System Description

Thick Film Integrated (TFI) IV ignition system (Typical):

With the exception of the Distributorless Ignition System, TFI -IV (Federal) and TFI-IV w/Computer Control Dwell (Calif.) is used on all other EEC IV controlled engines. The distributor is die cast unit that is gear driven. A Hall Effect stator assembly is used to trigger the ignition coil. This system does not use either centrifugal or vacuum advance mechanisms. The TFI ignition module is mounted to the side of the distributor base.

Open Bowl Distributor:

The distributor uses the Hall Effect switch to switch primary voltage and send a signal, Profile Ignition Pickup (PIP), to the ECA. The ECA uses the PIP input to produce an output signal, (SPOUT), that is sent to the ignition module to switch ON and Off current in the primary voltage.
This interruption of the primary current causes the ignition coil secondary to produce an open circuit high voltage as high as 40,000 volts. The high voltage pulses are sent to the distributor which sends them to fire the spark plugs.
The ignition module used on manual transmission models has a "push start" feature. If necessary the vehicle can be pushed started.
A provision for fixed octane adjustment by use of a rod is also available.