I took the 'puter out of the Yellow Peril and found it pretty grungy with some
corrosion around the edges. The connector (plug?) seemed good on both sides.
It is an 034 model and I had another one that looked better so I put it in.
Since I had everything possible adjusted as lean as possible it refused to start
and still refused to start until I put on the MAPsensor that had the removable
end plug. I finally got it to idle, first at 400 rpm (not reliably) and then
up to 750, and played with the mixture some. Although the MAPsensor was set fairly rich (unscrewed about 3/4 of its travel), it seemed fairly lean
according to the colortune (blue flame) on both #1 and #2, so both pairs are
apparently triggering OK. Nonetheless the exhaust was still kinda smelly.
I plan to continue tuning but would still welcome more suggestions. One
problem it has is that from idle, when you step on the gas, it stumbles at
first. The contacts are good and clean in the throttle position switch, and
adjusted IAW the manual. It seems like the stumbling happens quicker than the
richer mix from the throttle switch can respond. Any ideas on this, anybody?

Many thanks for all your help on this.
--
George Downs, Bartlesville, Oklahoma, Central US

The following reason makes absolutely no sense at all, but all I know is that for some inexplicable reason it worked on my B30E after years of enduring the dreaded acceleration staggers. Bore a hole through the end of the aluminium plug which you removed from the map sensor just big enough to get a screwdriver through it to turn the mixture screw when the plug is screwed back into the sensor. Screw the plug back into the sensor until its inner lip just contacts the diaphragm. Screw it in about an eighth of a turn further. See if that helps. You will have to experiment with the position, in or out. If it helps, once you've found the optimum position seal the plug with a dab of silcone or Locktite. Haven't a clue why it worked and there's no reasonable explanantion to why that I can think of, but it did the trick on our 164. Unless it was just coincidence, karma, kismet, or some other supernatural force at work.

George. My book lists rich mixture as high trigger contact resistance, renew contacts. and faulty pressure sensor. replace sensor. Hope this helps, Jack.