Mk3 TFI Module Relocation/Extension Kits for all TFI Fords

Finally, a fully “Plug and Play” TFI Relocation solution !

· Relocates your TFI Module from the distributor housing to the passenger fender.


· Combines the PIP signal jumper harness and a TFI wire extension harness in one nine-wire harness!


· NO need to manipulate your existing TFI wires! Just swap in the dummy TFI module for your working one, plug in your existing TFI plug and the distributor end is done!


· Heat sink is Custom Designed by MRM to work with all TFI-equipped vehicles. All materials are aluminum or stainless steel so it looks as nice in a year as it does now! NO RUST!!!


· 48” Harness is FULLY RF SHIELDED and grounded!!!






Ford realized very early that their original plan to use the distributor housing as a heat sink for the 5.0’s ignition module was a bad idea. It took a class-action lawsuit in the 1990’s to make them do something about it. The TFI (Thick Film Ignition) Module is very susceptible to heat damage. The symptoms of this damage can be as light as a occasional miss and tachometer fluctuation to as severe as complete ignition system failure. Getting the car back on the road requires at least the replacement of the TFI Module with new, the price of which can be over $100! The problem is so severe that we know of several Mustang and 5.0 Miata drivers who simply kept a spare TFI in their glove boxes in case the thing fails on the road. Here’s an article from the Center for Auto Safety webpage that goes into greater detail:


1983-1995 Ford Ignition Module Stalling


Our TFI relocation kits include custom designed extruded aluminum heat sinks with just enough Arctic Silver Heat sink grease (much more effective grease that the “white” grease typically used) to handle the job pre applied (no need to buy a $12.00 tube just for this one job). All kits include four aluminum 1” spacers to locate the heat sink off the frame of your car to allow a full 360 degrees of cooling and four stainless steel self-tapping screws to mount it with. Four stainless steel cap screws and a an allen key are included to replace the original Ford Module mounting screws which required an uncommon tool to remove (we can rent you a Ford TFI removal tool if you need one...see below). To connect the relocated TFI module to the distributor a 40” jumper/TFI wiring extension harness is included. The harness is completely RF shielded by a layer of copper RF/EMI tape with conductive adhesive. A grounding wire is wound into the RF layer to provide to ground the harness. To protect the RF layer an outer layer of vinyl tape is applied last and heat sealed to each end. The distributor end of the harness utilizes a gutted donor TFI module to connect both the six existing TFI wires and the three PIP signal wires to the relocated new TFI module.

The TFI end terminates with three female spade connectors that push onto the three prongs that  stick out from the top of your TFI module and a new TFI plug. The TFI end also includes the RF ground lead with eyelet that can be grounded to any good ground source, even the bolt you hold the heat sink in place with. Both ends, as well as the individual connectors, are weather sealed with heat shrink. Due to the extra thickness, MK3 harnesses are also sleeved in nylon mesh.


We originally developed this kit to help protect the TFI module from melt-down in the very hot and cramped engine bays of V8 Monster Miatas. Since offering them for sale customers have installed our TFI kits in many other distributor-mounted TFI Fords including Broncos, F-150’s, Escorts, Tauruses and Mustangs (a complete list of applications can be found below).



Don’t let your TFI system fail on you at a bad time. By using this system you ensure that your TFI is getting the cool air it needs to properly function.

The Mk3 kit includes our heat sink as well as an integrated PIP jumper/TFI wire extension in one shielded harness.

McCully Racing Motors

Quakertown/Barto, PA

Tech Talk: OLD (left) vs. NEW (right):

Our old kits used a reclaimed Ford heat sink which mounted the module on top between the vanes. To be dissipated heat had to travel down from the bottom of the module , sideways and then up. Heat rises. With this in mind we designed our new heat sinks with an “underslung” module mount so that the module’s heat only has to travel up (it’s natural inclination) to be dissipated. As an added bonus the underslung design protects the module better against it’s second biggest downfall, water. SCIENCE!!!!




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Installation of the MRM MK3 TFI kit is very easy and can be accomplished in less than an hour. First, unplug your harness from the TFI module. Next, unbolt the module from the distributor (requires a TFI removal tool...we’ll rent you one). Once the two small screws are removed, carefully slide the module down to release it from the stator coil in the distributor (do not pry the module outward, pull it down only!!!). If you are planning on reusing the original TFI module (not recommended-once they fry once they are usually dead), carefully clean the existing white heat sink grease off of the backing plate. The next step is to take your new or clean old TFI module and, using the original screws, mount it to the kit’s heat sink. DO NOT spread out the gray heat sink grease on the heat sink. The act of tightening the module against the heat sink will spread out the grease. Once the module and heat sink are assembled find a suitable location for it. The limiting factors are the reach of the kit’s extension harness (48”). Once a location has been found, use the included template to drill holes for the kit’s mounting screws (four included, use at least 2), tap the holes with one of the screws and bolt the heat sink down with the included aluminum spacers. Ground the RF shielding wire to one of the bolts holding the heat sink or any other near-by bolt (DO NOT use one of the  screws mounting the module to the heat sink). Install the distributor end of the harness by simply bolting it in place of the original TFI module WITHOUT heat sink grease. Once the distributor end is bolted in place simply plug your original TFI plug into it as it was originally. Run the MK3 harness to the module’s new location and plug the three female plugs into the module with the wire colors in the same orientation as they were shipped (usually black-red-green starting at the non-plug end). Use the included zip ties to secure the harness in place and you’re done! Double check your connections and make sure the harness is free of any moving parts and you’re ready to go.


The following USDM Ford/Lincoln/Mercury vehicles were constructed with distributor-mounted TFI modules and can benefit from our TFI Relocation Kit. Note that some may require a bit more adaptation than others depending on the actual location of the module and length of the TFI branch of their main harnesses:


1984-85 Escort/Lynx (1.6L)
1984-86 Escort/EXP TC (1.6L)
1986-88 Escort/Lynx (1.9L)
1985-90 Escort/Lynx HO (1.9L)
1984-90 Tempo/Topaz (2.3L)
1985-94 Tempo/Topaz HSC (2.3L)
1984-89 Mustang/Capri (2.3L)
1984-86 Mustang SVO TC (2.3L)
1984-86 Mustang/Capri/Cougar TC (2.3L)
1984-85 Mustang/Capri (3.8L)
1984-94 Mustang/Capri HO (5.0L)
1984-88 Thunderbird/Cougar TC (2.3L)
1984-87 Thunderbird/Cougar (3.8L)
1984-91 Thunderbird/Cougar (5.0L)
1986-87 Taurus/Sable (2.5L)
1986-95 Taurus/Sable (3.0L)
1986-87 Taurus/Sable (3.8L)
1986-87 Continental (3.8L)
1984-92 Mark VII (5.0L)
1984-89 Town Car (5.0L)
1984-85 LTD/Marquis (2.3L)
1984-86 LTD/Marquis (3.8L)
1984-94 LTD/Marquis (5.0L)
1985-87 Aerostar (2.3L)
1986-90 Aerostar (3.0L)
1984-89 Ranger (2.3L)
1986-91 Ranger/Bronco II (2.9L)
1984-90 Bronco (4.9L)
1984-91 Bronco (5.0L)
1984-85 & 1988-91 Bronco (5.8L)
1984-91 F-150 Pickup (4.9L)
1984-91 F-150 Pickup (5.0L)
1984-91 F-250 Pickup (4.9L)
1984-91 F-250 Pickup (5.0L)
1984-85 & 1988-91 F-150 Pickup (5.8L)
1984-85 & 1988-91 F-250 Pickup (5.8L)
1984-85 & 1988-91 F-350 Pickup (5.8L)
1984-91 E-150 Van (4.9L)
1984-91 E-150 Van (5.0L)
1984-85 & 1988-91 E-150 Van (5.8L)




Application Data:

The Kit includes the following:

1 heat sink with pre-applied heat grease

4 stainless steel #12 3” self tapping hex screws

4 stainless steel washers

4 aluminum 1” spacers

2 stainless steel M4 cap screws for module

1 3mm allen key for the above screws

3 cable ties

1 RF shielded and fully assembled TFI signal jumper/TFI extension Harness-nylon wrapped

1 set of instructions

To Order Please contact us Via email at:

Price- $190 shipped (domestic)

To build a Mk3 we use a new TFI (gutted) as the distributor end and a new TFI plug as the TFI end. The three red plugs attach the integrated PIP harness to the relocated TFI module. The donor TFI end bolts to the distributor exactly as the OEM one did originally.

The distributor end of the harness is built using a gutted new TFI module with nine wire leads integrated into it (six tfi plug wires and three signal jumpers). The module is resealed using a custom 3d printed MRM cover (printed using Graphene HIPS plastic).