Hello all; I have a '90 Econoline with a 5.8 and E4OD electronic transmission. I've owned this truck since new (best and most trouble free vehicle I ever owned, I might add) and it still runs that way. One little thing that has always irritated me is the programmed transmission downshift points. In normal driving as I increase throttle it won't downshift until the manifold vacuum is so low the engine sometimes pings. Of course by mashing the gas past the "ping" it shifts fine but then I'm accelerating a little too fast. An aftermarket MAP sensor helped the problem slightly (put it in not long after I bought the van). I don't really want to spend the money (I think they were around $400) on those aftermarket "transmission computers". Anyone know of another "electronic" way of tricking the computer into thinking that possibly the manifold vacuum is slightly lower or some other way to get downshifts with slightly less throttle?
Jim