Loopey
 

Okay, so that's Doug's term for my car's behavior.

But what I'm wondering is if anyone can help me out with a symptom.

While driving along, predominantly at @75mph, the car pitches its nose back and forth. In aviation we call this "yaw". In driving I call it nauseating. Anyway, I've had the car up in the air and looked at all the suspension components and can't find anything amiss. I have also checked differential fluids and all are normal. Also, also the struts seem fine. And lastly the sypmtoms come and go. Unfortunately they come more than go.

Anybody have something like this happen to their SVX? And yes, the tires are inflated properly. Even the spare has air:D

Any help is appreciated.

There's a variety of things that can cause 'yaw', dually tire ruts are the most common, as a car's track rarely fits them. As the tires track in and out of them the car becomes unsettled. Another possibility is 'creeping' the kind of sick, small swerve to one side and then back when changing lanes. It's caused by tires and some tire/car combinations. Sometimes inflation adjustment will help. Some roads were paved/repaved with the lane seams close to the normal tire path and make this more noticeable.

Have you tried rotating your tires, straight front to back? You may have the beginnings of a tire separation. I'm assuming all four tires are the same manufacturer and size and tread wear.

If this doesn't point you in the right direction, let me know and I'll give you some more ideas.

2 thoughts
 

I had two things come to mind when you described what it is doing. First, how's the alignment? Second, it may be a problem with the tires, but this is much more unlikely.
Jay

Yaw
 

Thanks guys.

But I don't know. I could rotate the tires as it would be cheap and easy (I like cheap and easy, just don't tell the spouse :D ) but the problem seems more severe some days than others and for a couple of days was completely gone. This doesn't sound like alignment or tire issues. Or road surface as I travel the same route daily. Do you suppose it would be possible for a rear brake to drag and cause the rear diff to become upset? If I go to rotate the tires I might take apart the rear brake assemblies and see if anything is amiss in there. I'm open to any and all possibilities so let me know of any thoughts you might have and I'll start investigating.

Thanks a bunch.