trans overdive

91 lx auto a/c one day the car go's into overdrove but now it won't go into overdrive it shifts fine the oil is good went to a trany shop thay don't know they put it on a scanner with no luck can you people help me out the car go's on the highway all the time like to keep this car have'n to much fun with it hate to kill this be for it's time

91 lx auto a/c one day the car go's into overdrove but now it won't go into overdrive it shifts fine the oil is good went to a trany shop thay don't know they put it on a scanner with no luck can you people help me out the car go's on the highway all the time like to keep this car have'n to much fun with it hate to kill this be for it's time


Had the same problem. It turned out to be the throttle position sensor. Good Luck