April 30, 2010
If I remember right there`s really only two common reasons for this...
(1) The most common cause by far is that the TFI probably died. Aftermarket ones are commonly shipped without any thermal contact grease to put between the distributor body and the TFI. So, the TFI overheats (pretty quickly), cooks itself, and dies. The original TFI eventually dies from heat too, but it takes a lot longer if the thermal grease (the white stuff) helps it dissipate heat through the distributor body.
(2) The thing that causes the PIP signal dies. The PIP signal is the square wave (with one different length pulse for cylinder 1) that tells the TFI when to generate a high voltage spark. There`s a toothed wheel inside the distributor, and a hall effect sensor that senses the teeth to generate the square wave. If the hall effect sensor dies... no spark.
One of these two things is 99% likely to be your problem.
If it`s that other 1%... I would guess that something on your EEC-IV died, and you need to swap in a new computer.
The TFI is the most likely to fail and the easiest to swap. Try that first, even if you just too a used one on there to see if it makes a difference. If it works, you can go buy a new one to use.