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Tranmission Surging When Coming To Stop
Posted September 15, 2004 at 10:11 am
My 94 GV when coming to a stop will surge or jump when shifting down to first. I don't know if this is the famous "bump shift". I changed and flushed the fluid (ATF 3) and didn't see any improvement. Any thing else I should take a look at ? Do I need to have the TCU reset?
Posted September 15, 2004 at 02:18 pm
Posted September 15, 2004 at 04:37 pm
The Throttle Position Sensor on the throttle body can cause this. The TPS sends a signal to the transmission on when and how hard to shift. If it is worn out, the tranny may think you want to accelerate when you actually want to stop. About $20. It has been revised since your van was built.
Also, I hope you have a revised TCM (tranny control module). Check for stickers with dates on it. The TCM is a rectangular box on the passenger side firewall with a large multi-wire connector on it. The new software improves the shifting and longevity of the tranny and stops the bump stop. Dealer may be able to reprogram but look for a used one such as on EBAY.
Try cheap simple fixes before you go to a shop. They always say you need a new transmission.
Edited by malcom, September 15, 2004 at 04:38 pm.