On Wednesday, August 10, 2016 at 2:31:23 PM UTC-10, Bill Vanek wrote:
> On Wed, 10 Aug 2016 15:01:08 -0700 (PDT), dsi1 <dsi1yahoo.com>
> wrote:
>
> >On Tuesday, August 9, 2016 at 1:49:28 PM UTC-10, wrote:
> >> dsi1:
> >>
> >> Look up online "2011 Hyundai Sonata wandering" and you'll
> >> understand why the concern. Although most of the issues
> >> were resolved by the third model year of the YF body Sonata,
> >> it is still good to havr alignment checked, especially on a
> >> used one with 30,000 miles.
> >>
> >> Another contributor to the wandering was the electric power
> >> steering and what mode it was set in at the factory. Mine was
> >> set to 'Soft'(maximum boost, minimum driver effort). I had my
> >> dealer set it to 'Sport'(minimum boost, most driver effort needed
> >> to steer car). In soft, even slight changes to the road angle, or
> >> a mild cross wind, would wrest the wheel from drivers' hands!
> >> It was reminiscent of the 70s 'one fingered' steering on
> >> full size models.
> >>
> >>
> >> Sport mode was a huge step in normalizing the handling/road
> >> feel of my Sonata, but I figured finding a way to maximize
> >> caster - within specs - would really ice the cake.
> >
> >Just tell the alignment guy your problem and he'll probably just change the toe-im. I don't know if they'll be in spec but that should improve straight line stability. The young alignment guy might not want to do it so find the oldest, most ornery-looking coot in the shop and ask him. The price you pay will be increased tire wear.
>
> Changing the toe will help only if it's so far off right now that the
> car is wandering back and forth. The only things that affect steering
> return to center are camber, caster, and kingpin inclination.

I believe that the OP is experiencing wandering back and forth.