'90 Distributor Reference Signal
What do you think the signal looks like that is fed back to the ECM from the distributor module? Basically, the magnetic pickup ring connects to the distributor module... but what is fed back from there? Is it a 5vdc on/off square waveform or ??
The problem is that the car exhibits spark scatter throughout the rpm range only under part throttle. If I'm into the pedal hard-- it is fine. The cap, rotor, wires, module, reluctor ring and pickup have all been replaced. In the base timing mode with the EST connector "open" the car will also run fine. So, my theory is that the reference signal that is fed back to the ECM is goofed up.
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Linear Mode
