Hello,
To start off I love this car, Its a 2000 catera that I bought about 2months ago and since I've noticed

1. the car drives around 20 mph (take-off & stop) the car makes a wierd wump* wump* wump* kind of like a friction noise.

2. when i move from one lane to another and the road is uneven the car will kinda pull hard to one direction, like something is loose??

Any idea guys?? thanx

1. the car drives around 20 mph (take-off & stop) the car makes a wierd wump* wump* wump* kind of like a friction noise.


i get that when my sunroof is open and the windows are closed. some sort of harmonic w/ air pressure interaction.


2. when i move from one lane to another and the road is uneven the car will kinda pull hard to one direction, like something is loose??


it's called "tramlining"...a wandering/darting behaviour when moving across longitudinal ridges or troughs in the road. apparently it's something that the catera front-end is pre-disposed to experience. search the archives for "tramlining" or "wandering" or "darting".

so your saying the that the underdrive pulley is worn out or something?? also i dont have a sunroof.

Now just my two cents here but alot of people have had the front bushing go out on the control arms also I think if I remember right the lower ball joint will also bad so jack the car up and check out these items won't you any thing just to inspect these.