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[Mr 5 0]

91PA5liter:

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.

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. The TFI module is a very necessary component of the entire EEC-IV engine management system.

Depending upon the engine, the module is usually found on the distributor itself, on the front of the engine