2000 Park Avenue Bucking BAD when shifts

kbogart555 · 06-25-2008, 10:44 AM

A few weeks ago I noticed the car "jumping" or "bouncing" while on the interstate. (high speeds only 65-70mph).
Then I didn't notice it anymore and my service engine soon came on. (about a week of the bouncing).
This morning, once I got on the interstate it would buck everytime it shifted gears. and I mean not a slight buck but the kind that would throw you out of the window. In addition there is a humming while excilerating. It's not loud - but I can hear it loud and clear.

Is it the transmission? easy fix? expensive fix?

This car has always been in tip top shape maintenance wise and this is my first experience with ANY problems.
HELP!!!!!!!!!!!!!!!!!!!!!!

GMfan1111 · 06-25-2008, 01:21 PM

could be but first can you give a bit more info please Is your park avenue a base model with the normal 3.8 liter? or is it a supercharged ultra model? The ultras use a slightly different tranny than the non supercharged models.

kbogart555 · 06-25-2008, 01:58 PM

No it's not an ultra.

SierraGS · 06-28-2008, 09:55 PM

Could be the TPS (Throttle Position Sensor).

They don't cost much and are only held on by a few screws.

Make sure there are no loose/cracked vacuum hoses and the PCV hose is OK too.

06-25-2008, 10:44 AM	#1 (permalink)
kbogart555 Walking Join Date: Jun 2008 Posts: 5	2000 Park Avenue Bucking BAD when shifts A few weeks ago I noticed the car "jumping" or "bouncing" while on the interstate. (high speeds only 65-70mph). Then I didn't notice it anymore and my service engine soon came on. (about a week of the bouncing). This morning, once I got on the interstate it would buck everytime it shifted gears. and I mean not a slight buck but the kind that would throw you out of the window. In addition there is a humming while excilerating. It's not loud - but I can hear it loud and clear. Is it the transmission? easy fix? expensive fix? This car has always been in tip top shape maintenance wise and this is my first experience with ANY problems. HELP!!!!!!!!!!!!!!!!!!!!!!

06-25-2008, 01:21 PM	#2 (permalink)
GMfan1111 6.0 Liter Vortec V8 Join Date: Oct 2006 Location: in a undisclosed location somewhere in the metro detroit area Drives: 2001 Chevy Malibu LS Posts: 1,605	Re: 2000 Park Avenue Bucking BAD when shifts could be but first can you give a bit more info please Is your park avenue a base model with the normal 3.8 liter? or is it a supercharged ultra model? The ultras use a slightly different tranny than the non supercharged models. __________________ The 100 Mpg Prius is Vaporware “The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at or repair” "A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools". - Douglas Adams - Current ride: 2001 Chevy Malibu LS (happy 95,000 miles )

06-25-2008, 01:58 PM	#3 (permalink)
kbogart555 Walking Join Date: Jun 2008 Posts: 5	Re: 2000 Park Avenue Bucking BAD when shifts No it's not an ultra.

06-28-2008, 09:55 PM	#4 (permalink)
SierraGS 3.6 Liter V6 Join Date: Feb 2007 Location: SoCal Drives: '04 Sierra '02 Regal GS "05 PT Cruiser Posts: 1,105	Re: 2000 Park Avenue Bucking BAD when shifts Could be the TPS (Throttle Position Sensor). They don't cost much and are only held on by a few screws. Make sure there are no loose/cracked vacuum hoses and the PCV hose is OK too.

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