I just purchased a 2007 RDX with the tech package this last week. The car has 45000 miles on it and I noticed today (3 different times) that it jerked or stuttered while cruising at highway speeds. (63 mph) I did notice that it happened at low rpms on a level surface and that I had not noticed it before as it was pretty obvious.

I am sure that I put 91 octane in the two times I have filled it up but it seems as though it could still be a fuel issue. Has anyone else experienced this?

 

There are many things it could be, but you are correct in addressing fuel first. It's less likely to be the octane and more likely water or contaminants in the fuel. Get a bottle of Dri-Gas or Heet, put in half and then fill the tank with quality fuel; 91 or higher of course. (Don't use that previous station.) Run the tank down halfway or more and then put in the rest of the gas dryer and fill it again.

We recently took care of fuel contamination in my mother-in-law's car this way (dealer estimated $300 to check it).

A dirty air filter can also cause noticable stuttering in the RDX, but most often under acceleration, when the air demand is high.

Take your VIN to a Honda/Acura dealer and they should be able to pull up the maintenance history; if it was serviced at dealerships. See if any hesitation reports show up, or unexpected fuel/air/ignition work was done.

 

Thanks for the idea. I will try this today and hopefully get some results. My wife and I really like the car so we hope it's not any big problem.

 

First off have a qualified mechanic diagnose the issue. Take it back where you bought it. Most reputable lots (dealer or not) will work with you for the sake of good customer relations. At the least you might get them to pay for that crap that the guy above (from PA not Hawaii) is suggesting you put in your tank. The proper way to deal with a contaminant in the fuel system is to remove the tank and have it cleaned, as well as Remove & Replace any effected componants (if that is what is wrong with the car).