1988 celebrity not down shifting

08-18-2007, 07:31 PM
Vehicles not down shifting all the time, from 3rd to second gear. vehicle only has 102k.

08-20-2007, 02:28 PM
May not be the same electronic transmission as the Chevy in this link, but it is probably time to take it to a garage. Don't worry, it is not always a serious problem. Let us know what you find out.


09-13-2007, 02:06 PM
Most likely your downshifting problem is a bad vacuum modulator, or a bad vacuum supply line to it. If it will downshift manually, then the modulator valve/vacuum leak is the issue.

12-12-2007, 06:29 PM
Just wanted to ask if the 3-2 downshift was the only symptom you noticed? Is the trans showing any other differences? Also, I believe you said it wasn't downshifting all the time. Sometimes it works properly? If not all the time is there a pattern such as " works cold and not hot" or the other way around?

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