for you.The socket you need is 5/32". Check the parts stores as there is a neat little tool for this.Hope this helps.
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From: shelocta, pa
cool, i tried a 5/32. It doesn't fit down in the recess area to get on the head of the bolts to remove it from the heatsink. I tried a deep well 5/32 and it didn't fit. I'll check in town after work, and get a cheap socket and grind it down if needed. so now is ford's worth the 85 bucks or 53 from autozone.
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From: Pittsburgh,Pa.
I'd go the Ford route myself.There is some high quality aftermarket stuff but I'm not familiar with what Auto Zone carries.The little tool I mentioned is a thin walled socket with a spinner **** on it.I think mine was made by Thexton.
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From: Pittsburgh,Pa.
toddol1971 , tfi is the ignition module. If my memory is correct it stands for Thick Film Ignition system.
Last edited by Redcat Diesel; Mar 23, 2007 at 03:28 PM.
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From: The dark carnival
Originally Posted by wrenchturner
what would be symptoms for a bad tfi? My truck ran great and now won't start. Can it be tested? I have a real weak spark so i replaced the coil and it's no better.
