I have a 1994 Ford Aerostar. When driving on the freeway at 65mph +/- in overdrive...
The transmission will randomly downshift into drive and stay in that gear...
Sometimes, (after a few minuets) it will then randomly up shift back into OD, but this is rare...
When it downshifts out of OD, nothing I do (use the column to shift into other gears and back, into neutral and back) will make it up shift back into OD when I return to that gear...
Now here is the only thing that works...
When the transmission (randomly) down shifts into drive, I can get it to up shift back into OD, by stepping down on the accelerator, but as soon as I let off slightly, it downshifts again immediately...
To me it feels like it is a vacuum signal issue but I don't know anything about this vehicle/trans characteristics
The transmission will randomly downshift into drive and stay in that gear...
Sometimes, (after a few minuets) it will then randomly up shift back into OD, but this is rare...
When it downshifts out of OD, nothing I do (use the column to shift into other gears and back, into neutral and back) will make it up shift back into OD when I return to that gear...
Now here is the only thing that works...
When the transmission (randomly) down shifts into drive, I can get it to up shift back into OD, by stepping down on the accelerator, but as soon as I let off slightly, it downshifts again immediately...
To me it feels like it is a vacuum signal issue but I don't know anything about this vehicle/trans characteristics
Feb 12, 2014 at 7:40 AM
