Going out on a limb here.....
http://www.autohausaz.com/index.html
According to this site there were three different Hall Sensors/Senders used between 83 and 85. By their listing the round plug sensor was for the white cap distributor only. Bosch has 2 different ones depending on the 10 or 14mm shaft (both with rectangular plugs). The newer distributors have the thicker shafts if I am not mistaken.
Questions:
1. What is the diameter of the shaft of the white cap distributor?
2. If a newer distributor (with a thicker shaft) is installed in an older block, what are the chances that the drive gear on the bottom would be slightly different than that on the thinner shaft?
3. Could such a difference cause the timing to not be steady thus making the hall sensor wonder WTF?
4. Would the distributor and intermediate shaft possibly need to be mated from the same model engine?
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Harold Thompson '84 245 Virgos
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