I'm putting a basket case back together, and I have the option of
installing a complete cooling system hookup, that is, water pump, all
accessory fittings, hoses, etc. for either a pre or post '86 style
system.  It really looks to me as if the early system has fewer small
pieces, and/or fittings, whether plastic or metal.  This makes me
question whether to install the later style system.  I especially don't
like the sealing for the temperature sensor that runs the injection in
the later system, with its o-ring and retaining ring/spring clip.

I'm wondering just what improvements the later system were supposed to
have made over the earlier system.  Who can expound on this for the
group.

I run both types in my vehicles, and have never experienced any real
difference in on the road performance.

For that matter, is the later fuel injection really better?  Experience
would suggest that the earlier units run cooler, and with fewer
breakdowns.  I believe some European 2.1 engines came with the earlier
system.  I think Per Lindgren has one like this, and has said the
performance is great.  Not having the ignition mapped on a chip isn't
such a bad thing.  The 2.1 engine has more trouble with "pinging" in the
real world, I believe, than the 1.9.  Hmmmm.

Chuck Hill