TFI Module going bad?
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Freshman User
Joined: May 2005
Posts: 38
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TFI Module going bad?
Ive been having problems with my truck ever since I opened up the exhaust a little bit. It ran good for a while, but then just started to run like crap. I dont know much about this stuff, but I have heard that the TFI Modules are known for just randomly going bad. Could this be my problem? I have an '89 F250 with a 300 I6 4x4 and ever since I opened up the exhaust and intake a little I get almost no power, it sounds horrible (almost like its only running on a few cylinders or Im running out of gas) and the little battery charge gauge in my truck says its really low. I also thought that maybe the alternator could be the problem, but I still need to get that tested. Have any of you guys ever had the TFI Module go bad? How did you know it went bad if it did? I had a friend that had one go bad in his mustang, and he bought a new one and it runs good now. Do I even have one in my truck? I posted in the engine forum, but everybody seemed a little reluctant to post. Is this a very common problem with an older pickup like mine? Any advice would help me out, thanks.
Senior User
Joined: Feb 2004
Posts: 292
Likes: 0
From: Kansas City
The TFI module switches the voltage on and off to the coil, before the distributor. Normally when it fails, you get no spark, (as opposed to a couple missing cylinders). Sometimes it will work again when it cools down. I have only heard of it stalling out.
You might try the ignition forum.
You might try the ignition forum.
Elder User
Joined: May 2006
Posts: 623
Likes: 1
From: Mississauga,Ont.,Canada
Both times my ignition modules went bad there was no warning. It just stop running instantly. You indicated that your battery was a little low or not charging. Look after that first and see how the vehicle runs.
Senior User
Joined: Oct 2005
Posts: 389
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From: Berlin, CT USA
You know i have had the exact same problem with my 87 f-150 i did a google search and came up with this, its little old but still helps to better find the problem http://www.autosafety.org/article.php?did=1216&scid=185I have also found that when you turn the truck off i dont hear it cooling itself and sometimes i do hear it, i havent been able to test it i was wondering if its better to take it to ford and just buy the 40$ tester cuz i can get the code reader for free.
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