See this thread:
viewtopic.php?f=26&t=35034" onclick="window.open(this.href);return false;
Even though you did not report the 2009-10 rattle, I am concerned because of info from the above thread regarding the steering.
Here is a pertinent excerpt from XRVibe10, who works for a dealership:
When the Steering Column is replaced on the Vibes, the PSCM (Power Steering Control Module) has to be recalibrated for angle, position, & torque (the sensors that is) its all done through the Scan tool and makes sure the module has the correct values for the newly installed column - if it wasn't recalibrated it make read the old values & be trying to correct for it being out (i.e: your wheel is straight but it thinks your steering 8 degrees to the left & the assist is wanting to help return you to center)
this could be a cause of your vibration & could get worse @ higher speeds like you mentioned - take it back & get it fixed - Also, don't know if you hand any other work done (brakes, tires, etc) ie: make sure the wheels are tight as well if you had any other related work
Anyway, this makes me think we must have drive by wire steering - where there is no mechanical link from steering wheel to your front wheels. If your steering problems are not related to ruts in the road (in the past I had a front wheel drive car and I put on wider, lower profile tires and this made the car swerve a lot as it followed road imperfections, especially under acceleration) I wonder if your PSCM is failing or shorting out.
1997 Civic EX sedan w/auto trans2001 Accord EX sedan w/5-spd manual2009 Vibe 2.4L w/5-spd manual, sunroof, monsoon, GT spoiler, Magnaflow muffler and rolled SS tip, lowered on H-Tech springs, window tint, debadged (save the red arrow!).