wont shift gears form low on 1990 Mercury Grand Marquis

this is the second tranny i am putting in it will not shift form low gear when driving there is no modulator on it but i have changed the speed control sensor i was told there may be a computer somewhere that controls the shifts if so where if not what controls the shifting it has a 5.0l eng. and a aod tranny automatic

by in Pittsburgh, PA on September 24, 2009
2 answers
ANSWER by on September 24, 2009
check your map sensor. some of those years have a maf for the engine & a map for the tranny. if no map, clean the maf because the map in later years is computed from maf.
ANSWER by on April 28, 2010
My shift gear is hard to move. I have an automatic transmission. What could this be?

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