2005 SV6 Vibration

[NateNBeckie]

Well, as far as the lemon law goes, I think it's too soon. It's a newly designed vehicle, and we totally expected to have buggy problems. We completely expected the issues we have to not get fixed so soon. It usually takes the auto makers a while to figure these things out and release a TSB on them. Why they can't figure this stuff out BEFORE they release a new vehicle, I have never been able to figure that out.

The problems aren't making it undrivable. They're just annoyances. I haven't had the time to get it to the dealer for all this stuff, and I need the van because it's our family vehicle.

As for the jerkiness at idle at a light, it's hard to tell. It's not really jerking, it's more of a shake than anything. If you notice, when you're sitting at a light with your foot on the brake, it idles at ~600 RPM. When you let your foot off the brake, it idles up to about 800 RPM, and that's when it starts the jerking. If you let it roll for a little bit and gain a couple of MPH, it stops. One thing I have noticed is the engine mounts seem to be a little "sloppy." Meaning, they made them so soft to avoid NVH, they might actually be too soft. What I'm getting at, is when it kicks up the RPMs to start a roll, just the drag from the vehicle on the drivetrain makes it shake a little in the mounts. It's definately not a brake or suspension problem. I've driven enough cars and torn down and rebuilt enough cars to know the feeling, and this simply feels like drivetrain movement in the mounts.

Just a theory.

As for the rest of the problems, I haven't figured those out yet.

Nate

[1999montana]

Guess what, our 1999 Montana has this problem too, but it has never gotten worse than as described within this text.

I don't know if this is the root cause, but many modern transmissions exhibit a condition or symptom called 'chuggle' when the torque converter fails to un-lock properly at low speeds. It ‘feels’ like a misfire, but goes away once the vehicle shifts to a higher gear. May be most noticeable if creeping in a parking lot at about 1000 to 1200 RPM.

It can become extremely exaggerated (ours hasn’t yet) and result in stalling when shifting from park into gear for instance.

Another way the vehicle may exhibit this symptom is in coming off a highway off ramp to a full stop; the torque converter may not un-lock and the vehicle will stall due to the direct load applied by the transmission on the engine.