Regarding BLM Cell, low RPM / high vacuum fuel, and information from the internet...
There are lots of theories on the number of universes that exist. The number ranges from one to infinity - most physicists lean toward the infinite number, which, by the way, suggests that there exists somewhere a universe exactly like the one we live in. Furthermore, given what infinity means, there will somewhere be an infinite number of universes exactly like ours. There will also be an infinite number of universes almost like ours, and of course infinite upon infinite numbers of universes very different from ours.
And that makes me wonder...
Somewhere there has to be a universe where there is a guy like me (except that he's rich and understands this stuff) with a Jeep that looks like mine but does not freakin' STINK so much at idle! But according to Max Tegmark (a highly regarded cosmologist) a universe like ours is 10 to the 10th power to the 115th power meters from us. That's a long drive. And the one with the good version of my Jeep is probably on the other end of that one.
That also means that if you encounter information on the internet, the author is infinitely likely to be from a universe where the information he provides does not follow the same laws of physics we know.
So that brings me to my next point...
In our universe, it turns out that the two wire magnetic sensor in the kit I bought does indeed produce an AC signal. I stuck four magnets to a drill chuck and squeezed the trigger. With both leads of a digital VOM connected to the sensor leads, I was able to see an AC voltage. So far so good.
Also, by doing higher math (third grade at least - challenging for me, anyway), I calculated that with my tire size and gear ratio, 1000 revolutions of the drive shaft will get me nearly half a mile, and 2280 revolutions will go exactly a mile. So I have to conclude that one magnet on the drive shaft yoke will give me just over 2000 pulses per mile, close to what the ECM wants. So if my signal converter can convert an AC signal one-to-one to DC like the Dakota rep says, then the problem is solved. I'm going to try that. I will also try the same converter with different settings to utilize the 40 tooth wheel. I would actually prefer using the transfer case wheel since it has to be more solid than a drive shaft bolt-on thing.
And FINALLY to my two real questions...
(1) What can I do to reduce fuel at high vacuum? Would I adjust the VE table in, say, the first four blocks or so - 400 and 800 RPM at 20 and 30 Kpa? I usually can't get BLM readings in at least two of those cells anyway. I would even like to adjust maybe the first two whole columns downward while leaving the others alone - within reason, of course. (Remember, I would like to get this improved prior to my Jeep trip; after that I can take it off the road and work on electronic spark control.)
(2) Where exactly do I find the "BLM Cell" you mention? Do you mean the cells in the BLM History that show up while I'm datalogging, or is there a table in the bin that I can look at to see what the computer is storing as a BLM for that location? If the answer is 'b' I can't seem to find one. If the answer is 'a' my history doesn't have those low cells filled in (especially the 400 RPM ones, which is where I think the adjustment should probably be made). The idea sounds good - please give me a little (or big) hint on where to find the BLM Cell.
Thanks again to all who help - I'm learning a lot and my Jeep is reaping the benefits.
Dan.