What is a TFI module?
The TFI stands for Thick Film Ignition. The module itself consists of some solid state electronic components suspended in a thick, clear electrolytic film, hence the name TFI. What is the TFI module’s function? The TFI module (also known as a spark module) is necessary to control the spark output of the ignition system via the EEC (electronic engine control) computer. A signal from the TFI module is sent to the EEC and the computer then controls the spark to the spark plugs. It is a very necessary and vital component of the entire EEC-IV engine management system. Where is the TFI module located? Depending upon the engine configuration, the module is usually found on the distributor itself, on the front of the motor: ABOVE: This module is located on the side of the distributor. Shown above is a 1986-88 Cougar 5.0 V8 engine. ABOVE: On some cars, the module has been relocated to the front of the radiator core support and is surrounded by an aluminum heat sink. The module above is on a 198
