![]() The Hall sensor connector is also mounted in the distributor and is reponsible for transmitting magnetic pulses to the TFI module indicated crank location. The Hall Sensor is mounted inside the distributor and its bound by the distributor shaft and octane sensor. Where is the TFI mounted? Its mounted on front of the distributor and plugs into the EFI harness from the computer and connected to the Hall Sensor on the distributor end. I have found the A2A module results in more response to light throttle, while the A1A kicks some tail on top end. ![]() Interesting, huh? It is my belief that since the resistance is applied to the hall sensor's measurement of position, this would most likely affect ignition timing artificially. The difference was around 0.11kohms, orġ10ohms. Both A1As measured exact resistances, as well as the A2As. By the way, I have tested 4 different TFI modules. As you can see below, the ohm resistance is different between the two. No, they are not lot numbers as many have thought. Also, a different feel to power production too. ![]() The Hall sensor cost around $40.00, but requires a press to remove and install the cam gear. Estimated cost for a TFI Module is $100.00, plus you will need a 7/32" distributor tool illustrated below. The A1A (top) and A2A (bottom) Thick Film Ignition (TFI) Modules. INSPECTING THE TFI MODULE and Hall Sensor The post below is from a web page that has a dead link and I can not find it on the net anymore.
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