I have a 95 SE with series II engine but not sure what model of tranny. Anyway, recently the transmission seams like it will not down shift out of overdrive when you press on the accelerator. The car starts jerking repetedly like its trying to downshift but it never completely shifts. The car drives fine around town around 30-40mph but cannot use cruise control on a hilly highway. Any insight as to what may be the problem would be greatly appreciated.

When you think it should be shifting out of overdrive, have you tried manually forcing it out of overdrive?

-Jeff

Teuobk, no I haven't tried to shift into drive when it does but i will try that to try to narrow it down some more. The way I get it to downshift is push the accelerator to the floor where it downshifts properly and does not jerk. It seams to do it when I am going up a hill on the highway and first the torque converter should unlock and your rpm'* go up then if that is not enough the car should downshift to the next lower gear to maintain your current speed. That is the way it used to operate. However when driving in town at the 30-40 mph speeds the car does this just fine. It only does it on the highway when the car is in overdrive. Csprague has your car done this for a long time. This just started happening and 87,000 miles for me. Just wondering and thanks for the replies.

*cough* rebuilt *cough*

i had the similar problem with an 88 SSE.. had to depress the gas twice to unlock the converter.. that was strange.. if it is jolting going up hills.. you may need to change out your O2 Sensor, and.. check your ignition coils.. i had to do that with both of my Bonnevilles.. i currently have a 95-ssei, with enough new parts on it to call it a new car.. including a new transmission after 88k miles.. when it jolted up hill, the O2 sensor was the problem.. my new Xmission works perfectly, no problems what so ever.. you may have a transmission flaw, but, if you haven't checked the sensor and coil, i would do that... Good Luck..!!

<font size=-1>[ This Message was edited by: craigpr on 2002-03-14 14:37 ]</font>

craigpr,

Did you have a error code that told you that the o2 sensor was bad or what pointed you in that direction.

Kressdog: no.. not that i remember.. on the 95ssei, the SES light came on when it started jolting/missing up hills in OD.. the O2 sensor replacement fixed that.. and your problem seems consistant with the 88 sse I had.. letting up and depressing the gas the 2nd time would allow it to unlock the TC.. but.. it still would jolt now and then, even in town.. i think the supercharged models have a different Xmission.. good luck..

<font size=-1>[ This Message was edited by: craigpr on 2002-03-15 12:49 ]</font>

Strange that this should happen to me at the sam etime of this post...
coming home from school today i was going about 100 (km, not MILES...) and let off....going up a hill because it was 50 on the other side. anyway when the car hit 90, it gave 2 little jerks...you probably wouldn't even notice them unless you drove the car every day like me. I tried it again, and it did it again. It almost feels like a back fire, but of course it'* so where near severe, and it dosn't seem bad enough to be a tranny slip...plus no light comes on. ??

Greg

The car is still running great. As to how to tell which pack may be weak I had my brother who is a mechanic fix the car and i'm not sure how he knew which one to replace. I'm sure that there is a test that someone knows about. The next time I see my brother I'll ask him how he did it and report back.

I love cheap fixes.