Sorry about all the heat here lately, as I don't really like causing tension (although, I seem to have here). But it was (and is) my understanding that Ford EEC-V still uses the WOT strategy that uses only pre-set (open loop) lookup tables for A/F ratio at WOT, and does not use fuel trim during that time. And that fuel trim (adaptive) compensation was only brought into part throttle and idle strategies during times when O2s weren't able to generate sufficient reliable closed loop feedback. That would make fuel be richer at part throttle (w/ FPR vac line disconnected) until closed loop O2 feedback was able to trim the fuel back to compensate, but then air/fuel ratio would still be normal at WOT. But I'm in left field so that must be wrong.
