EE question...D-Jet related Options

[Mueller]

What I want to do is have 1 12vdc square wave input, with a "splitter" that will alternate between 2 outputs, I want to do this electronically, and not with a Hall type sensor going high or low to reset

[pbanders]

not sure if the ECU cares about dwell or not, it could be as simple as on/off, same as the L-Jet, as long as there is a voltage differantial, the trigger works

Maybe, maybe not. The whole D-Jet system is basically too clever by half, and obvious designed by someone who knew analog voodoo much better than I do (which ain't hard).

Without a good scope and lots of time, there's no real way to know. I'd think that you'd be right, and simple pulses would work. Only the frequency really matters. However, I'd also not expect the MPS to work the way it does, either.

The square wave generator and inverter idea might work. Feed the input square wave into a divide-by-two frequency divider (crib circuit from one of many Radio Shack handbooks), and pass that signal straight to injector pair A, then invert the signal and send that to injector pair B. This assumes the square wave in has a pulse every time a spark fires. Where are you getting the square wave from? If it's the coil trigger, you might have a problem with the flyback voltage, just like the MS tach input.

You might want to look at my analysis of the D-Jetronic ECU:

http://members.rennlist.com/pbanders/ecu.htm

I'm not exactly sure of what Mueller wants to do or why. The trigger contact points are probably one of the more reliable parts of the system, you only need to change them every 100K miles or so. The failure mechanism is usually not the contacts, but the phenolic blocks that ride the cam wearing down so much that disrupt the timing of the two switches and the overlap period.