Wanted: Information on the Motorola MC3484 series FI driver

[kleenair at ix.netcom.com]

Ben Wong wrote:
> 
> Hi,
> 
> >I'm jumping in the middle of this (haven't tracked this specific
> >conversation), but if you are trying to read RPM from coil signals on a
> >two coil system, another way is to use two diodes to connect the two
> >signals together.  If you put the diodes in right, the resulting signal
> >is the combination of the signals to each coil and the output should be
> >your desired signal.
> >
> >Best Regards, Mazda
> >
> >
> Just wondering..does this theory applies to a vehicle that has individual
> coil for each spark plug? I'm trying to hook up a dash mounted tacho but my
> current wiring is only going to one coil and this gives an erratic reading!
> By the way it is a Nissan 200SX (Turbo)- CA18DET ECCS engine.
> 
> Thanks everyone.


It should.  I applied this to a 4 cylinder two coil GM engine.  The 
principal is to combine the pulses without allowing any pulses from other 
coils to feedback into each coil.

Best Regards, Mazda