I have owned my Vibe (2004 Base /Automatic) for just shy of a year now, and something that has been bothering me from the start, is the way the vehicle behavior changes when in-gear but off throttle.
There are times when the vehicle rolls very smoothly, like I feel it should. I can get in and start her up, depress the brake and leave park, then let off. She will instantly start rolling at a low speed, it feels very smooth, just like I would expect. This is especially noticed in my parking area, which is on a downward sloping gravel surface (slopes down and towards the house). When the car runs like expected it can pull out of the parking area no problem...
But there are many times where the car will virtually just "sit" there, even on relatively flat surfaces, or will advanced forward at a very slow speed (sometimes the speed increases as motion continues). In situations like this, no amount of getting on/off the brake or shifting in and out of Drive gear seem to have any influence. Also, when this happens I can usually turn the steering wheel left/right and it seems to help the vehicle to get moving (if it is just sitting there).
I've described the problem to my mechanic, although he doesn't seem to be too sure about it either. He did test my front wheels during an oil change a few months ago, and said it seems like the drivers side caliper might be sticking. So at that point I took it in to him (good thing) to have the brakes looked at, and calipers cleaned, etc. He said the front pads looked pretty good and didn't look like they were wearing unevenly, so he ended up just replacing my rear drum shoes (which were almost gone, hehe).
I have personally seen the behavior change while driving. It becomes apparent when the car "loosens up" when rolling up to corners and stop signs and then letting off the brakes, etc. Otherwise, in comparison it FEELS like something is slowing the car down, or introducing some kind of drag, but it doesn't seem to be pointing at stuck calipers or anything? I asked my mechanic if it could be something weird like the transmission, but he said no. I also asked if the rear shoes could be sticking or something, but again he didn't seem to think so.
I'm kind of out of ideas but this is really bugging me.. Could it be a bad bearing, or poor lubrication? Does anyone have ideas on stuff I could have checked out? Its annoying for sure, but I'm also worried about long term mechanical implications as far as damage to parts etc might go. I suppose if one of the calipers still are sticking (even after they'd been cleaned?) it could possibly mean both actually are, and that would explain "even" looking pad wear? The parking brake appears to function normally and I don't believe it is involved in the issue, but I've never asked him to check it either (I would assume he would have after replacing my rear shoes?)
2004 Base Automatic