Is it on concrete highway with grooves cut into the concrete ?
Could be "tramlining" caused by a combination of the grooves and "tires".
Does it ever do it on Tar roads ?

 

He brings up a good point. My daily commute involves both standard asphalt roads and concrete roads at similar speed. There is a very noticeable difference in drive-ability (worsening) when travelling on the concrete.

 

What I've noticed is that if the road is starting to get slightly rutted from traffic and my car is in the groove - it drives fine. But if I drift a little to the left where I start climbing the side of the rut - the car makes an abrupt left turn (pulls pretty hard on the steering). Happens in the other direction, too.

And this has been going on before and after I had the steering wander TSB applied. I'm not sure what's going on, but it can be quite unnerving if you aren't ready for it.

 

Same thing here ...could it be the electronic steering assist over compensating for uneven road surfaces. Very strange if ur not ready for the sudden pull to the left or right like you mentioned.
Is there a way to disable the steer assist and see if that makes a difference?

 

Certainly worth a trip to the dealer but before you do that check the tire pressure (if you haven't already done so). Ford suggests 35 psi all around - big variations from that, particularly if the fronts are different side to side, could be making things worse.

 

do you have a rear sway bar? are your tires properly inflated and balanced?

 

Check out my post... Do have the sport wheels?
http://www.focusfanatics.com/forum/showthread.php?t=273753

 

I drive on grooved concrete highway every day and have not had this issue, I have the SE sport with stock sport wheels and Continental tires. Hope that helps!

 

For those asking, I have the Titanium Handling Package with the 18' wheels, and they are all at the proper tire pressure.

Is the dealership just going to end up replacing my tires?

 

I have been going thru the same issue since I picked up my Titanium with the 18's. I have 16k on my Focus. Lots of Vegas trips and back and forth to AZ quite a bit. I am almost used to it. But when its time to get tires, Im done with those Michelin's. I want to get some new wheels anyway. [giddy]

 

That's the problem. I found this out later. Ford uses a great tires on the sport wheels. The problem is they didn't want to put the usual 225-35 tire. Very thin, but great for handling. The 235-40 ford uses is your problem.

The swaying only happens to me when the road is uneven. I take the same route everyday and it happens in the same area. Lol. I jumped the gun on my post. Oh well! I kept the tires and deal with it. The roads aren't bad here in Tampa. it hasn't been scary swaying as you say. Roads must be sh!y there???

 

Hi, you referring to the Michelin PS3 235-4's? If so you are incorrect, there is no tramlining I have ever experienced with those tyres. Some tyres can cause it at speeds below 50, such as the Conti's, I suggest having the tracking checked..
Chris

 

I've had my SE up to the limiter on the Autobahn with zero swaying, 16" painted pocket wheels FTW!
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Big diffrence !!! Lol make a trip to the US. We're talking about 18" sport wheels anyway

 

Yes-me too!! It's only on grooved highways. It's like quick wiggling fron side to side. I have the 18" wheels and was curious if that might be the issue. I have over 9000 miles on it since I purchased it in mid September 2011 - so it doesn't feel "dangerous". It's just another quirk that gives it personality. If it gets worse or it causes me to sway out of my lane - well that's another story.