hall sensor on a '85 4kq? (5 window type?)

[JShadzi at aol.com]

<< Now I'm wondering how the stock 4kq hall sensor works.  I know
 the hot ticket for some EFI conversions are to use the NF/NG
 ignition system, which has a 5 window hall sensor.  Is this is the
 case with the 4kq as well?>>

Yes, basically the same distributor save for the vacuum advance

<< I remember the NF/NG system is preferred over the 4kq system,
 but that's because of the knock sensor. >>

That's not the only reason.  The CIS3 uses ignition maps based on load, which
the 4kq does not do, just a fixed retard per RPM.  Because of this the CIS3
system can advance or retard timing within the curve based on load, a very
nice feature.  Similar to the MC ingnition system.

Javad