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post #1 of 10 (permalink) Old 11-13-2012, 09:53 PM Thread Starter
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What is this?

Can anyone identify the Motorcraft unit in the photo? It's located just below the main wiring harness on my 95 Bronco



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post #2 of 10 (permalink) Old 11-13-2012, 09:58 PM
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Well I have an '88 so I am not sure but it looks like the TFI module. IIRC the later years were mounted on the fenders instead of the dizzy.
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post #3 of 10 (permalink) Old 11-13-2012, 10:05 PM
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Well I have an '88 so I am not sure but it looks like the TFI module. IIRC the later years were mounted on the fenders instead of the dizzy.
He is right it's the TFI.

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http://s1334.photobucket.com/
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post #4 of 10 (permalink) Old 11-13-2012, 10:08 PM Thread Starter
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Thanks guys. What does the TFI do?
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post #5 of 10 (permalink) Old 11-13-2012, 10:09 PM
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post #6 of 10 (permalink) Old 11-13-2012, 10:11 PM
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Thanks guys. What does the TFI do?
The Thick Film Ignition module, type IV serves two functions.

1. It accepts a very weak signal from the distributor (a 'trigger" signal, by a Hall Effect method) and uses that trigger signal to open and close a solid state switch to the ignition coil.

2. It measures the current loading to the ignition coil, and adjusts the current sent to the coil to the optimum so it reaches saturation, but is not overheated with excess current.

Basically then, it replaces the function of the mechanical breaker points in controlling the ignition coil, which had two parameters. One, the timing as to when the points opened, controlled by a cam., And two, the dwell (time points are closed, usually stated in degrees of rotation of the distributor) to charge the coil. Both the timing and the dwell are critical to engine performance, and points require regular maintenance. Even when performing well, there are still shortcomings, especially at high engine speeds.

While originally electronics came to automobile ignitions for improved performance and reliability; the advent of emissions regulations made them mandatory in order to minimize maintenance needs, and even just to meet requirements.

An associated note--- the TFI-IV has a history of problems when it is MOUNTED DIRECTLY on the distributor. If overheated, it will simply not function, though usually recovers when cooled sufficiently. Many hobbyists who use the module in their vintage cars use a wiring adapter and move the module itself to a cooler location under the hood, and keep the advantage of the electronics but avoid the overheating troubles. Ford Motor Co. settled a class action suit over the issue years ago.

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post #7 of 10 (permalink) Old 11-14-2012, 01:43 AM
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post #8 of 10 (permalink) Old 11-14-2012, 03:44 AM
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95 should be on the drivers fender..the metal fender. Is it still there?
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post #9 of 10 (permalink) Old 11-15-2012, 09:14 PM Thread Starter
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Originally Posted by GetBent4x4 View Post
95 should be on the drivers fender..the metal fender. Is it still there?
Yes it is....
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post #10 of 10 (permalink) Old 11-15-2012, 09:15 PM Thread Starter
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Originally Posted by defcon5 View Post
The Thick Film Ignition module, type IV serves two functions.

1. It accepts a very weak signal from the distributor (a 'trigger" signal, by a Hall Effect method) and uses that trigger signal to open and close a solid state switch to the ignition coil.

2. It measures the current loading to the ignition coil, and adjusts the current sent to the coil to the optimum so it reaches saturation, but is not overheated with excess current.

Basically then, it replaces the function of the mechanical breaker points in controlling the ignition coil, which had two parameters. One, the timing as to when the points opened, controlled by a cam., And two, the dwell (time points are closed, usually stated in degrees of rotation of the distributor) to charge the coil. Both the timing and the dwell are critical to engine performance, and points require regular maintenance. Even when performing well, there are still shortcomings, especially at high engine speeds.

While originally electronics came to automobile ignitions for improved performance and reliability; the advent of emissions regulations made them mandatory in order to minimize maintenance needs, and even just to meet requirements.

An associated note--- the TFI-IV has a history of problems when it is MOUNTED DIRECTLY on the distributor. If overheated, it will simply not function, though usually recovers when cooled sufficiently. Many hobbyists who use the module in their vintage cars use a wiring adapter and move the module itself to a cooler location under the hood, and keep the advantage of the electronics but avoid the overheating troubles. Ford Motor Co. settled a class action suit over the issue years ago.
Wow! This is great info. Thanks so much...
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