deusexaethera
12-18-2008, 09:43 AM
First of all: Quarter million mile crew checking in. :rck:
My 1995 Voyager has 283000 miles on the clock. It still has the original engine (3.0L) with no rebuilds (still passes emissions too!), and it's on its second transmission. Sometime earlier this year it started exhibiting the weird and more-than-slightly suicidal behavior of trying to shift into 1st gear on the highway. It's not just downshifting a gear or two -- I had that problem, and it was cured by replacing the throttle position sensor. I thought maybe it was the transmission speed sensors (input and output) that were causing problems this time, because why else would it try to shift into 1st unless it thought the car was stopped, right? Well, replacing those sensors made the engine feel like I'd shaved 1000lbs off the weight of the car (much better pickup), but it still tries to shift into 1st for a split second -- accompanied by a sudden drop in speed, a sudden increase in RPMs, and a nice seatbelt-tightening jerk. (None of that is surprising, of course.)
If the throttle position sensor and input/output speed sensors are all new, what else could be causing this problem? Remember, it's not just downshifting, it's downshifting into 1st gear, regardless of speed.
My 1995 Voyager has 283000 miles on the clock. It still has the original engine (3.0L) with no rebuilds (still passes emissions too!), and it's on its second transmission. Sometime earlier this year it started exhibiting the weird and more-than-slightly suicidal behavior of trying to shift into 1st gear on the highway. It's not just downshifting a gear or two -- I had that problem, and it was cured by replacing the throttle position sensor. I thought maybe it was the transmission speed sensors (input and output) that were causing problems this time, because why else would it try to shift into 1st unless it thought the car was stopped, right? Well, replacing those sensors made the engine feel like I'd shaved 1000lbs off the weight of the car (much better pickup), but it still tries to shift into 1st for a split second -- accompanied by a sudden drop in speed, a sudden increase in RPMs, and a nice seatbelt-tightening jerk. (None of that is surprising, of course.)
If the throttle position sensor and input/output speed sensors are all new, what else could be causing this problem? Remember, it's not just downshifting, it's downshifting into 1st gear, regardless of speed.